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Diffstat (limited to '')
| -rw-r--r-- | src/fold.c | 3608 |
1 files changed, 3608 insertions, 0 deletions
diff --git a/src/fold.c b/src/fold.c new file mode 100644 index 0000000..7446f7c --- /dev/null +++ b/src/fold.c @@ -0,0 +1,3608 @@ +/* vi:set ts=8 sts=4 sw=4 noet: + * vim600:fdm=marker fdl=1 fdc=3: + * + * VIM - Vi IMproved by Bram Moolenaar + * + * Do ":help uganda" in Vim to read copying and usage conditions. + * Do ":help credits" in Vim to see a list of people who contributed. + * See README.txt for an overview of the Vim source code. + */ + +/* + * fold.c: code for folding + */ + +#include "vim.h" + +#if defined(FEAT_FOLDING) || defined(PROTO) + +/* local declarations. {{{1 */ +/* typedef fold_T {{{2 */ +/* + * The toplevel folds for each window are stored in the w_folds growarray. + * Each toplevel fold can contain an array of second level folds in the + * fd_nested growarray. + * The info stored in both growarrays is the same: An array of fold_T. + */ +typedef struct +{ + linenr_T fd_top; /* first line of fold; for nested fold + * relative to parent */ + linenr_T fd_len; /* number of lines in the fold */ + garray_T fd_nested; /* array of nested folds */ + char fd_flags; /* see below */ + char fd_small; /* TRUE, FALSE or MAYBE: fold smaller than + 'foldminlines'; MAYBE applies to nested + folds too */ +} fold_T; + +#define FD_OPEN 0 /* fold is open (nested ones can be closed) */ +#define FD_CLOSED 1 /* fold is closed */ +#define FD_LEVEL 2 /* depends on 'foldlevel' (nested folds too) */ + +#define MAX_LEVEL 20 /* maximum fold depth */ + +/* static functions {{{2 */ +static void newFoldLevelWin(win_T *wp); +static int checkCloseRec(garray_T *gap, linenr_T lnum, int level); +static int foldFind(garray_T *gap, linenr_T lnum, fold_T **fpp); +static int foldLevelWin(win_T *wp, linenr_T lnum); +static void checkupdate(win_T *wp); +static void setFoldRepeat(linenr_T lnum, long count, int do_open); +static linenr_T setManualFold(linenr_T lnum, int opening, int recurse, int *donep); +static linenr_T setManualFoldWin(win_T *wp, linenr_T lnum, int opening, int recurse, int *donep); +static void foldOpenNested(fold_T *fpr); +static void deleteFoldEntry(garray_T *gap, int idx, int recursive); +static void foldMarkAdjustRecurse(garray_T *gap, linenr_T line1, linenr_T line2, long amount, long amount_after); +static int getDeepestNestingRecurse(garray_T *gap); +static int check_closed(win_T *win, fold_T *fp, int *use_levelp, int level, int *maybe_smallp, linenr_T lnum_off); +static void checkSmall(win_T *wp, fold_T *fp, linenr_T lnum_off); +static void setSmallMaybe(garray_T *gap); +static void foldCreateMarkers(linenr_T start, linenr_T end); +static void foldAddMarker(linenr_T lnum, char_u *marker, int markerlen); +static void deleteFoldMarkers(fold_T *fp, int recursive, linenr_T lnum_off); +static void foldDelMarker(linenr_T lnum, char_u *marker, int markerlen); +static void foldUpdateIEMS(win_T *wp, linenr_T top, linenr_T bot); +static void parseMarker(win_T *wp); + +static char *e_nofold = N_("E490: No fold found"); + +/* + * While updating the folds lines between invalid_top and invalid_bot have an + * undefined fold level. Only used for the window currently being updated. + */ +static linenr_T invalid_top = (linenr_T)0; +static linenr_T invalid_bot = (linenr_T)0; + +/* + * When using 'foldexpr' we sometimes get the level of the next line, which + * calls foldlevel() to get the level of the current line, which hasn't been + * stored yet. To get around this chicken-egg problem the level of the + * previous line is stored here when available. prev_lnum is zero when the + * level is not available. + */ +static linenr_T prev_lnum = 0; +static int prev_lnum_lvl = -1; + +/* Flags used for "done" argument of setManualFold. */ +#define DONE_NOTHING 0 +#define DONE_ACTION 1 /* did close or open a fold */ +#define DONE_FOLD 2 /* did find a fold */ + +static int foldstartmarkerlen; +static char_u *foldendmarker; +static int foldendmarkerlen; + +/* Exported folding functions. {{{1 */ +/* copyFoldingState() {{{2 */ + +/* + * Copy that folding state from window "wp_from" to window "wp_to". + */ + void +copyFoldingState(win_T *wp_from, win_T *wp_to) +{ + wp_to->w_fold_manual = wp_from->w_fold_manual; + wp_to->w_foldinvalid = wp_from->w_foldinvalid; + cloneFoldGrowArray(&wp_from->w_folds, &wp_to->w_folds); +} + +/* hasAnyFolding() {{{2 */ +/* + * Return TRUE if there may be folded lines in the current window. + */ + int +hasAnyFolding(win_T *win) +{ + /* very simple now, but can become more complex later */ + return (win->w_p_fen + && (!foldmethodIsManual(win) || win->w_folds.ga_len > 0)); +} + +/* hasFolding() {{{2 */ +/* + * Return TRUE if line "lnum" in the current window is part of a closed + * fold. + * When returning TRUE, *firstp and *lastp are set to the first and last + * lnum of the sequence of folded lines (skipped when NULL). + */ + int +hasFolding(linenr_T lnum, linenr_T *firstp, linenr_T *lastp) +{ + return hasFoldingWin(curwin, lnum, firstp, lastp, TRUE, NULL); +} + +/* hasFoldingWin() {{{2 */ + int +hasFoldingWin( + win_T *win, + linenr_T lnum, + linenr_T *firstp, + linenr_T *lastp, + int cache, /* when TRUE: use cached values of window */ + foldinfo_T *infop) /* where to store fold info */ +{ + int had_folded = FALSE; + linenr_T first = 0; + linenr_T last = 0; + linenr_T lnum_rel = lnum; + int x; + fold_T *fp; + int level = 0; + int use_level = FALSE; + int maybe_small = FALSE; + garray_T *gap; + int low_level = 0; + + checkupdate(win); + + /* + * Return quickly when there is no folding at all in this window. + */ + if (!hasAnyFolding(win)) + { + if (infop != NULL) + infop->fi_level = 0; + return FALSE; + } + + if (cache) + { + /* + * First look in cached info for displayed lines. This is probably + * the fastest, but it can only be used if the entry is still valid. + */ + x = find_wl_entry(win, lnum); + if (x >= 0) + { + first = win->w_lines[x].wl_lnum; + last = win->w_lines[x].wl_lastlnum; + had_folded = win->w_lines[x].wl_folded; + } + } + + if (first == 0) + { + /* + * Recursively search for a fold that contains "lnum". + */ + gap = &win->w_folds; + for (;;) + { + if (!foldFind(gap, lnum_rel, &fp)) + break; + + /* Remember lowest level of fold that starts in "lnum". */ + if (lnum_rel == fp->fd_top && low_level == 0) + low_level = level + 1; + + first += fp->fd_top; + last += fp->fd_top; + + /* is this fold closed? */ + had_folded = check_closed(win, fp, &use_level, level, + &maybe_small, lnum - lnum_rel); + if (had_folded) + { + /* Fold closed: Set last and quit loop. */ + last += fp->fd_len - 1; + break; + } + + /* Fold found, but it's open: Check nested folds. Line number is + * relative to containing fold. */ + gap = &fp->fd_nested; + lnum_rel -= fp->fd_top; + ++level; + } + } + + if (!had_folded) + { + if (infop != NULL) + { + infop->fi_level = level; + infop->fi_lnum = lnum - lnum_rel; + infop->fi_low_level = low_level == 0 ? level : low_level; + } + return FALSE; + } + + if (last > win->w_buffer->b_ml.ml_line_count) + last = win->w_buffer->b_ml.ml_line_count; + if (lastp != NULL) + *lastp = last; + if (firstp != NULL) + *firstp = first; + if (infop != NULL) + { + infop->fi_level = level + 1; + infop->fi_lnum = first; + infop->fi_low_level = low_level == 0 ? level + 1 : low_level; + } + return TRUE; +} + +/* foldLevel() {{{2 */ +/* + * Return fold level at line number "lnum" in the current window. + */ + int +foldLevel(linenr_T lnum) +{ + /* While updating the folds lines between invalid_top and invalid_bot have + * an undefined fold level. Otherwise update the folds first. */ + if (invalid_top == (linenr_T)0) + checkupdate(curwin); + else if (lnum == prev_lnum && prev_lnum_lvl >= 0) + return prev_lnum_lvl; + else if (lnum >= invalid_top && lnum <= invalid_bot) + return -1; + + /* Return quickly when there is no folding at all in this window. */ + if (!hasAnyFolding(curwin)) + return 0; + + return foldLevelWin(curwin, lnum); +} + +/* lineFolded() {{{2 */ +/* + * Low level function to check if a line is folded. Doesn't use any caching. + * Return TRUE if line is folded. + * Return FALSE if line is not folded. + * Return MAYBE if the line is folded when next to a folded line. + */ + int +lineFolded(win_T *win, linenr_T lnum) +{ + return foldedCount(win, lnum, NULL) != 0; +} + +/* foldedCount() {{{2 */ +/* + * Count the number of lines that are folded at line number "lnum". + * Normally "lnum" is the first line of a possible fold, and the returned + * number is the number of lines in the fold. + * Doesn't use caching from the displayed window. + * Returns number of folded lines from "lnum", or 0 if line is not folded. + * When "infop" is not NULL, fills *infop with the fold level info. + */ + long +foldedCount(win_T *win, linenr_T lnum, foldinfo_T *infop) +{ + linenr_T last; + + if (hasFoldingWin(win, lnum, NULL, &last, FALSE, infop)) + return (long)(last - lnum + 1); + return 0; +} + +/* foldmethodIsManual() {{{2 */ +/* + * Return TRUE if 'foldmethod' is "manual" + */ + int +foldmethodIsManual(win_T *wp) +{ + return (wp->w_p_fdm[3] == 'u'); +} + +/* foldmethodIsIndent() {{{2 */ +/* + * Return TRUE if 'foldmethod' is "indent" + */ + int +foldmethodIsIndent(win_T *wp) +{ + return (wp->w_p_fdm[0] == 'i'); +} + +/* foldmethodIsExpr() {{{2 */ +/* + * Return TRUE if 'foldmethod' is "expr" + */ + int +foldmethodIsExpr(win_T *wp) +{ + return (wp->w_p_fdm[1] == 'x'); +} + +/* foldmethodIsMarker() {{{2 */ +/* + * Return TRUE if 'foldmethod' is "marker" + */ + int +foldmethodIsMarker(win_T *wp) +{ + return (wp->w_p_fdm[2] == 'r'); +} + +/* foldmethodIsSyntax() {{{2 */ +/* + * Return TRUE if 'foldmethod' is "syntax" + */ + int +foldmethodIsSyntax(win_T *wp) +{ + return (wp->w_p_fdm[0] == 's'); +} + +/* foldmethodIsDiff() {{{2 */ +/* + * Return TRUE if 'foldmethod' is "diff" + */ + int +foldmethodIsDiff(win_T *wp) +{ + return (wp->w_p_fdm[0] == 'd'); +} + +/* closeFold() {{{2 */ +/* + * Close fold for current window at line "lnum". + * Repeat "count" times. + */ + void +closeFold(linenr_T lnum, long count) +{ + setFoldRepeat(lnum, count, FALSE); +} + +/* closeFoldRecurse() {{{2 */ +/* + * Close fold for current window at line "lnum" recursively. + */ + void +closeFoldRecurse(linenr_T lnum) +{ + (void)setManualFold(lnum, FALSE, TRUE, NULL); +} + +/* opFoldRange() {{{2 */ +/* + * Open or Close folds for current window in lines "first" to "last". + * Used for "zo", "zO", "zc" and "zC" in Visual mode. + */ + void +opFoldRange( + linenr_T first, + linenr_T last, + int opening, /* TRUE to open, FALSE to close */ + int recurse, /* TRUE to do it recursively */ + int had_visual) /* TRUE when Visual selection used */ +{ + int done = DONE_NOTHING; /* avoid error messages */ + linenr_T lnum; + linenr_T lnum_next; + + for (lnum = first; lnum <= last; lnum = lnum_next + 1) + { + lnum_next = lnum; + /* Opening one level only: next fold to open is after the one going to + * be opened. */ + if (opening && !recurse) + (void)hasFolding(lnum, NULL, &lnum_next); + (void)setManualFold(lnum, opening, recurse, &done); + /* Closing one level only: next line to close a fold is after just + * closed fold. */ + if (!opening && !recurse) + (void)hasFolding(lnum, NULL, &lnum_next); + } + if (done == DONE_NOTHING) + emsg(_(e_nofold)); + /* Force a redraw to remove the Visual highlighting. */ + if (had_visual) + redraw_curbuf_later(INVERTED); +} + +/* openFold() {{{2 */ +/* + * Open fold for current window at line "lnum". + * Repeat "count" times. + */ + void +openFold(linenr_T lnum, long count) +{ + setFoldRepeat(lnum, count, TRUE); +} + +/* openFoldRecurse() {{{2 */ +/* + * Open fold for current window at line "lnum" recursively. + */ + void +openFoldRecurse(linenr_T lnum) +{ + (void)setManualFold(lnum, TRUE, TRUE, NULL); +} + +/* foldOpenCursor() {{{2 */ +/* + * Open folds until the cursor line is not in a closed fold. + */ + void +foldOpenCursor(void) +{ + int done; + + checkupdate(curwin); + if (hasAnyFolding(curwin)) + for (;;) + { + done = DONE_NOTHING; + (void)setManualFold(curwin->w_cursor.lnum, TRUE, FALSE, &done); + if (!(done & DONE_ACTION)) + break; + } +} + +/* newFoldLevel() {{{2 */ +/* + * Set new foldlevel for current window. + */ + void +newFoldLevel(void) +{ + newFoldLevelWin(curwin); + +#ifdef FEAT_DIFF + if (foldmethodIsDiff(curwin) && curwin->w_p_scb) + { + win_T *wp; + + /* + * Set the same foldlevel in other windows in diff mode. + */ + FOR_ALL_WINDOWS(wp) + { + if (wp != curwin && foldmethodIsDiff(wp) && wp->w_p_scb) + { + wp->w_p_fdl = curwin->w_p_fdl; + newFoldLevelWin(wp); + } + } + } +#endif +} + + static void +newFoldLevelWin(win_T *wp) +{ + fold_T *fp; + int i; + + checkupdate(wp); + if (wp->w_fold_manual) + { + /* Set all flags for the first level of folds to FD_LEVEL. Following + * manual open/close will then change the flags to FD_OPEN or + * FD_CLOSED for those folds that don't use 'foldlevel'. */ + fp = (fold_T *)wp->w_folds.ga_data; + for (i = 0; i < wp->w_folds.ga_len; ++i) + fp[i].fd_flags = FD_LEVEL; + wp->w_fold_manual = FALSE; + } + changed_window_setting_win(wp); +} + +/* foldCheckClose() {{{2 */ +/* + * Apply 'foldlevel' to all folds that don't contain the cursor. + */ + void +foldCheckClose(void) +{ + if (*p_fcl != NUL) /* can only be "all" right now */ + { + checkupdate(curwin); + if (checkCloseRec(&curwin->w_folds, curwin->w_cursor.lnum, + (int)curwin->w_p_fdl)) + changed_window_setting(); + } +} + +/* checkCloseRec() {{{2 */ + static int +checkCloseRec(garray_T *gap, linenr_T lnum, int level) +{ + fold_T *fp; + int retval = FALSE; + int i; + + fp = (fold_T *)gap->ga_data; + for (i = 0; i < gap->ga_len; ++i) + { + /* Only manually opened folds may need to be closed. */ + if (fp[i].fd_flags == FD_OPEN) + { + if (level <= 0 && (lnum < fp[i].fd_top + || lnum >= fp[i].fd_top + fp[i].fd_len)) + { + fp[i].fd_flags = FD_LEVEL; + retval = TRUE; + } + else + retval |= checkCloseRec(&fp[i].fd_nested, lnum - fp[i].fd_top, + level - 1); + } + } + return retval; +} + +/* foldCreateAllowed() {{{2 */ +/* + * Return TRUE if it's allowed to manually create or delete a fold. + * Give an error message and return FALSE if not. + */ + int +foldManualAllowed(int create) +{ + if (foldmethodIsManual(curwin) || foldmethodIsMarker(curwin)) + return TRUE; + if (create) + emsg(_("E350: Cannot create fold with current 'foldmethod'")); + else + emsg(_("E351: Cannot delete fold with current 'foldmethod'")); + return FALSE; +} + +/* foldCreate() {{{2 */ +/* + * Create a fold from line "start" to line "end" (inclusive) in the current + * window. + */ + void +foldCreate(linenr_T start, linenr_T end) +{ + fold_T *fp; + garray_T *gap; + garray_T fold_ga; + int i, j; + int cont; + int use_level = FALSE; + int closed = FALSE; + int level = 0; + linenr_T start_rel = start; + linenr_T end_rel = end; + + if (start > end) + { + /* reverse the range */ + end = start_rel; + start = end_rel; + start_rel = start; + end_rel = end; + } + + /* When 'foldmethod' is "marker" add markers, which creates the folds. */ + if (foldmethodIsMarker(curwin)) + { + foldCreateMarkers(start, end); + return; + } + + checkupdate(curwin); + + /* Find the place to insert the new fold. */ + gap = &curwin->w_folds; + for (;;) + { + if (!foldFind(gap, start_rel, &fp)) + break; + if (fp->fd_top + fp->fd_len > end_rel) + { + /* New fold is completely inside this fold: Go one level deeper. */ + gap = &fp->fd_nested; + start_rel -= fp->fd_top; + end_rel -= fp->fd_top; + if (use_level || fp->fd_flags == FD_LEVEL) + { + use_level = TRUE; + if (level >= curwin->w_p_fdl) + closed = TRUE; + } + else if (fp->fd_flags == FD_CLOSED) + closed = TRUE; + ++level; + } + else + { + /* This fold and new fold overlap: Insert here and move some folds + * inside the new fold. */ + break; + } + } + + i = (int)(fp - (fold_T *)gap->ga_data); + if (ga_grow(gap, 1) == OK) + { + fp = (fold_T *)gap->ga_data + i; + ga_init2(&fold_ga, (int)sizeof(fold_T), 10); + + /* Count number of folds that will be contained in the new fold. */ + for (cont = 0; i + cont < gap->ga_len; ++cont) + if (fp[cont].fd_top > end_rel) + break; + if (cont > 0 && ga_grow(&fold_ga, cont) == OK) + { + /* If the first fold starts before the new fold, let the new fold + * start there. Otherwise the existing fold would change. */ + if (start_rel > fp->fd_top) + start_rel = fp->fd_top; + + /* When last contained fold isn't completely contained, adjust end + * of new fold. */ + if (end_rel < fp[cont - 1].fd_top + fp[cont - 1].fd_len - 1) + end_rel = fp[cont - 1].fd_top + fp[cont - 1].fd_len - 1; + /* Move contained folds to inside new fold. */ + mch_memmove(fold_ga.ga_data, fp, sizeof(fold_T) * cont); + fold_ga.ga_len += cont; + i += cont; + + /* Adjust line numbers in contained folds to be relative to the + * new fold. */ + for (j = 0; j < cont; ++j) + ((fold_T *)fold_ga.ga_data)[j].fd_top -= start_rel; + } + /* Move remaining entries to after the new fold. */ + if (i < gap->ga_len) + mch_memmove(fp + 1, (fold_T *)gap->ga_data + i, + sizeof(fold_T) * (gap->ga_len - i)); + gap->ga_len = gap->ga_len + 1 - cont; + + /* insert new fold */ + fp->fd_nested = fold_ga; + fp->fd_top = start_rel; + fp->fd_len = end_rel - start_rel + 1; + + /* We want the new fold to be closed. If it would remain open because + * of using 'foldlevel', need to adjust fd_flags of containing folds. + */ + if (use_level && !closed && level < curwin->w_p_fdl) + closeFold(start, 1L); + if (!use_level) + curwin->w_fold_manual = TRUE; + fp->fd_flags = FD_CLOSED; + fp->fd_small = MAYBE; + + /* redraw */ + changed_window_setting(); + } +} + +/* deleteFold() {{{2 */ +/* + * Delete a fold at line "start" in the current window. + * When "end" is not 0, delete all folds from "start" to "end". + * When "recursive" is TRUE delete recursively. + */ + void +deleteFold( + linenr_T start, + linenr_T end, + int recursive, + int had_visual) /* TRUE when Visual selection used */ +{ + garray_T *gap; + fold_T *fp; + garray_T *found_ga; + fold_T *found_fp = NULL; + linenr_T found_off = 0; + int use_level; + int maybe_small = FALSE; + int level = 0; + linenr_T lnum = start; + linenr_T lnum_off; + int did_one = FALSE; + linenr_T first_lnum = MAXLNUM; + linenr_T last_lnum = 0; + + checkupdate(curwin); + + while (lnum <= end) + { + /* Find the deepest fold for "start". */ + gap = &curwin->w_folds; + found_ga = NULL; + lnum_off = 0; + use_level = FALSE; + for (;;) + { + if (!foldFind(gap, lnum - lnum_off, &fp)) + break; + /* lnum is inside this fold, remember info */ + found_ga = gap; + found_fp = fp; + found_off = lnum_off; + + /* if "lnum" is folded, don't check nesting */ + if (check_closed(curwin, fp, &use_level, level, + &maybe_small, lnum_off)) + break; + + /* check nested folds */ + gap = &fp->fd_nested; + lnum_off += fp->fd_top; + ++level; + } + if (found_ga == NULL) + { + ++lnum; + } + else + { + lnum = found_fp->fd_top + found_fp->fd_len + found_off; + + if (foldmethodIsManual(curwin)) + deleteFoldEntry(found_ga, + (int)(found_fp - (fold_T *)found_ga->ga_data), recursive); + else + { + if (first_lnum > found_fp->fd_top + found_off) + first_lnum = found_fp->fd_top + found_off; + if (last_lnum < lnum) + last_lnum = lnum; + if (!did_one) + parseMarker(curwin); + deleteFoldMarkers(found_fp, recursive, found_off); + } + did_one = TRUE; + + /* redraw window */ + changed_window_setting(); + } + } + if (!did_one) + { + emsg(_(e_nofold)); + /* Force a redraw to remove the Visual highlighting. */ + if (had_visual) + redraw_curbuf_later(INVERTED); + } + else + /* Deleting markers may make cursor column invalid. */ + check_cursor_col(); + + if (last_lnum > 0) + changed_lines(first_lnum, (colnr_T)0, last_lnum, 0L); +} + +/* clearFolding() {{{2 */ +/* + * Remove all folding for window "win". + */ + void +clearFolding(win_T *win) +{ + deleteFoldRecurse(&win->w_folds); + win->w_foldinvalid = FALSE; +} + +/* foldUpdate() {{{2 */ +/* + * Update folds for changes in the buffer of a window. + * Note that inserted/deleted lines must have already been taken care of by + * calling foldMarkAdjust(). + * The changes in lines from top to bot (inclusive). + */ + void +foldUpdate(win_T *wp, linenr_T top, linenr_T bot) +{ + fold_T *fp; + + if (disable_fold_update > 0) + return; + + /* Mark all folds from top to bot as maybe-small. */ + (void)foldFind(&wp->w_folds, top, &fp); + while (fp < (fold_T *)wp->w_folds.ga_data + wp->w_folds.ga_len + && fp->fd_top < bot) + { + fp->fd_small = MAYBE; + ++fp; + } + + if (foldmethodIsIndent(wp) + || foldmethodIsExpr(wp) + || foldmethodIsMarker(wp) +#ifdef FEAT_DIFF + || foldmethodIsDiff(wp) +#endif + || foldmethodIsSyntax(wp)) + { + int save_got_int = got_int; + + /* reset got_int here, otherwise it won't work */ + got_int = FALSE; + foldUpdateIEMS(wp, top, bot); + got_int |= save_got_int; + } +} + +/* foldUpdateAll() {{{2 */ +/* + * Update all lines in a window for folding. + * Used when a fold setting changes or after reloading the buffer. + * The actual updating is postponed until fold info is used, to avoid doing + * every time a setting is changed or a syntax item is added. + */ + void +foldUpdateAll(win_T *win) +{ + win->w_foldinvalid = TRUE; + redraw_win_later(win, NOT_VALID); +} + +/* foldMoveTo() {{{2 */ +/* + * If "updown" is FALSE: Move to the start or end of the fold. + * If "updown" is TRUE: move to fold at the same level. + * If not moved return FAIL. + */ + int +foldMoveTo( + int updown, + int dir, /* FORWARD or BACKWARD */ + long count) +{ + long n; + int retval = FAIL; + linenr_T lnum_off; + linenr_T lnum_found; + linenr_T lnum; + int use_level; + int maybe_small; + garray_T *gap; + fold_T *fp; + int level; + int last; + + checkupdate(curwin); + + /* Repeat "count" times. */ + for (n = 0; n < count; ++n) + { + /* Find nested folds. Stop when a fold is closed. The deepest fold + * that moves the cursor is used. */ + lnum_off = 0; + gap = &curwin->w_folds; + use_level = FALSE; + maybe_small = FALSE; + lnum_found = curwin->w_cursor.lnum; + level = 0; + last = FALSE; + for (;;) + { + if (!foldFind(gap, curwin->w_cursor.lnum - lnum_off, &fp)) + { + if (!updown) + break; + + /* When moving up, consider a fold above the cursor; when + * moving down consider a fold below the cursor. */ + if (dir == FORWARD) + { + if (fp - (fold_T *)gap->ga_data >= gap->ga_len) + break; + --fp; + } + else + { + if (fp == (fold_T *)gap->ga_data) + break; + } + /* don't look for contained folds, they will always move + * the cursor too far. */ + last = TRUE; + } + + if (!last) + { + /* Check if this fold is closed. */ + if (check_closed(curwin, fp, &use_level, level, + &maybe_small, lnum_off)) + last = TRUE; + + /* "[z" and "]z" stop at closed fold */ + if (last && !updown) + break; + } + + if (updown) + { + if (dir == FORWARD) + { + /* to start of next fold if there is one */ + if (fp + 1 - (fold_T *)gap->ga_data < gap->ga_len) + { + lnum = fp[1].fd_top + lnum_off; + if (lnum > curwin->w_cursor.lnum) + lnum_found = lnum; + } + } + else + { + /* to end of previous fold if there is one */ + if (fp > (fold_T *)gap->ga_data) + { + lnum = fp[-1].fd_top + lnum_off + fp[-1].fd_len - 1; + if (lnum < curwin->w_cursor.lnum) + lnum_found = lnum; + } + } + } + else + { + /* Open fold found, set cursor to its start/end and then check + * nested folds. */ + if (dir == FORWARD) + { + lnum = fp->fd_top + lnum_off + fp->fd_len - 1; + if (lnum > curwin->w_cursor.lnum) + lnum_found = lnum; + } + else + { + lnum = fp->fd_top + lnum_off; + if (lnum < curwin->w_cursor.lnum) + lnum_found = lnum; + } + } + + if (last) + break; + + /* Check nested folds (if any). */ + gap = &fp->fd_nested; + lnum_off += fp->fd_top; + ++level; + } + if (lnum_found != curwin->w_cursor.lnum) + { + if (retval == FAIL) + setpcmark(); + curwin->w_cursor.lnum = lnum_found; + curwin->w_cursor.col = 0; + retval = OK; + } + else + break; + } + + return retval; +} + +/* foldInitWin() {{{2 */ +/* + * Init the fold info in a new window. + */ + void +foldInitWin(win_T *new_win) +{ + ga_init2(&new_win->w_folds, (int)sizeof(fold_T), 10); +} + +/* find_wl_entry() {{{2 */ +/* + * Find an entry in the win->w_lines[] array for buffer line "lnum". + * Only valid entries are considered (for entries where wl_valid is FALSE the + * line number can be wrong). + * Returns index of entry or -1 if not found. + */ + int +find_wl_entry(win_T *win, linenr_T lnum) +{ + int i; + + for (i = 0; i < win->w_lines_valid; ++i) + if (win->w_lines[i].wl_valid) + { + if (lnum < win->w_lines[i].wl_lnum) + return -1; + if (lnum <= win->w_lines[i].wl_lastlnum) + return i; + } + return -1; +} + +/* foldAdjustVisual() {{{2 */ +/* + * Adjust the Visual area to include any fold at the start or end completely. + */ + void +foldAdjustVisual(void) +{ + pos_T *start, *end; + char_u *ptr; + + if (!VIsual_active || !hasAnyFolding(curwin)) + return; + + if (LTOREQ_POS(VIsual, curwin->w_cursor)) + { + start = &VIsual; + end = &curwin->w_cursor; + } + else + { + start = &curwin->w_cursor; + end = &VIsual; + } + if (hasFolding(start->lnum, &start->lnum, NULL)) + start->col = 0; + if (hasFolding(end->lnum, NULL, &end->lnum)) + { + ptr = ml_get(end->lnum); + end->col = (colnr_T)STRLEN(ptr); + if (end->col > 0 && *p_sel == 'o') + --end->col; + /* prevent cursor from moving on the trail byte */ + if (has_mbyte) + mb_adjust_cursor(); + } +} + +/* cursor_foldstart() {{{2 */ +/* + * Move the cursor to the first line of a closed fold. + */ + void +foldAdjustCursor(void) +{ + (void)hasFolding(curwin->w_cursor.lnum, &curwin->w_cursor.lnum, NULL); +} + +/* Internal functions for "fold_T" {{{1 */ +/* cloneFoldGrowArray() {{{2 */ +/* + * Will "clone" (i.e deep copy) a garray_T of folds. + * + * Return FAIL if the operation cannot be completed, otherwise OK. + */ + void +cloneFoldGrowArray(garray_T *from, garray_T *to) +{ + int i; + fold_T *from_p; + fold_T *to_p; + + ga_init2(to, from->ga_itemsize, from->ga_growsize); + if (from->ga_len == 0 || ga_grow(to, from->ga_len) == FAIL) + return; + + from_p = (fold_T *)from->ga_data; + to_p = (fold_T *)to->ga_data; + + for (i = 0; i < from->ga_len; i++) + { + to_p->fd_top = from_p->fd_top; + to_p->fd_len = from_p->fd_len; + to_p->fd_flags = from_p->fd_flags; + to_p->fd_small = from_p->fd_small; + cloneFoldGrowArray(&from_p->fd_nested, &to_p->fd_nested); + ++to->ga_len; + ++from_p; + ++to_p; + } +} + +/* foldFind() {{{2 */ +/* + * Search for line "lnum" in folds of growarray "gap". + * Set *fpp to the fold struct for the fold that contains "lnum" or + * the first fold below it (careful: it can be beyond the end of the array!). + * Returns FALSE when there is no fold that contains "lnum". + */ + static int +foldFind(garray_T *gap, linenr_T lnum, fold_T **fpp) +{ + linenr_T low, high; + fold_T *fp; + int i; + + /* + * Perform a binary search. + * "low" is lowest index of possible match. + * "high" is highest index of possible match. + */ + fp = (fold_T *)gap->ga_data; + low = 0; + high = gap->ga_len - 1; + while (low <= high) + { + i = (low + high) / 2; + if (fp[i].fd_top > lnum) + /* fold below lnum, adjust high */ + high = i - 1; + else if (fp[i].fd_top + fp[i].fd_len <= lnum) + /* fold above lnum, adjust low */ + low = i + 1; + else + { + /* lnum is inside this fold */ + *fpp = fp + i; + return TRUE; + } + } + *fpp = fp + low; + return FALSE; +} + +/* foldLevelWin() {{{2 */ +/* + * Return fold level at line number "lnum" in window "wp". + */ + static int +foldLevelWin(win_T *wp, linenr_T lnum) +{ + fold_T *fp; + linenr_T lnum_rel = lnum; + int level = 0; + garray_T *gap; + + /* Recursively search for a fold that contains "lnum". */ + gap = &wp->w_folds; + for (;;) + { + if (!foldFind(gap, lnum_rel, &fp)) + break; + /* Check nested folds. Line number is relative to containing fold. */ + gap = &fp->fd_nested; + lnum_rel -= fp->fd_top; + ++level; + } + + return level; +} + +/* checkupdate() {{{2 */ +/* + * Check if the folds in window "wp" are invalid and update them if needed. + */ + static void +checkupdate(win_T *wp) +{ + if (wp->w_foldinvalid) + { + foldUpdate(wp, (linenr_T)1, (linenr_T)MAXLNUM); /* will update all */ + wp->w_foldinvalid = FALSE; + } +} + +/* setFoldRepeat() {{{2 */ +/* + * Open or close fold for current window at line "lnum". + * Repeat "count" times. + */ + static void +setFoldRepeat(linenr_T lnum, long count, int do_open) +{ + int done; + long n; + + for (n = 0; n < count; ++n) + { + done = DONE_NOTHING; + (void)setManualFold(lnum, do_open, FALSE, &done); + if (!(done & DONE_ACTION)) + { + /* Only give an error message when no fold could be opened. */ + if (n == 0 && !(done & DONE_FOLD)) + emsg(_(e_nofold)); + break; + } + } +} + +/* setManualFold() {{{2 */ +/* + * Open or close the fold in the current window which contains "lnum". + * Also does this for other windows in diff mode when needed. + */ + static linenr_T +setManualFold( + linenr_T lnum, + int opening, /* TRUE when opening, FALSE when closing */ + int recurse, /* TRUE when closing/opening recursive */ + int *donep) +{ +#ifdef FEAT_DIFF + if (foldmethodIsDiff(curwin) && curwin->w_p_scb) + { + win_T *wp; + linenr_T dlnum; + + /* + * Do the same operation in other windows in diff mode. Calculate the + * line number from the diffs. + */ + FOR_ALL_WINDOWS(wp) + { + if (wp != curwin && foldmethodIsDiff(wp) && wp->w_p_scb) + { + dlnum = diff_lnum_win(curwin->w_cursor.lnum, wp); + if (dlnum != 0) + (void)setManualFoldWin(wp, dlnum, opening, recurse, NULL); + } + } + } +#endif + + return setManualFoldWin(curwin, lnum, opening, recurse, donep); +} + +/* setManualFoldWin() {{{2 */ +/* + * Open or close the fold in window "wp" which contains "lnum". + * "donep", when not NULL, points to flag that is set to DONE_FOLD when some + * fold was found and to DONE_ACTION when some fold was opened or closed. + * When "donep" is NULL give an error message when no fold was found for + * "lnum", but only if "wp" is "curwin". + * Return the line number of the next line that could be closed. + * It's only valid when "opening" is TRUE! + */ + static linenr_T +setManualFoldWin( + win_T *wp, + linenr_T lnum, + int opening, /* TRUE when opening, FALSE when closing */ + int recurse, /* TRUE when closing/opening recursive */ + int *donep) +{ + fold_T *fp; + fold_T *fp2; + fold_T *found = NULL; + int j; + int level = 0; + int use_level = FALSE; + int found_fold = FALSE; + garray_T *gap; + linenr_T next = MAXLNUM; + linenr_T off = 0; + int done = 0; + + checkupdate(wp); + + /* + * Find the fold, open or close it. + */ + gap = &wp->w_folds; + for (;;) + { + if (!foldFind(gap, lnum, &fp)) + { + /* If there is a following fold, continue there next time. */ + if (fp < (fold_T *)gap->ga_data + gap->ga_len) + next = fp->fd_top + off; + break; + } + + /* lnum is inside this fold */ + found_fold = TRUE; + + /* If there is a following fold, continue there next time. */ + if (fp + 1 < (fold_T *)gap->ga_data + gap->ga_len) + next = fp[1].fd_top + off; + + /* Change from level-dependent folding to manual. */ + if (use_level || fp->fd_flags == FD_LEVEL) + { + use_level = TRUE; + if (level >= wp->w_p_fdl) + fp->fd_flags = FD_CLOSED; + else + fp->fd_flags = FD_OPEN; + fp2 = (fold_T *)fp->fd_nested.ga_data; + for (j = 0; j < fp->fd_nested.ga_len; ++j) + fp2[j].fd_flags = FD_LEVEL; + } + + /* Simple case: Close recursively means closing the fold. */ + if (!opening && recurse) + { + if (fp->fd_flags != FD_CLOSED) + { + done |= DONE_ACTION; + fp->fd_flags = FD_CLOSED; + } + } + else if (fp->fd_flags == FD_CLOSED) + { + /* When opening, open topmost closed fold. */ + if (opening) + { + fp->fd_flags = FD_OPEN; + done |= DONE_ACTION; + if (recurse) + foldOpenNested(fp); + } + break; + } + + /* fold is open, check nested folds */ + found = fp; + gap = &fp->fd_nested; + lnum -= fp->fd_top; + off += fp->fd_top; + ++level; + } + if (found_fold) + { + /* When closing and not recurse, close deepest open fold. */ + if (!opening && found != NULL) + { + found->fd_flags = FD_CLOSED; + done |= DONE_ACTION; + } + wp->w_fold_manual = TRUE; + if (done & DONE_ACTION) + changed_window_setting_win(wp); + done |= DONE_FOLD; + } + else if (donep == NULL && wp == curwin) + emsg(_(e_nofold)); + + if (donep != NULL) + *donep |= done; + + return next; +} + +/* foldOpenNested() {{{2 */ +/* + * Open all nested folds in fold "fpr" recursively. + */ + static void +foldOpenNested(fold_T *fpr) +{ + int i; + fold_T *fp; + + fp = (fold_T *)fpr->fd_nested.ga_data; + for (i = 0; i < fpr->fd_nested.ga_len; ++i) + { + foldOpenNested(&fp[i]); + fp[i].fd_flags = FD_OPEN; + } +} + +/* deleteFoldEntry() {{{2 */ +/* + * Delete fold "idx" from growarray "gap". + * When "recursive" is TRUE also delete all the folds contained in it. + * When "recursive" is FALSE contained folds are moved one level up. + */ + static void +deleteFoldEntry(garray_T *gap, int idx, int recursive) +{ + fold_T *fp; + int i; + long moved; + fold_T *nfp; + + fp = (fold_T *)gap->ga_data + idx; + if (recursive || fp->fd_nested.ga_len == 0) + { + /* recursively delete the contained folds */ + deleteFoldRecurse(&fp->fd_nested); + --gap->ga_len; + if (idx < gap->ga_len) + mch_memmove(fp, fp + 1, sizeof(fold_T) * (gap->ga_len - idx)); + } + else + { + /* Move nested folds one level up, to overwrite the fold that is + * deleted. */ + moved = fp->fd_nested.ga_len; + if (ga_grow(gap, (int)(moved - 1)) == OK) + { + /* Get "fp" again, the array may have been reallocated. */ + fp = (fold_T *)gap->ga_data + idx; + + /* adjust fd_top and fd_flags for the moved folds */ + nfp = (fold_T *)fp->fd_nested.ga_data; + for (i = 0; i < moved; ++i) + { + nfp[i].fd_top += fp->fd_top; + if (fp->fd_flags == FD_LEVEL) + nfp[i].fd_flags = FD_LEVEL; + if (fp->fd_small == MAYBE) + nfp[i].fd_small = MAYBE; + } + + /* move the existing folds down to make room */ + if (idx + 1 < gap->ga_len) + mch_memmove(fp + moved, fp + 1, + sizeof(fold_T) * (gap->ga_len - (idx + 1))); + /* move the contained folds one level up */ + mch_memmove(fp, nfp, (size_t)(sizeof(fold_T) * moved)); + vim_free(nfp); + gap->ga_len += moved - 1; + } + } +} + +/* deleteFoldRecurse() {{{2 */ +/* + * Delete nested folds in a fold. + */ + void +deleteFoldRecurse(garray_T *gap) +{ + int i; + + for (i = 0; i < gap->ga_len; ++i) + deleteFoldRecurse(&(((fold_T *)(gap->ga_data))[i].fd_nested)); + ga_clear(gap); +} + +/* foldMarkAdjust() {{{2 */ +/* + * Update line numbers of folds for inserted/deleted lines. + */ + void +foldMarkAdjust( + win_T *wp, + linenr_T line1, + linenr_T line2, + long amount, + long amount_after) +{ + /* If deleting marks from line1 to line2, but not deleting all those + * lines, set line2 so that only deleted lines have their folds removed. */ + if (amount == MAXLNUM && line2 >= line1 && line2 - line1 >= -amount_after) + line2 = line1 - amount_after - 1; + /* If appending a line in Insert mode, it should be included in the fold + * just above the line. */ + if ((State & INSERT) && amount == (linenr_T)1 && line2 == MAXLNUM) + --line1; + foldMarkAdjustRecurse(&wp->w_folds, line1, line2, amount, amount_after); +} + +/* foldMarkAdjustRecurse() {{{2 */ + static void +foldMarkAdjustRecurse( + garray_T *gap, + linenr_T line1, + linenr_T line2, + long amount, + long amount_after) +{ + fold_T *fp; + int i; + linenr_T last; + linenr_T top; + + /* In Insert mode an inserted line at the top of a fold is considered part + * of the fold, otherwise it isn't. */ + if ((State & INSERT) && amount == (linenr_T)1 && line2 == MAXLNUM) + top = line1 + 1; + else + top = line1; + + /* Find the fold containing or just below "line1". */ + (void)foldFind(gap, line1, &fp); + + /* + * Adjust all folds below "line1" that are affected. + */ + for (i = (int)(fp - (fold_T *)gap->ga_data); i < gap->ga_len; ++i, ++fp) + { + /* + * Check for these situations: + * 1 2 3 + * 1 2 3 + * line1 2 3 4 5 + * 2 3 4 5 + * 2 3 4 5 + * line2 2 3 4 5 + * 3 5 6 + * 3 5 6 + */ + + last = fp->fd_top + fp->fd_len - 1; /* last line of fold */ + + /* 1. fold completely above line1: nothing to do */ + if (last < line1) + continue; + + /* 6. fold below line2: only adjust for amount_after */ + if (fp->fd_top > line2) + { + if (amount_after == 0) + break; + fp->fd_top += amount_after; + } + else + { + if (fp->fd_top >= top && last <= line2) + { + /* 4. fold completely contained in range */ + if (amount == MAXLNUM) + { + /* Deleting lines: delete the fold completely */ + deleteFoldEntry(gap, i, TRUE); + --i; /* adjust index for deletion */ + --fp; + } + else + fp->fd_top += amount; + } + else + { + if (fp->fd_top < top) + { + /* 2 or 3: need to correct nested folds too */ + foldMarkAdjustRecurse(&fp->fd_nested, line1 - fp->fd_top, + line2 - fp->fd_top, amount, amount_after); + if (last <= line2) + { + /* 2. fold contains line1, line2 is below fold */ + if (amount == MAXLNUM) + fp->fd_len = line1 - fp->fd_top; + else + fp->fd_len += amount; + } + else + { + /* 3. fold contains line1 and line2 */ + fp->fd_len += amount_after; + } + } + else + { + /* 5. fold is below line1 and contains line2; need to + * correct nested folds too */ + if (amount == MAXLNUM) + { + foldMarkAdjustRecurse(&fp->fd_nested, + line1 - fp->fd_top, + line2 - fp->fd_top, + amount, + amount_after + (fp->fd_top - top)); + fp->fd_len -= line2 - fp->fd_top + 1; + fp->fd_top = line1; + } + else + { + foldMarkAdjustRecurse(&fp->fd_nested, + line1 - fp->fd_top, + line2 - fp->fd_top, + amount, + amount_after - amount); + fp->fd_len += amount_after - amount; + fp->fd_top += amount; + } + } + } + } + } +} + +/* getDeepestNesting() {{{2 */ +/* + * Get the lowest 'foldlevel' value that makes the deepest nested fold in the + * current window open. + */ + int +getDeepestNesting(void) +{ + checkupdate(curwin); + return getDeepestNestingRecurse(&curwin->w_folds); +} + + static int +getDeepestNestingRecurse(garray_T *gap) +{ + int i; + int level; + int maxlevel = 0; + fold_T *fp; + + fp = (fold_T *)gap->ga_data; + for (i = 0; i < gap->ga_len; ++i) + { + level = getDeepestNestingRecurse(&fp[i].fd_nested) + 1; + if (level > maxlevel) + maxlevel = level; + } + + return maxlevel; +} + +/* check_closed() {{{2 */ +/* + * Check if a fold is closed and update the info needed to check nested folds. + */ + static int +check_closed( + win_T *win, + fold_T *fp, + int *use_levelp, /* TRUE: outer fold had FD_LEVEL */ + int level, /* folding depth */ + int *maybe_smallp, /* TRUE: outer this had fd_small == MAYBE */ + linenr_T lnum_off) /* line number offset for fp->fd_top */ +{ + int closed = FALSE; + + /* Check if this fold is closed. If the flag is FD_LEVEL this + * fold and all folds it contains depend on 'foldlevel'. */ + if (*use_levelp || fp->fd_flags == FD_LEVEL) + { + *use_levelp = TRUE; + if (level >= win->w_p_fdl) + closed = TRUE; + } + else if (fp->fd_flags == FD_CLOSED) + closed = TRUE; + + /* Small fold isn't closed anyway. */ + if (fp->fd_small == MAYBE) + *maybe_smallp = TRUE; + if (closed) + { + if (*maybe_smallp) + fp->fd_small = MAYBE; + checkSmall(win, fp, lnum_off); + if (fp->fd_small == TRUE) + closed = FALSE; + } + return closed; +} + +/* checkSmall() {{{2 */ +/* + * Update fd_small field of fold "fp". + */ + static void +checkSmall( + win_T *wp, + fold_T *fp, + linenr_T lnum_off) /* offset for fp->fd_top */ +{ + int count; + int n; + + if (fp->fd_small == MAYBE) + { + /* Mark any nested folds to maybe-small */ + setSmallMaybe(&fp->fd_nested); + + if (fp->fd_len > curwin->w_p_fml) + fp->fd_small = FALSE; + else + { + count = 0; + for (n = 0; n < fp->fd_len; ++n) + { + count += plines_win_nofold(wp, fp->fd_top + lnum_off + n); + if (count > curwin->w_p_fml) + { + fp->fd_small = FALSE; + return; + } + } + fp->fd_small = TRUE; + } + } +} + +/* setSmallMaybe() {{{2 */ +/* + * Set small flags in "gap" to MAYBE. + */ + static void +setSmallMaybe(garray_T *gap) +{ + int i; + fold_T *fp; + + fp = (fold_T *)gap->ga_data; + for (i = 0; i < gap->ga_len; ++i) + fp[i].fd_small = MAYBE; +} + +/* foldCreateMarkers() {{{2 */ +/* + * Create a fold from line "start" to line "end" (inclusive) in the current + * window by adding markers. + */ + static void +foldCreateMarkers(linenr_T start, linenr_T end) +{ + if (!curbuf->b_p_ma) + { + emsg(_(e_modifiable)); + return; + } + parseMarker(curwin); + + foldAddMarker(start, curwin->w_p_fmr, foldstartmarkerlen); + foldAddMarker(end, foldendmarker, foldendmarkerlen); + + /* Update both changes here, to avoid all folds after the start are + * changed when the start marker is inserted and the end isn't. */ + changed_lines(start, (colnr_T)0, end, 0L); +} + +/* foldAddMarker() {{{2 */ +/* + * Add "marker[markerlen]" in 'commentstring' to line "lnum". + */ + static void +foldAddMarker(linenr_T lnum, char_u *marker, int markerlen) +{ + char_u *cms = curbuf->b_p_cms; + char_u *line; + int line_len; + char_u *newline; + char_u *p = (char_u *)strstr((char *)curbuf->b_p_cms, "%s"); + int line_is_comment = FALSE; + + /* Allocate a new line: old-line + 'cms'-start + marker + 'cms'-end */ + line = ml_get(lnum); + line_len = (int)STRLEN(line); + + if (u_save(lnum - 1, lnum + 1) == OK) + { +#if defined(FEAT_COMMENTS) + /* Check if the line ends with an unclosed comment */ + (void)skip_comment(line, FALSE, FALSE, &line_is_comment); +#endif + newline = alloc((unsigned)(line_len + markerlen + STRLEN(cms) + 1)); + if (newline == NULL) + return; + STRCPY(newline, line); + /* Append the marker to the end of the line */ + if (p == NULL || line_is_comment) + vim_strncpy(newline + line_len, marker, markerlen); + else + { + STRCPY(newline + line_len, cms); + STRNCPY(newline + line_len + (p - cms), marker, markerlen); + STRCPY(newline + line_len + (p - cms) + markerlen, p + 2); + } + + ml_replace(lnum, newline, FALSE); + } +} + +/* deleteFoldMarkers() {{{2 */ +/* + * Delete the markers for a fold, causing it to be deleted. + */ + static void +deleteFoldMarkers( + fold_T *fp, + int recursive, + linenr_T lnum_off) /* offset for fp->fd_top */ +{ + int i; + + if (recursive) + for (i = 0; i < fp->fd_nested.ga_len; ++i) + deleteFoldMarkers((fold_T *)fp->fd_nested.ga_data + i, TRUE, + lnum_off + fp->fd_top); + foldDelMarker(fp->fd_top + lnum_off, curwin->w_p_fmr, foldstartmarkerlen); + foldDelMarker(fp->fd_top + lnum_off + fp->fd_len - 1, + foldendmarker, foldendmarkerlen); +} + +/* foldDelMarker() {{{2 */ +/* + * Delete marker "marker[markerlen]" at the end of line "lnum". + * Delete 'commentstring' if it matches. + * If the marker is not found, there is no error message. Could a missing + * close-marker. + */ + static void +foldDelMarker(linenr_T lnum, char_u *marker, int markerlen) +{ + char_u *line; + char_u *newline; + char_u *p; + int len; + char_u *cms = curbuf->b_p_cms; + char_u *cms2; + + line = ml_get(lnum); + for (p = line; *p != NUL; ++p) + if (STRNCMP(p, marker, markerlen) == 0) + { + /* Found the marker, include a digit if it's there. */ + len = markerlen; + if (VIM_ISDIGIT(p[len])) + ++len; + if (*cms != NUL) + { + /* Also delete 'commentstring' if it matches. */ + cms2 = (char_u *)strstr((char *)cms, "%s"); + if (p - line >= cms2 - cms + && STRNCMP(p - (cms2 - cms), cms, cms2 - cms) == 0 + && STRNCMP(p + len, cms2 + 2, STRLEN(cms2 + 2)) == 0) + { + p -= cms2 - cms; + len += (int)STRLEN(cms) - 2; + } + } + if (u_save(lnum - 1, lnum + 1) == OK) + { + /* Make new line: text-before-marker + text-after-marker */ + newline = alloc((unsigned)(STRLEN(line) - len + 1)); + if (newline != NULL) + { + STRNCPY(newline, line, p - line); + STRCPY(newline + (p - line), p + len); + ml_replace(lnum, newline, FALSE); + } + } + break; + } +} + +/* get_foldtext() {{{2 */ +/* + * Return the text for a closed fold at line "lnum", with last line "lnume". + * When 'foldtext' isn't set puts the result in "buf[FOLD_TEXT_LEN]". + * Otherwise the result is in allocated memory. + */ + char_u * +get_foldtext( + win_T *wp, + linenr_T lnum, + linenr_T lnume, + foldinfo_T *foldinfo, + char_u *buf) +{ + char_u *text = NULL; +#ifdef FEAT_EVAL + /* an error occurred when evaluating 'fdt' setting */ + static int got_fdt_error = FALSE; + int save_did_emsg = did_emsg; + static win_T *last_wp = NULL; + static linenr_T last_lnum = 0; + + if (last_wp != wp || last_wp == NULL + || last_lnum > lnum || last_lnum == 0) + /* window changed, try evaluating foldtext setting once again */ + got_fdt_error = FALSE; + + if (!got_fdt_error) + /* a previous error should not abort evaluating 'foldexpr' */ + did_emsg = FALSE; + + if (*wp->w_p_fdt != NUL) + { + char_u dashes[MAX_LEVEL + 2]; + win_T *save_curwin; + int level; + char_u *p; + + /* Set "v:foldstart" and "v:foldend". */ + set_vim_var_nr(VV_FOLDSTART, lnum); + set_vim_var_nr(VV_FOLDEND, lnume); + + /* Set "v:folddashes" to a string of "level" dashes. */ + /* Set "v:foldlevel" to "level". */ + level = foldinfo->fi_level; + if (level > (int)sizeof(dashes) - 1) + level = (int)sizeof(dashes) - 1; + vim_memset(dashes, '-', (size_t)level); + dashes[level] = NUL; + set_vim_var_string(VV_FOLDDASHES, dashes, -1); + set_vim_var_nr(VV_FOLDLEVEL, (long)level); + + /* skip evaluating foldtext on errors */ + if (!got_fdt_error) + { + save_curwin = curwin; + curwin = wp; + curbuf = wp->w_buffer; + + ++emsg_silent; /* handle exceptions, but don't display errors */ + text = eval_to_string_safe(wp->w_p_fdt, NULL, + was_set_insecurely((char_u *)"foldtext", OPT_LOCAL)); + --emsg_silent; + + if (text == NULL || did_emsg) + got_fdt_error = TRUE; + + curwin = save_curwin; + curbuf = curwin->w_buffer; + } + last_lnum = lnum; + last_wp = wp; + set_vim_var_string(VV_FOLDDASHES, NULL, -1); + + if (!did_emsg && save_did_emsg) + did_emsg = save_did_emsg; + + if (text != NULL) + { + /* Replace unprintable characters, if there are any. But + * replace a TAB with a space. */ + for (p = text; *p != NUL; ++p) + { + int len; + + if (has_mbyte && (len = (*mb_ptr2len)(p)) > 1) + { + if (!vim_isprintc((*mb_ptr2char)(p))) + break; + p += len - 1; + } + else + if (*p == TAB) + *p = ' '; + else if (ptr2cells(p) > 1) + break; + } + if (*p != NUL) + { + p = transstr(text); + vim_free(text); + text = p; + } + } + } + if (text == NULL) +#endif + { + long count = (long)(lnume - lnum + 1); + + vim_snprintf((char *)buf, FOLD_TEXT_LEN, + NGETTEXT("+--%3ld line folded ", + "+--%3ld lines folded ", count), + count); + text = buf; + } + return text; +} + +/* foldtext_cleanup() {{{2 */ +/* + * Remove 'foldmarker' and 'commentstring' from "str" (in-place). + */ + void +foldtext_cleanup(char_u *str) +{ + char_u *cms_start; /* first part or the whole comment */ + int cms_slen = 0; /* length of cms_start */ + char_u *cms_end; /* last part of the comment or NULL */ + int cms_elen = 0; /* length of cms_end */ + char_u *s; + char_u *p; + int len; + int did1 = FALSE; + int did2 = FALSE; + + /* Ignore leading and trailing white space in 'commentstring'. */ + cms_start = skipwhite(curbuf->b_p_cms); + cms_slen = (int)STRLEN(cms_start); + while (cms_slen > 0 && VIM_ISWHITE(cms_start[cms_slen - 1])) + --cms_slen; + + /* locate "%s" in 'commentstring', use the part before and after it. */ + cms_end = (char_u *)strstr((char *)cms_start, "%s"); + if (cms_end != NULL) + { + cms_elen = cms_slen - (int)(cms_end - cms_start); + cms_slen = (int)(cms_end - cms_start); + + /* exclude white space before "%s" */ + while (cms_slen > 0 && VIM_ISWHITE(cms_start[cms_slen - 1])) + --cms_slen; + + /* skip "%s" and white space after it */ + s = skipwhite(cms_end + 2); + cms_elen -= (int)(s - cms_end); + cms_end = s; + } + parseMarker(curwin); + + for (s = str; *s != NUL; ) + { + len = 0; + if (STRNCMP(s, curwin->w_p_fmr, foldstartmarkerlen) == 0) + len = foldstartmarkerlen; + else if (STRNCMP(s, foldendmarker, foldendmarkerlen) == 0) + len = foldendmarkerlen; + if (len > 0) + { + if (VIM_ISDIGIT(s[len])) + ++len; + + /* May remove 'commentstring' start. Useful when it's a double + * quote and we already removed a double quote. */ + for (p = s; p > str && VIM_ISWHITE(p[-1]); --p) + ; + if (p >= str + cms_slen + && STRNCMP(p - cms_slen, cms_start, cms_slen) == 0) + { + len += (int)(s - p) + cms_slen; + s = p - cms_slen; + } + } + else if (cms_end != NULL) + { + if (!did1 && cms_slen > 0 && STRNCMP(s, cms_start, cms_slen) == 0) + { + len = cms_slen; + did1 = TRUE; + } + else if (!did2 && cms_elen > 0 + && STRNCMP(s, cms_end, cms_elen) == 0) + { + len = cms_elen; + did2 = TRUE; + } + } + if (len != 0) + { + while (VIM_ISWHITE(s[len])) + ++len; + STRMOVE(s, s + len); + } + else + { + MB_PTR_ADV(s); + } + } +} + +/* Folding by indent, expr, marker and syntax. {{{1 */ +/* Define "fline_T", passed to get fold level for a line. {{{2 */ +typedef struct +{ + win_T *wp; /* window */ + linenr_T lnum; /* current line number */ + linenr_T off; /* offset between lnum and real line number */ + linenr_T lnum_save; /* line nr used by foldUpdateIEMSRecurse() */ + int lvl; /* current level (-1 for undefined) */ + int lvl_next; /* level used for next line */ + int start; /* number of folds that are forced to start at + this line. */ + int end; /* level of fold that is forced to end below + this line */ + int had_end; /* level of fold that is forced to end above + this line (copy of "end" of prev. line) */ +} fline_T; + +/* Flag is set when redrawing is needed. */ +static int fold_changed; + +/* Function declarations. {{{2 */ +static linenr_T foldUpdateIEMSRecurse(garray_T *gap, int level, linenr_T startlnum, fline_T *flp, void (*getlevel)(fline_T *), linenr_T bot, int topflags); +static int foldInsert(garray_T *gap, int i); +static void foldSplit(garray_T *gap, int i, linenr_T top, linenr_T bot); +static void foldRemove(garray_T *gap, linenr_T top, linenr_T bot); +static void foldMerge(fold_T *fp1, garray_T *gap, fold_T *fp2); +static void foldlevelIndent(fline_T *flp); +#ifdef FEAT_DIFF +static void foldlevelDiff(fline_T *flp); +#endif +static void foldlevelExpr(fline_T *flp); +static void foldlevelMarker(fline_T *flp); +static void foldlevelSyntax(fline_T *flp); + +/* foldUpdateIEMS() {{{2 */ +/* + * Update the folding for window "wp", at least from lines "top" to "bot". + * Return TRUE if any folds did change. + */ + static void +foldUpdateIEMS(win_T *wp, linenr_T top, linenr_T bot) +{ + linenr_T start; + linenr_T end; + fline_T fline; + void (*getlevel)(fline_T *); + int level; + fold_T *fp; + + /* Avoid problems when being called recursively. */ + if (invalid_top != (linenr_T)0) + return; + + if (wp->w_foldinvalid) + { + /* Need to update all folds. */ + top = 1; + bot = wp->w_buffer->b_ml.ml_line_count; + wp->w_foldinvalid = FALSE; + + /* Mark all folds a maybe-small. */ + setSmallMaybe(&wp->w_folds); + } + +#ifdef FEAT_DIFF + /* add the context for "diff" folding */ + if (foldmethodIsDiff(wp)) + { + if (top > diff_context) + top -= diff_context; + else + top = 1; + bot += diff_context; + } +#endif + + /* When deleting lines at the end of the buffer "top" can be past the end + * of the buffer. */ + if (top > wp->w_buffer->b_ml.ml_line_count) + top = wp->w_buffer->b_ml.ml_line_count; + + fold_changed = FALSE; + fline.wp = wp; + fline.off = 0; + fline.lvl = 0; + fline.lvl_next = -1; + fline.start = 0; + fline.end = MAX_LEVEL + 1; + fline.had_end = MAX_LEVEL + 1; + + invalid_top = top; + invalid_bot = bot; + + if (foldmethodIsMarker(wp)) + { + getlevel = foldlevelMarker; + + /* Init marker variables to speed up foldlevelMarker(). */ + parseMarker(wp); + + /* Need to get the level of the line above top, it is used if there is + * no marker at the top. */ + if (top > 1) + { + /* Get the fold level at top - 1. */ + level = foldLevelWin(wp, top - 1); + + /* The fold may end just above the top, check for that. */ + fline.lnum = top - 1; + fline.lvl = level; + getlevel(&fline); + + /* If a fold started here, we already had the level, if it stops + * here, we need to use lvl_next. Could also start and end a fold + * in the same line. */ + if (fline.lvl > level) + fline.lvl = level - (fline.lvl - fline.lvl_next); + else + fline.lvl = fline.lvl_next; + } + fline.lnum = top; + getlevel(&fline); + } + else + { + fline.lnum = top; + if (foldmethodIsExpr(wp)) + { + getlevel = foldlevelExpr; + /* start one line back, because a "<1" may indicate the end of a + * fold in the topline */ + if (top > 1) + --fline.lnum; + } + else if (foldmethodIsSyntax(wp)) + getlevel = foldlevelSyntax; +#ifdef FEAT_DIFF + else if (foldmethodIsDiff(wp)) + getlevel = foldlevelDiff; +#endif + else + getlevel = foldlevelIndent; + + /* Backup to a line for which the fold level is defined. Since it's + * always defined for line one, we will stop there. */ + fline.lvl = -1; + for ( ; !got_int; --fline.lnum) + { + /* Reset lvl_next each time, because it will be set to a value for + * the next line, but we search backwards here. */ + fline.lvl_next = -1; + getlevel(&fline); + if (fline.lvl >= 0) + break; + } + } + + /* + * If folding is defined by the syntax, it is possible that a change in + * one line will cause all sub-folds of the current fold to change (e.g., + * closing a C-style comment can cause folds in the subsequent lines to + * appear). To take that into account we should adjust the value of "bot" + * to point to the end of the current fold: + */ + if (foldlevelSyntax == getlevel) + { + garray_T *gap = &wp->w_folds; + fold_T *fpn = NULL; + int current_fdl = 0; + linenr_T fold_start_lnum = 0; + linenr_T lnum_rel = fline.lnum; + + while (current_fdl < fline.lvl) + { + if (!foldFind(gap, lnum_rel, &fpn)) + break; + ++current_fdl; + + fold_start_lnum += fpn->fd_top; + gap = &fpn->fd_nested; + lnum_rel -= fpn->fd_top; + } + if (fpn != NULL && current_fdl == fline.lvl) + { + linenr_T fold_end_lnum = fold_start_lnum + fpn->fd_len; + + if (fold_end_lnum > bot) + bot = fold_end_lnum; + } + } + + start = fline.lnum; + end = bot; + /* Do at least one line. */ + if (start > end && end < wp->w_buffer->b_ml.ml_line_count) + end = start; + while (!got_int) + { + /* Always stop at the end of the file ("end" can be past the end of + * the file). */ + if (fline.lnum > wp->w_buffer->b_ml.ml_line_count) + break; + if (fline.lnum > end) + { + /* For "marker", "expr" and "syntax" methods: If a change caused + * a fold to be removed, we need to continue at least until where + * it ended. */ + if (getlevel != foldlevelMarker + && getlevel != foldlevelSyntax + && getlevel != foldlevelExpr) + break; + if ((start <= end + && foldFind(&wp->w_folds, end, &fp) + && fp->fd_top + fp->fd_len - 1 > end) + || (fline.lvl == 0 + && foldFind(&wp->w_folds, fline.lnum, &fp) + && fp->fd_top < fline.lnum)) + end = fp->fd_top + fp->fd_len - 1; + else if (getlevel == foldlevelSyntax + && foldLevelWin(wp, fline.lnum) != fline.lvl) + /* For "syntax" method: Compare the foldlevel that the syntax + * tells us to the foldlevel from the existing folds. If they + * don't match continue updating folds. */ + end = fline.lnum; + else + break; + } + + /* A level 1 fold starts at a line with foldlevel > 0. */ + if (fline.lvl > 0) + { + invalid_top = fline.lnum; + invalid_bot = end; + end = foldUpdateIEMSRecurse(&wp->w_folds, + 1, start, &fline, getlevel, end, FD_LEVEL); + start = fline.lnum; + } + else + { + if (fline.lnum == wp->w_buffer->b_ml.ml_line_count) + break; + ++fline.lnum; + fline.lvl = fline.lvl_next; + getlevel(&fline); + } + } + + /* There can't be any folds from start until end now. */ + foldRemove(&wp->w_folds, start, end); + + /* If some fold changed, need to redraw and position cursor. */ + if (fold_changed && wp->w_p_fen) + changed_window_setting_win(wp); + + /* If we updated folds past "bot", need to redraw more lines. Don't do + * this in other situations, the changed lines will be redrawn anyway and + * this method can cause the whole window to be updated. */ + if (end != bot) + { + if (wp->w_redraw_top == 0 || wp->w_redraw_top > top) + wp->w_redraw_top = top; + if (wp->w_redraw_bot < end) + wp->w_redraw_bot = end; + } + + invalid_top = (linenr_T)0; +} + +/* foldUpdateIEMSRecurse() {{{2 */ +/* + * Update a fold that starts at "flp->lnum". At this line there is always a + * valid foldlevel, and its level >= "level". + * "flp" is valid for "flp->lnum" when called and it's valid when returning. + * "flp->lnum" is set to the lnum just below the fold, if it ends before + * "bot", it's "bot" plus one if the fold continues and it's bigger when using + * the marker method and a text change made following folds to change. + * When returning, "flp->lnum_save" is the line number that was used to get + * the level when the level at "flp->lnum" is invalid. + * Remove any folds from "startlnum" up to here at this level. + * Recursively update nested folds. + * Below line "bot" there are no changes in the text. + * "flp->lnum", "flp->lnum_save" and "bot" are relative to the start of the + * outer fold. + * "flp->off" is the offset to the real line number in the buffer. + * + * All this would be a lot simpler if all folds in the range would be deleted + * and then created again. But we would lose all information about the + * folds, even when making changes that don't affect the folding (e.g. "vj~"). + * + * Returns bot, which may have been increased for lines that also need to be + * updated as a result of a detected change in the fold. + */ + static linenr_T +foldUpdateIEMSRecurse( + garray_T *gap, + int level, + linenr_T startlnum, + fline_T *flp, + void (*getlevel)(fline_T *), + linenr_T bot, + int topflags) /* flags used by containing fold */ +{ + linenr_T ll; + fold_T *fp = NULL; + fold_T *fp2; + int lvl = level; + linenr_T startlnum2 = startlnum; + linenr_T firstlnum = flp->lnum; /* first lnum we got */ + int i; + int finish = FALSE; + linenr_T linecount = flp->wp->w_buffer->b_ml.ml_line_count - flp->off; + int concat; + + /* + * If using the marker method, the start line is not the start of a fold + * at the level we're dealing with and the level is non-zero, we must use + * the previous fold. But ignore a fold that starts at or below + * startlnum, it must be deleted. + */ + if (getlevel == foldlevelMarker && flp->start <= flp->lvl - level + && flp->lvl > 0) + { + (void)foldFind(gap, startlnum - 1, &fp); + if (fp >= ((fold_T *)gap->ga_data) + gap->ga_len + || fp->fd_top >= startlnum) + fp = NULL; + } + + /* + * Loop over all lines in this fold, or until "bot" is hit. + * Handle nested folds inside of this fold. + * "flp->lnum" is the current line. When finding the end of the fold, it + * is just below the end of the fold. + * "*flp" contains the level of the line "flp->lnum" or a following one if + * there are lines with an invalid fold level. "flp->lnum_save" is the + * line number that was used to get the fold level (below "flp->lnum" when + * it has an invalid fold level). When called the fold level is always + * valid, thus "flp->lnum_save" is equal to "flp->lnum". + */ + flp->lnum_save = flp->lnum; + while (!got_int) + { + /* Updating folds can be slow, check for CTRL-C. */ + line_breakcheck(); + + /* Set "lvl" to the level of line "flp->lnum". When flp->start is set + * and after the first line of the fold, set the level to zero to + * force the fold to end. Do the same when had_end is set: Previous + * line was marked as end of a fold. */ + lvl = flp->lvl; + if (lvl > MAX_LEVEL) + lvl = MAX_LEVEL; + if (flp->lnum > firstlnum + && (level > lvl - flp->start || level >= flp->had_end)) + lvl = 0; + + if (flp->lnum > bot && !finish && fp != NULL) + { + /* For "marker" and "syntax" methods: + * - If a change caused a nested fold to be removed, we need to + * delete it and continue at least until where it ended. + * - If a change caused a nested fold to be created, or this fold + * to continue below its original end, need to finish this fold. + */ + if (getlevel != foldlevelMarker + && getlevel != foldlevelExpr + && getlevel != foldlevelSyntax) + break; + i = 0; + fp2 = fp; + if (lvl >= level) + { + /* Compute how deep the folds currently are, if it's deeper + * than "lvl" then some must be deleted, need to update + * at least one nested fold. */ + ll = flp->lnum - fp->fd_top; + while (foldFind(&fp2->fd_nested, ll, &fp2)) + { + ++i; + ll -= fp2->fd_top; + } + } + if (lvl < level + i) + { + (void)foldFind(&fp->fd_nested, flp->lnum - fp->fd_top, &fp2); + if (fp2 != NULL) + bot = fp2->fd_top + fp2->fd_len - 1 + fp->fd_top; + } + else if (fp->fd_top + fp->fd_len <= flp->lnum && lvl >= level) + finish = TRUE; + else + break; + } + + /* At the start of the first nested fold and at the end of the current + * fold: check if existing folds at this level, before the current + * one, need to be deleted or truncated. */ + if (fp == NULL + && (lvl != level + || flp->lnum_save >= bot + || flp->start != 0 + || flp->had_end <= MAX_LEVEL + || flp->lnum == linecount)) + { + /* + * Remove or update folds that have lines between startlnum and + * firstlnum. + */ + while (!got_int) + { + /* set concat to 1 if it's allowed to concatenated this fold + * with a previous one that touches it. */ + if (flp->start != 0 || flp->had_end <= MAX_LEVEL) + concat = 0; + else + concat = 1; + + /* Find an existing fold to re-use. Preferably one that + * includes startlnum, otherwise one that ends just before + * startlnum or starts after it. */ + if (foldFind(gap, startlnum, &fp) + || (fp < ((fold_T *)gap->ga_data) + gap->ga_len + && fp->fd_top <= firstlnum) + || foldFind(gap, firstlnum - concat, &fp) + || (fp < ((fold_T *)gap->ga_data) + gap->ga_len + && ((lvl < level && fp->fd_top < flp->lnum) + || (lvl >= level + && fp->fd_top <= flp->lnum_save)))) + { + if (fp->fd_top + fp->fd_len + concat > firstlnum) + { + /* Use existing fold for the new fold. If it starts + * before where we started looking, extend it. If it + * starts at another line, update nested folds to keep + * their position, compensating for the new fd_top. */ + if (fp->fd_top == firstlnum) + { + /* have found a fold beginning where we want */ + } + else if (fp->fd_top >= startlnum) + { + if (fp->fd_top > firstlnum) + /* like lines are inserted */ + foldMarkAdjustRecurse(&fp->fd_nested, + (linenr_T)0, (linenr_T)MAXLNUM, + (long)(fp->fd_top - firstlnum), 0L); + else + /* like lines are deleted */ + foldMarkAdjustRecurse(&fp->fd_nested, + (linenr_T)0, + (long)(firstlnum - fp->fd_top - 1), + (linenr_T)MAXLNUM, + (long)(fp->fd_top - firstlnum)); + fp->fd_len += fp->fd_top - firstlnum; + fp->fd_top = firstlnum; + fold_changed = TRUE; + } + else if ((flp->start != 0 && lvl == level) + || firstlnum != startlnum) + { + linenr_T breakstart; + linenr_T breakend; + + /* + * Before there was a fold spanning from above + * startlnum to below firstlnum. This fold is valid + * above startlnum (because we are not updating + * that range), but there should now be a break in + * it. + * If the break is because we are now forced to + * start a new fold at the level "level" at line + * fline->lnum, then we need to split the fold at + * fline->lnum. + * If the break is because the range + * [startlnum, firstlnum) is now at a lower indent + * than "level", we need to split the fold in this + * range. + * Any splits have to be done recursively. + */ + if (firstlnum != startlnum) + { + breakstart = startlnum; + breakend = firstlnum; + } + else + { + breakstart = flp->lnum; + breakend = flp->lnum; + } + foldRemove(&fp->fd_nested, breakstart - fp->fd_top, + breakend - fp->fd_top); + i = (int)(fp - (fold_T *)gap->ga_data); + foldSplit(gap, i, breakstart, breakend - 1); + fp = (fold_T *)gap->ga_data + i + 1; + + /* If using the "marker" or "syntax" method, we + * need to continue until the end of the fold is + * found. */ + if (getlevel == foldlevelMarker + || getlevel == foldlevelExpr + || getlevel == foldlevelSyntax) + finish = TRUE; + } + + if (fp->fd_top == startlnum && concat) + { + i = (int)(fp - (fold_T *)gap->ga_data); + if (i != 0) + { + fp2 = fp - 1; + if (fp2->fd_top + fp2->fd_len == fp->fd_top) + { + foldMerge(fp2, gap, fp); + fp = fp2; + } + } + } + break; + } + if (fp->fd_top >= startlnum) + { + /* A fold that starts at or after startlnum and stops + * before the new fold must be deleted. Continue + * looking for the next one. */ + deleteFoldEntry(gap, + (int)(fp - (fold_T *)gap->ga_data), TRUE); + } + else + { + /* A fold has some lines above startlnum, truncate it + * to stop just above startlnum. */ + fp->fd_len = startlnum - fp->fd_top; + foldMarkAdjustRecurse(&fp->fd_nested, + (linenr_T)fp->fd_len, (linenr_T)MAXLNUM, + (linenr_T)MAXLNUM, 0L); + fold_changed = TRUE; + } + } + else + { + /* Insert new fold. Careful: ga_data may be NULL and it + * may change! */ + i = (int)(fp - (fold_T *)gap->ga_data); + if (foldInsert(gap, i) != OK) + return bot; + fp = (fold_T *)gap->ga_data + i; + /* The new fold continues until bot, unless we find the + * end earlier. */ + fp->fd_top = firstlnum; + fp->fd_len = bot - firstlnum + 1; + /* When the containing fold is open, the new fold is open. + * The new fold is closed if the fold above it is closed. + * The first fold depends on the containing fold. */ + if (topflags == FD_OPEN) + { + flp->wp->w_fold_manual = TRUE; + fp->fd_flags = FD_OPEN; + } + else if (i <= 0) + { + fp->fd_flags = topflags; + if (topflags != FD_LEVEL) + flp->wp->w_fold_manual = TRUE; + } + else + fp->fd_flags = (fp - 1)->fd_flags; + fp->fd_small = MAYBE; + /* If using the "marker", "expr" or "syntax" method, we + * need to continue until the end of the fold is found. */ + if (getlevel == foldlevelMarker + || getlevel == foldlevelExpr + || getlevel == foldlevelSyntax) + finish = TRUE; + fold_changed = TRUE; + break; + } + } + } + + if (lvl < level || flp->lnum > linecount) + { + /* + * Found a line with a lower foldlevel, this fold ends just above + * "flp->lnum". + */ + break; + } + + /* + * The fold includes the line "flp->lnum" and "flp->lnum_save". + * Check "fp" for safety. + */ + if (lvl > level && fp != NULL) + { + /* + * There is a nested fold, handle it recursively. + */ + /* At least do one line (can happen when finish is TRUE). */ + if (bot < flp->lnum) + bot = flp->lnum; + + /* Line numbers in the nested fold are relative to the start of + * this fold. */ + flp->lnum = flp->lnum_save - fp->fd_top; + flp->off += fp->fd_top; + i = (int)(fp - (fold_T *)gap->ga_data); + bot = foldUpdateIEMSRecurse(&fp->fd_nested, level + 1, + startlnum2 - fp->fd_top, flp, getlevel, + bot - fp->fd_top, fp->fd_flags); + fp = (fold_T *)gap->ga_data + i; + flp->lnum += fp->fd_top; + flp->lnum_save += fp->fd_top; + flp->off -= fp->fd_top; + bot += fp->fd_top; + startlnum2 = flp->lnum; + + /* This fold may end at the same line, don't incr. flp->lnum. */ + } + else + { + /* + * Get the level of the next line, then continue the loop to check + * if it ends there. + * Skip over undefined lines, to find the foldlevel after it. + * For the last line in the file the foldlevel is always valid. + */ + flp->lnum = flp->lnum_save; + ll = flp->lnum + 1; + while (!got_int) + { + /* Make the previous level available to foldlevel(). */ + prev_lnum = flp->lnum; + prev_lnum_lvl = flp->lvl; + + if (++flp->lnum > linecount) + break; + flp->lvl = flp->lvl_next; + getlevel(flp); + if (flp->lvl >= 0 || flp->had_end <= MAX_LEVEL) + break; + } + prev_lnum = 0; + if (flp->lnum > linecount) + break; + + /* leave flp->lnum_save to lnum of the line that was used to get + * the level, flp->lnum to the lnum of the next line. */ + flp->lnum_save = flp->lnum; + flp->lnum = ll; + } + } + + if (fp == NULL) /* only happens when got_int is set */ + return bot; + + /* + * Get here when: + * lvl < level: the folds ends just above "flp->lnum" + * lvl >= level: fold continues below "bot" + */ + + /* Current fold at least extends until lnum. */ + if (fp->fd_len < flp->lnum - fp->fd_top) + { + fp->fd_len = flp->lnum - fp->fd_top; + fp->fd_small = MAYBE; + fold_changed = TRUE; + } + + /* Delete contained folds from the end of the last one found until where + * we stopped looking. */ + foldRemove(&fp->fd_nested, startlnum2 - fp->fd_top, + flp->lnum - 1 - fp->fd_top); + + if (lvl < level) + { + /* End of fold found, update the length when it got shorter. */ + if (fp->fd_len != flp->lnum - fp->fd_top) + { + if (fp->fd_top + fp->fd_len - 1 > bot) + { + /* fold continued below bot */ + if (getlevel == foldlevelMarker + || getlevel == foldlevelExpr + || getlevel == foldlevelSyntax) + { + /* marker method: truncate the fold and make sure the + * previously included lines are processed again */ + bot = fp->fd_top + fp->fd_len - 1; + fp->fd_len = flp->lnum - fp->fd_top; + } + else + { + /* indent or expr method: split fold to create a new one + * below bot */ + i = (int)(fp - (fold_T *)gap->ga_data); + foldSplit(gap, i, flp->lnum, bot); + fp = (fold_T *)gap->ga_data + i; + } + } + else + fp->fd_len = flp->lnum - fp->fd_top; + fold_changed = TRUE; + } + } + + /* delete following folds that end before the current line */ + for (;;) + { + fp2 = fp + 1; + if (fp2 >= (fold_T *)gap->ga_data + gap->ga_len + || fp2->fd_top > flp->lnum) + break; + if (fp2->fd_top + fp2->fd_len > flp->lnum) + { + if (fp2->fd_top < flp->lnum) + { + /* Make fold that includes lnum start at lnum. */ + foldMarkAdjustRecurse(&fp2->fd_nested, + (linenr_T)0, (long)(flp->lnum - fp2->fd_top - 1), + (linenr_T)MAXLNUM, (long)(fp2->fd_top - flp->lnum)); + fp2->fd_len -= flp->lnum - fp2->fd_top; + fp2->fd_top = flp->lnum; + fold_changed = TRUE; + } + + if (lvl >= level) + { + /* merge new fold with existing fold that follows */ + foldMerge(fp, gap, fp2); + } + break; + } + fold_changed = TRUE; + deleteFoldEntry(gap, (int)(fp2 - (fold_T *)gap->ga_data), TRUE); + } + + /* Need to redraw the lines we inspected, which might be further down than + * was asked for. */ + if (bot < flp->lnum - 1) + bot = flp->lnum - 1; + + return bot; +} + +/* foldInsert() {{{2 */ +/* + * Insert a new fold in "gap" at position "i". + * Returns OK for success, FAIL for failure. + */ + static int +foldInsert(garray_T *gap, int i) +{ + fold_T *fp; + + if (ga_grow(gap, 1) != OK) + return FAIL; + fp = (fold_T *)gap->ga_data + i; + if (i < gap->ga_len) + mch_memmove(fp + 1, fp, sizeof(fold_T) * (gap->ga_len - i)); + ++gap->ga_len; + ga_init2(&fp->fd_nested, (int)sizeof(fold_T), 10); + return OK; +} + +/* foldSplit() {{{2 */ +/* + * Split the "i"th fold in "gap", which starts before "top" and ends below + * "bot" in two pieces, one ending above "top" and the other starting below + * "bot". + * The caller must first have taken care of any nested folds from "top" to + * "bot"! + */ + static void +foldSplit( + garray_T *gap, + int i, + linenr_T top, + linenr_T bot) +{ + fold_T *fp; + fold_T *fp2; + garray_T *gap1; + garray_T *gap2; + int idx; + int len; + + /* The fold continues below bot, need to split it. */ + if (foldInsert(gap, i + 1) == FAIL) + return; + fp = (fold_T *)gap->ga_data + i; + fp[1].fd_top = bot + 1; + fp[1].fd_len = fp->fd_len - (fp[1].fd_top - fp->fd_top); + fp[1].fd_flags = fp->fd_flags; + fp[1].fd_small = MAYBE; + fp->fd_small = MAYBE; + + /* Move nested folds below bot to new fold. There can't be + * any between top and bot, they have been removed by the caller. */ + gap1 = &fp->fd_nested; + gap2 = &fp[1].fd_nested; + (void)(foldFind(gap1, bot + 1 - fp->fd_top, &fp2)); + len = (int)((fold_T *)gap1->ga_data + gap1->ga_len - fp2); + if (len > 0 && ga_grow(gap2, len) == OK) + { + for (idx = 0; idx < len; ++idx) + { + ((fold_T *)gap2->ga_data)[idx] = fp2[idx]; + ((fold_T *)gap2->ga_data)[idx].fd_top + -= fp[1].fd_top - fp->fd_top; + } + gap2->ga_len = len; + gap1->ga_len -= len; + } + fp->fd_len = top - fp->fd_top; + fold_changed = TRUE; +} + +/* foldRemove() {{{2 */ +/* + * Remove folds within the range "top" to and including "bot". + * Check for these situations: + * 1 2 3 + * 1 2 3 + * top 2 3 4 5 + * 2 3 4 5 + * bot 2 3 4 5 + * 3 5 6 + * 3 5 6 + * + * 1: not changed + * 2: truncate to stop above "top" + * 3: split in two parts, one stops above "top", other starts below "bot". + * 4: deleted + * 5: made to start below "bot". + * 6: not changed + */ + static void +foldRemove(garray_T *gap, linenr_T top, linenr_T bot) +{ + fold_T *fp = NULL; + + if (bot < top) + return; /* nothing to do */ + + for (;;) + { + /* Find fold that includes top or a following one. */ + if (foldFind(gap, top, &fp) && fp->fd_top < top) + { + /* 2: or 3: need to delete nested folds */ + foldRemove(&fp->fd_nested, top - fp->fd_top, bot - fp->fd_top); + if (fp->fd_top + fp->fd_len - 1 > bot) + { + /* 3: need to split it. */ + foldSplit(gap, (int)(fp - (fold_T *)gap->ga_data), top, bot); + } + else + { + /* 2: truncate fold at "top". */ + fp->fd_len = top - fp->fd_top; + } + fold_changed = TRUE; + continue; + } + if (fp >= (fold_T *)(gap->ga_data) + gap->ga_len + || fp->fd_top > bot) + { + /* 6: Found a fold below bot, can stop looking. */ + break; + } + if (fp->fd_top >= top) + { + /* Found an entry below top. */ + fold_changed = TRUE; + if (fp->fd_top + fp->fd_len - 1 > bot) + { + /* 5: Make fold that includes bot start below bot. */ + foldMarkAdjustRecurse(&fp->fd_nested, + (linenr_T)0, (long)(bot - fp->fd_top), + (linenr_T)MAXLNUM, (long)(fp->fd_top - bot - 1)); + fp->fd_len -= bot - fp->fd_top + 1; + fp->fd_top = bot + 1; + break; + } + + /* 4: Delete completely contained fold. */ + deleteFoldEntry(gap, (int)(fp - (fold_T *)gap->ga_data), TRUE); + } + } +} + +/* foldReverseOrder() {{{2 */ + static void +foldReverseOrder(garray_T *gap, linenr_T start_arg, linenr_T end_arg) +{ + fold_T *left, *right; + fold_T tmp; + linenr_T start = start_arg; + linenr_T end = end_arg; + + for (; start < end; start++, end--) + { + left = (fold_T *)gap->ga_data + start; + right = (fold_T *)gap->ga_data + end; + tmp = *left; + *left = *right; + *right = tmp; + } +} + +/* foldMoveRange() {{{2 */ +/* + * Move folds within the inclusive range "line1" to "line2" to after "dest" + * requires "line1" <= "line2" <= "dest" + * + * There are the following situations for the first fold at or below line1 - 1. + * 1 2 3 4 + * 1 2 3 4 + * line1 2 3 4 + * 2 3 4 5 6 7 + * line2 3 4 5 6 7 + * 3 4 6 7 8 9 + * dest 4 7 8 9 + * 4 7 8 10 + * 4 7 8 10 + * + * In the following descriptions, "moved" means moving in the buffer, *and* in + * the fold array. + * Meanwhile, "shifted" just means moving in the buffer. + * 1. not changed + * 2. truncated above line1 + * 3. length reduced by line2 - line1, folds starting between the end of 3 and + * dest are truncated and shifted up + * 4. internal folds moved (from [line1, line2] to dest) + * 5. moved to dest. + * 6. truncated below line2 and moved. + * 7. length reduced by line2 - dest, folds starting between line2 and dest are + * removed, top is moved down by move_len. + * 8. truncated below dest and shifted up. + * 9. shifted up + * 10. not changed + */ + + static void +truncate_fold(fold_T *fp, linenr_T end) +{ + end += 1; + foldRemove(&fp->fd_nested, end - fp->fd_top, MAXLNUM); + fp->fd_len = end - fp->fd_top; +} + +#define fold_end(fp) ((fp)->fd_top + (fp)->fd_len - 1) +#define valid_fold(fp, gap) ((fp) < ((fold_T *)(gap)->ga_data + (gap)->ga_len)) +#define fold_index(fp, gap) ((size_t)(fp - ((fold_T *)(gap)->ga_data))) + + void +foldMoveRange(garray_T *gap, linenr_T line1, linenr_T line2, linenr_T dest) +{ + fold_T *fp; + linenr_T range_len = line2 - line1 + 1; + linenr_T move_len = dest - line2; + int at_start = foldFind(gap, line1 - 1, &fp); + size_t move_start = 0, move_end = 0, dest_index = 0; + + if (at_start) + { + if (fold_end(fp) > dest) + { + /* Case 4 + * don't have to change this fold, but have to move nested folds. + */ + foldMoveRange(&fp->fd_nested, line1 - fp->fd_top, line2 - + fp->fd_top, dest - fp->fd_top); + return; + } + else if (fold_end(fp) > line2) + { + /* Case 3 + * Remove nested folds between line1 and line2 & reduce the + * length of fold by "range_len". + * Folds after this one must be dealt with. + */ + foldMarkAdjustRecurse(&fp->fd_nested, line1 - fp->fd_top, line2 - + fp->fd_top, MAXLNUM, -range_len); + fp->fd_len -= range_len; + } + else + /* Case 2 truncate fold, folds after this one must be dealt with. */ + truncate_fold(fp, line1 - 1); + + /* Look at the next fold, and treat that one as if it were the first + * after "line1" (because now it is). */ + fp = fp + 1; + } + + if (!valid_fold(fp, gap) || fp->fd_top > dest) + { + /* Case 10 + * No folds after "line1" and before "dest" + */ + return; + } + else if (fp->fd_top > line2) + { + for (; valid_fold(fp, gap) && fold_end(fp) <= dest; fp++) + /* Case 9. (for all case 9's) -- shift up. */ + fp->fd_top -= range_len; + + if (valid_fold(fp, gap) && fp->fd_top <= dest) + { + /* Case 8. -- ensure truncated at dest, shift up */ + truncate_fold(fp, dest); + fp->fd_top -= range_len; + } + return; + } + else if (fold_end(fp) > dest) + { + /* Case 7 -- remove nested folds and shrink */ + foldMarkAdjustRecurse(&fp->fd_nested, line2 + 1 - fp->fd_top, dest - + fp->fd_top, MAXLNUM, -move_len); + fp->fd_len -= move_len; + fp->fd_top += move_len; + return; + } + + /* Case 5 or 6 + * changes rely on whether there are folds between the end of + * this fold and "dest". + */ + move_start = fold_index(fp, gap); + + for (; valid_fold(fp, gap) && fp->fd_top <= dest; fp++) + { + if (fp->fd_top <= line2) + { + /* 1. 2. or 3. */ + if (fold_end(fp) > line2) + /* 2. or 3., truncate before moving */ + truncate_fold(fp, line2); + + fp->fd_top += move_len; + continue; + } + + /* Record index of the first fold after the moved range. */ + if (move_end == 0) + move_end = fold_index(fp, gap); + + if (fold_end(fp) > dest) + truncate_fold(fp, dest); + + fp->fd_top -= range_len; + } + + dest_index = fold_index(fp, gap); + + /* + * All folds are now correct, but not necessarily in the correct order. We + * must swap folds in the range [move_end, dest_index) with those in the + * range [move_start, move_end). + */ + if (move_end == 0) + /* There are no folds after those moved, hence no folds have been moved + * out of order. */ + return; + foldReverseOrder(gap, (linenr_T)move_start, (linenr_T)dest_index - 1); + foldReverseOrder(gap, (linenr_T)move_start, + (linenr_T)(move_start + dest_index - move_end - 1)); + foldReverseOrder(gap, (linenr_T)(move_start + dest_index - move_end), + (linenr_T)(dest_index - 1)); +} +#undef fold_end +#undef valid_fold +#undef fold_index + +/* foldMerge() {{{2 */ +/* + * Merge two adjacent folds (and the nested ones in them). + * This only works correctly when the folds are really adjacent! Thus "fp1" + * must end just above "fp2". + * The resulting fold is "fp1", nested folds are moved from "fp2" to "fp1". + * Fold entry "fp2" in "gap" is deleted. + */ + static void +foldMerge(fold_T *fp1, garray_T *gap, fold_T *fp2) +{ + fold_T *fp3; + fold_T *fp4; + int idx; + garray_T *gap1 = &fp1->fd_nested; + garray_T *gap2 = &fp2->fd_nested; + + /* If the last nested fold in fp1 touches the first nested fold in fp2, + * merge them recursively. */ + if (foldFind(gap1, fp1->fd_len - 1L, &fp3) && foldFind(gap2, 0L, &fp4)) + foldMerge(fp3, gap2, fp4); + + /* Move nested folds in fp2 to the end of fp1. */ + if (gap2->ga_len > 0 && ga_grow(gap1, gap2->ga_len) == OK) + { + for (idx = 0; idx < gap2->ga_len; ++idx) + { + ((fold_T *)gap1->ga_data)[gap1->ga_len] + = ((fold_T *)gap2->ga_data)[idx]; + ((fold_T *)gap1->ga_data)[gap1->ga_len].fd_top += fp1->fd_len; + ++gap1->ga_len; + } + gap2->ga_len = 0; + } + + fp1->fd_len += fp2->fd_len; + deleteFoldEntry(gap, (int)(fp2 - (fold_T *)gap->ga_data), TRUE); + fold_changed = TRUE; +} + +/* foldlevelIndent() {{{2 */ +/* + * Low level function to get the foldlevel for the "indent" method. + * Doesn't use any caching. + * Returns a level of -1 if the foldlevel depends on surrounding lines. + */ + static void +foldlevelIndent(fline_T *flp) +{ + char_u *s; + buf_T *buf; + linenr_T lnum = flp->lnum + flp->off; + + buf = flp->wp->w_buffer; + s = skipwhite(ml_get_buf(buf, lnum, FALSE)); + + /* empty line or lines starting with a character in 'foldignore': level + * depends on surrounding lines */ + if (*s == NUL || vim_strchr(flp->wp->w_p_fdi, *s) != NULL) + { + /* first and last line can't be undefined, use level 0 */ + if (lnum == 1 || lnum == buf->b_ml.ml_line_count) + flp->lvl = 0; + else + flp->lvl = -1; + } + else + flp->lvl = get_indent_buf(buf, lnum) / get_sw_value(buf); + if (flp->lvl > flp->wp->w_p_fdn) + { + flp->lvl = flp->wp->w_p_fdn; + if (flp->lvl < 0) + flp->lvl = 0; + } +} + +/* foldlevelDiff() {{{2 */ +#ifdef FEAT_DIFF +/* + * Low level function to get the foldlevel for the "diff" method. + * Doesn't use any caching. + */ + static void +foldlevelDiff(fline_T *flp) +{ + if (diff_infold(flp->wp, flp->lnum + flp->off)) + flp->lvl = 1; + else + flp->lvl = 0; +} +#endif + +/* foldlevelExpr() {{{2 */ +/* + * Low level function to get the foldlevel for the "expr" method. + * Doesn't use any caching. + * Returns a level of -1 if the foldlevel depends on surrounding lines. + */ + static void +foldlevelExpr(fline_T *flp) +{ +#ifndef FEAT_EVAL + flp->start = FALSE; + flp->lvl = 0; +#else + win_T *win; + int n; + int c; + linenr_T lnum = flp->lnum + flp->off; + int save_keytyped; + + win = curwin; + curwin = flp->wp; + curbuf = flp->wp->w_buffer; + set_vim_var_nr(VV_LNUM, lnum); + + flp->start = 0; + flp->had_end = flp->end; + flp->end = MAX_LEVEL + 1; + if (lnum <= 1) + flp->lvl = 0; + + /* KeyTyped may be reset to 0 when calling a function which invokes + * do_cmdline(). To make 'foldopen' work correctly restore KeyTyped. */ + save_keytyped = KeyTyped; + n = (int)eval_foldexpr(flp->wp->w_p_fde, &c); + KeyTyped = save_keytyped; + + switch (c) + { + /* "a1", "a2", .. : add to the fold level */ + case 'a': if (flp->lvl >= 0) + { + flp->lvl += n; + flp->lvl_next = flp->lvl; + } + flp->start = n; + break; + + /* "s1", "s2", .. : subtract from the fold level */ + case 's': if (flp->lvl >= 0) + { + if (n > flp->lvl) + flp->lvl_next = 0; + else + flp->lvl_next = flp->lvl - n; + flp->end = flp->lvl_next + 1; + } + break; + + /* ">1", ">2", .. : start a fold with a certain level */ + case '>': flp->lvl = n; + flp->lvl_next = n; + flp->start = 1; + break; + + /* "<1", "<2", .. : end a fold with a certain level */ + case '<': flp->lvl_next = n - 1; + flp->end = n; + break; + + /* "=": No change in level */ + case '=': flp->lvl_next = flp->lvl; + break; + + /* "-1", "0", "1", ..: set fold level */ + default: if (n < 0) + /* Use the current level for the next line, so that "a1" + * will work there. */ + flp->lvl_next = flp->lvl; + else + flp->lvl_next = n; + flp->lvl = n; + break; + } + + /* If the level is unknown for the first or the last line in the file, use + * level 0. */ + if (flp->lvl < 0) + { + if (lnum <= 1) + { + flp->lvl = 0; + flp->lvl_next = 0; + } + if (lnum == curbuf->b_ml.ml_line_count) + flp->lvl_next = 0; + } + + curwin = win; + curbuf = curwin->w_buffer; +#endif +} + +/* parseMarker() {{{2 */ +/* + * Parse 'foldmarker' and set "foldendmarker", "foldstartmarkerlen" and + * "foldendmarkerlen". + * Relies on the option value to have been checked for correctness already. + */ + static void +parseMarker(win_T *wp) +{ + foldendmarker = vim_strchr(wp->w_p_fmr, ','); + foldstartmarkerlen = (int)(foldendmarker++ - wp->w_p_fmr); + foldendmarkerlen = (int)STRLEN(foldendmarker); +} + +/* foldlevelMarker() {{{2 */ +/* + * Low level function to get the foldlevel for the "marker" method. + * "foldendmarker", "foldstartmarkerlen" and "foldendmarkerlen" must have been + * set before calling this. + * Requires that flp->lvl is set to the fold level of the previous line! + * Careful: This means you can't call this function twice on the same line. + * Doesn't use any caching. + * Sets flp->start when a start marker was found. + */ + static void +foldlevelMarker(fline_T *flp) +{ + char_u *startmarker; + int cstart; + int cend; + int start_lvl = flp->lvl; + char_u *s; + int n; + + /* cache a few values for speed */ + startmarker = flp->wp->w_p_fmr; + cstart = *startmarker; + ++startmarker; + cend = *foldendmarker; + + /* Default: no start found, next level is same as current level */ + flp->start = 0; + flp->lvl_next = flp->lvl; + + s = ml_get_buf(flp->wp->w_buffer, flp->lnum + flp->off, FALSE); + while (*s) + { + if (*s == cstart + && STRNCMP(s + 1, startmarker, foldstartmarkerlen - 1) == 0) + { + /* found startmarker: set flp->lvl */ + s += foldstartmarkerlen; + if (VIM_ISDIGIT(*s)) + { + n = atoi((char *)s); + if (n > 0) + { + flp->lvl = n; + flp->lvl_next = n; + if (n <= start_lvl) + flp->start = 1; + else + flp->start = n - start_lvl; + } + } + else + { + ++flp->lvl; + ++flp->lvl_next; + ++flp->start; + } + } + else if (*s == cend + && STRNCMP(s + 1, foldendmarker + 1, foldendmarkerlen - 1) == 0) + { + /* found endmarker: set flp->lvl_next */ + s += foldendmarkerlen; + if (VIM_ISDIGIT(*s)) + { + n = atoi((char *)s); + if (n > 0) + { + flp->lvl = n; + flp->lvl_next = n - 1; + /* never start a fold with an end marker */ + if (flp->lvl_next > start_lvl) + flp->lvl_next = start_lvl; + } + } + else + --flp->lvl_next; + } + else + MB_PTR_ADV(s); + } + + /* The level can't go negative, must be missing a start marker. */ + if (flp->lvl_next < 0) + flp->lvl_next = 0; +} + +/* foldlevelSyntax() {{{2 */ +/* + * Low level function to get the foldlevel for the "syntax" method. + * Doesn't use any caching. + */ + static void +foldlevelSyntax(fline_T *flp) +{ +#ifndef FEAT_SYN_HL + flp->start = 0; + flp->lvl = 0; +#else + linenr_T lnum = flp->lnum + flp->off; + int n; + + /* Use the maximum fold level at the start of this line and the next. */ + flp->lvl = syn_get_foldlevel(flp->wp, lnum); + flp->start = 0; + if (lnum < flp->wp->w_buffer->b_ml.ml_line_count) + { + n = syn_get_foldlevel(flp->wp, lnum + 1); + if (n > flp->lvl) + { + flp->start = n - flp->lvl; /* fold(s) start here */ + flp->lvl = n; + } + } +#endif +} + +/* functions for storing the fold state in a View {{{1 */ +/* put_folds() {{{2 */ +#if defined(FEAT_SESSION) || defined(PROTO) +static int put_folds_recurse(FILE *fd, garray_T *gap, linenr_T off); +static int put_foldopen_recurse(FILE *fd, win_T *wp, garray_T *gap, linenr_T off); +static int put_fold_open_close(FILE *fd, fold_T *fp, linenr_T off); + +/* + * Write commands to "fd" to restore the manual folds in window "wp". + * Return FAIL if writing fails. + */ + int +put_folds(FILE *fd, win_T *wp) +{ + if (foldmethodIsManual(wp)) + { + if (put_line(fd, "silent! normal! zE") == FAIL + || put_folds_recurse(fd, &wp->w_folds, (linenr_T)0) == FAIL) + return FAIL; + } + + /* If some folds are manually opened/closed, need to restore that. */ + if (wp->w_fold_manual) + return put_foldopen_recurse(fd, wp, &wp->w_folds, (linenr_T)0); + + return OK; +} + +/* put_folds_recurse() {{{2 */ +/* + * Write commands to "fd" to recreate manually created folds. + * Returns FAIL when writing failed. + */ + static int +put_folds_recurse(FILE *fd, garray_T *gap, linenr_T off) +{ + int i; + fold_T *fp; + + fp = (fold_T *)gap->ga_data; + for (i = 0; i < gap->ga_len; i++) + { + /* Do nested folds first, they will be created closed. */ + if (put_folds_recurse(fd, &fp->fd_nested, off + fp->fd_top) == FAIL) + return FAIL; + if (fprintf(fd, "%ld,%ldfold", fp->fd_top + off, + fp->fd_top + off + fp->fd_len - 1) < 0 + || put_eol(fd) == FAIL) + return FAIL; + ++fp; + } + return OK; +} + +/* put_foldopen_recurse() {{{2 */ +/* + * Write commands to "fd" to open and close manually opened/closed folds. + * Returns FAIL when writing failed. + */ + static int +put_foldopen_recurse( + FILE *fd, + win_T *wp, + garray_T *gap, + linenr_T off) +{ + int i; + int level; + fold_T *fp; + + fp = (fold_T *)gap->ga_data; + for (i = 0; i < gap->ga_len; i++) + { + if (fp->fd_flags != FD_LEVEL) + { + if (fp->fd_nested.ga_len > 0) + { + /* open nested folds while this fold is open */ + if (fprintf(fd, "%ld", fp->fd_top + off) < 0 + || put_eol(fd) == FAIL + || put_line(fd, "normal! zo") == FAIL) + return FAIL; + if (put_foldopen_recurse(fd, wp, &fp->fd_nested, + off + fp->fd_top) + == FAIL) + return FAIL; + /* close the parent when needed */ + if (fp->fd_flags == FD_CLOSED) + { + if (put_fold_open_close(fd, fp, off) == FAIL) + return FAIL; + } + } + else + { + /* Open or close the leaf according to the window foldlevel. + * Do not close a leaf that is already closed, as it will close + * the parent. */ + level = foldLevelWin(wp, off + fp->fd_top); + if ((fp->fd_flags == FD_CLOSED && wp->w_p_fdl >= level) + || (fp->fd_flags != FD_CLOSED && wp->w_p_fdl < level)) + if (put_fold_open_close(fd, fp, off) == FAIL) + return FAIL; + } + } + ++fp; + } + + return OK; +} + +/* put_fold_open_close() {{{2 */ +/* + * Write the open or close command to "fd". + * Returns FAIL when writing failed. + */ + static int +put_fold_open_close(FILE *fd, fold_T *fp, linenr_T off) +{ + if (fprintf(fd, "%ld", fp->fd_top + off) < 0 + || put_eol(fd) == FAIL + || fprintf(fd, "normal! z%c", + fp->fd_flags == FD_CLOSED ? 'c' : 'o') < 0 + || put_eol(fd) == FAIL) + return FAIL; + + return OK; +} +#endif /* FEAT_SESSION */ + +/* }}}1 */ +#endif /* defined(FEAT_FOLDING) || defined(PROTO) */ |