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Diffstat (limited to 'src/textformat.c')
| -rw-r--r-- | src/textformat.c | 1150 |
1 files changed, 1150 insertions, 0 deletions
diff --git a/src/textformat.c b/src/textformat.c new file mode 100644 index 0000000..9b96b7f --- /dev/null +++ b/src/textformat.c @@ -0,0 +1,1150 @@ +/* vi:set ts=8 sts=4 sw=4 noet: + * + * 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. + */ + +/* + * textformat.c: text formatting functions + */ + +#include "vim.h" + +static int did_add_space = FALSE; // auto_format() added an extra space + // under the cursor + +#define WHITECHAR(cc) (VIM_ISWHITE(cc) && (!enc_utf8 || !utf_iscomposing(utf_ptr2char(ml_get_cursor() + 1)))) + +/* + * Return TRUE if format option 'x' is in effect. + * Take care of no formatting when 'paste' is set. + */ + int +has_format_option(int x) +{ + if (p_paste) + return FALSE; + return (vim_strchr(curbuf->b_p_fo, x) != NULL); +} + +/* + * Format text at the current insert position. + * + * If the INSCHAR_COM_LIST flag is present, then the value of second_indent + * will be the comment leader length sent to open_line(). + */ + void +internal_format( + int textwidth, + int second_indent, + int flags, + int format_only, + int c) // character to be inserted (can be NUL) +{ + int cc; + int skip_pos; + int save_char = NUL; + int haveto_redraw = FALSE; + int fo_ins_blank = has_format_option(FO_INS_BLANK); + int fo_multibyte = has_format_option(FO_MBYTE_BREAK); + int fo_rigor_tw = has_format_option(FO_RIGOROUS_TW); + int fo_white_par = has_format_option(FO_WHITE_PAR); + int first_line = TRUE; + colnr_T leader_len; + int no_leader = FALSE; + int do_comments = (flags & INSCHAR_DO_COM); +#ifdef FEAT_LINEBREAK + int has_lbr = curwin->w_p_lbr; + + // make sure win_lbr_chartabsize() counts correctly + curwin->w_p_lbr = FALSE; +#endif + + // When 'ai' is off we don't want a space under the cursor to be + // deleted. Replace it with an 'x' temporarily. + if (!curbuf->b_p_ai && !(State & VREPLACE_FLAG)) + { + cc = gchar_cursor(); + if (VIM_ISWHITE(cc)) + { + save_char = cc; + pchar_cursor('x'); + } + } + + // Repeat breaking lines, until the current line is not too long. + while (!got_int) + { + int startcol; // Cursor column at entry + int wantcol; // column at textwidth border + int foundcol; // column for start of spaces + int end_foundcol = 0; // column for start of word + colnr_T len; + colnr_T virtcol; + int orig_col = 0; + char_u *saved_text = NULL; + colnr_T col; + colnr_T end_col; + int wcc; // counter for whitespace chars + + virtcol = get_nolist_virtcol() + + char2cells(c != NUL ? c : gchar_cursor()); + if (virtcol <= (colnr_T)textwidth) + break; + + if (no_leader) + do_comments = FALSE; + else if (!(flags & INSCHAR_FORMAT) + && has_format_option(FO_WRAP_COMS)) + do_comments = TRUE; + + // Don't break until after the comment leader + if (do_comments) + leader_len = get_leader_len(ml_get_curline(), NULL, FALSE, TRUE); + else + leader_len = 0; + + // If the line doesn't start with a comment leader, then don't + // start one in a following broken line. Avoids that a %word + // moved to the start of the next line causes all following lines + // to start with %. + if (leader_len == 0) + no_leader = TRUE; + if (!(flags & INSCHAR_FORMAT) + && leader_len == 0 + && !has_format_option(FO_WRAP)) + + break; + if ((startcol = curwin->w_cursor.col) == 0) + break; + + // find column of textwidth border + coladvance((colnr_T)textwidth); + wantcol = curwin->w_cursor.col; + + curwin->w_cursor.col = startcol; + foundcol = 0; + skip_pos = 0; + + // Find position to break at. + // Stop at first entered white when 'formatoptions' has 'v' + while ((!fo_ins_blank && !has_format_option(FO_INS_VI)) + || (flags & INSCHAR_FORMAT) + || curwin->w_cursor.lnum != Insstart.lnum + || curwin->w_cursor.col >= Insstart.col) + { + if (curwin->w_cursor.col == startcol && c != NUL) + cc = c; + else + cc = gchar_cursor(); + if (WHITECHAR(cc)) + { + // remember position of blank just before text + end_col = curwin->w_cursor.col; + + // find start of sequence of blanks + wcc = 0; + while (curwin->w_cursor.col > 0 && WHITECHAR(cc)) + { + dec_cursor(); + cc = gchar_cursor(); + + // Increment count of how many whitespace chars in this + // group; we only need to know if it's more than one. + if (wcc < 2) + wcc++; + } + if (curwin->w_cursor.col == 0 && WHITECHAR(cc)) + break; // only spaces in front of text + + // Don't break after a period when 'formatoptions' has 'p' and + // there are less than two spaces. + if (has_format_option(FO_PERIOD_ABBR) && cc == '.' && wcc < 2) + continue; + + // Don't break until after the comment leader + if (curwin->w_cursor.col < leader_len) + break; + if (has_format_option(FO_ONE_LETTER)) + { + // do not break after one-letter words + if (curwin->w_cursor.col == 0) + break; // one-letter word at begin + // do not break "#a b" when 'tw' is 2 + if (curwin->w_cursor.col <= leader_len) + break; + col = curwin->w_cursor.col; + dec_cursor(); + cc = gchar_cursor(); + + if (WHITECHAR(cc)) + continue; // one-letter, continue + curwin->w_cursor.col = col; + } + + inc_cursor(); + + end_foundcol = end_col + 1; + foundcol = curwin->w_cursor.col; + if (curwin->w_cursor.col <= (colnr_T)wantcol) + break; + } + else if ((cc >= 0x100 || !utf_allow_break_before(cc)) && fo_multibyte) + { + int ncc; + int allow_break; + + // Break after or before a multi-byte character. + if (curwin->w_cursor.col != startcol) + { + // Don't break until after the comment leader + if (curwin->w_cursor.col < leader_len) + break; + col = curwin->w_cursor.col; + inc_cursor(); + ncc = gchar_cursor(); + + allow_break = + (enc_utf8 && utf_allow_break(cc, ncc)) + || enc_dbcs; + + // If we have already checked this position, skip! + if (curwin->w_cursor.col != skip_pos && allow_break) + { + foundcol = curwin->w_cursor.col; + end_foundcol = foundcol; + if (curwin->w_cursor.col <= (colnr_T)wantcol) + break; + } + curwin->w_cursor.col = col; + } + + if (curwin->w_cursor.col == 0) + break; + + ncc = cc; + col = curwin->w_cursor.col; + + dec_cursor(); + cc = gchar_cursor(); + + if (WHITECHAR(cc)) + continue; // break with space + // Don't break until after the comment leader. + if (curwin->w_cursor.col < leader_len) + break; + + curwin->w_cursor.col = col; + skip_pos = curwin->w_cursor.col; + + allow_break = + (enc_utf8 && utf_allow_break(cc, ncc)) + || enc_dbcs; + + // Must handle this to respect line break prohibition. + if (allow_break) + { + foundcol = curwin->w_cursor.col; + end_foundcol = foundcol; + } + if (curwin->w_cursor.col <= (colnr_T)wantcol) + { + int ncc_allow_break = + (enc_utf8 && utf_allow_break_before(ncc)) || enc_dbcs; + + if (allow_break) + break; + if (!ncc_allow_break && !fo_rigor_tw) + { + // Enable at most 1 punct hang outside of textwidth. + if (curwin->w_cursor.col == startcol) + { + // We are inserting a non-breakable char, postpone + // line break check to next insert. + end_foundcol = foundcol = 0; + break; + } + + // Neither cc nor ncc is NUL if we are here, so + // it's safe to inc_cursor. + col = curwin->w_cursor.col; + + inc_cursor(); + cc = ncc; + ncc = gchar_cursor(); + // handle insert + ncc = (ncc != NUL) ? ncc : c; + + allow_break = + (enc_utf8 && utf_allow_break(cc, ncc)) + || enc_dbcs; + + if (allow_break) + { + // Break only when we are not at end of line. + end_foundcol = foundcol = + ncc == NUL? 0 : curwin->w_cursor.col; + break; + } + curwin->w_cursor.col = col; + } + } + } + if (curwin->w_cursor.col == 0) + break; + dec_cursor(); + } + + if (foundcol == 0) // no spaces, cannot break line + { + curwin->w_cursor.col = startcol; + break; + } + + // Going to break the line, remove any "$" now. + undisplay_dollar(); + + // Offset between cursor position and line break is used by replace + // stack functions. VREPLACE does not use this, and backspaces + // over the text instead. + if (State & VREPLACE_FLAG) + orig_col = startcol; // Will start backspacing from here + else + replace_offset = startcol - end_foundcol; + + // adjust startcol for spaces that will be deleted and + // characters that will remain on top line + curwin->w_cursor.col = foundcol; + while ((cc = gchar_cursor(), WHITECHAR(cc)) + && (!fo_white_par || curwin->w_cursor.col < startcol)) + inc_cursor(); + startcol -= curwin->w_cursor.col; + if (startcol < 0) + startcol = 0; + + if (State & VREPLACE_FLAG) + { + // In VREPLACE mode, we will backspace over the text to be + // wrapped, so save a copy now to put on the next line. + saved_text = vim_strsave(ml_get_cursor()); + curwin->w_cursor.col = orig_col; + if (saved_text == NULL) + break; // Can't do it, out of memory + saved_text[startcol] = NUL; + + // Backspace over characters that will move to the next line + if (!fo_white_par) + backspace_until_column(foundcol); + } + else + { + // put cursor after pos. to break line + if (!fo_white_par) + curwin->w_cursor.col = foundcol; + } + + // Split the line just before the margin. + // Only insert/delete lines, but don't really redraw the window. + open_line(FORWARD, OPENLINE_DELSPACES + OPENLINE_MARKFIX + + (fo_white_par ? OPENLINE_KEEPTRAIL : 0) + + (do_comments ? OPENLINE_DO_COM : 0) + + ((flags & INSCHAR_COM_LIST) ? OPENLINE_COM_LIST : 0) + , ((flags & INSCHAR_COM_LIST) ? second_indent : old_indent)); + if (!(flags & INSCHAR_COM_LIST)) + old_indent = 0; + + replace_offset = 0; + if (first_line) + { + if (!(flags & INSCHAR_COM_LIST)) + { + // This section is for auto-wrap of numeric lists. When not + // in insert mode (i.e. format_lines()), the INSCHAR_COM_LIST + // flag will be set and open_line() will handle it (as seen + // above). The code here (and in get_number_indent()) will + // recognize comments if needed... + if (second_indent < 0 && has_format_option(FO_Q_NUMBER)) + second_indent = + get_number_indent(curwin->w_cursor.lnum - 1); + if (second_indent >= 0) + { + if (State & VREPLACE_FLAG) + change_indent(INDENT_SET, second_indent, + FALSE, NUL, TRUE); + else + if (leader_len > 0 && second_indent - leader_len > 0) + { + int i; + int padding = second_indent - leader_len; + + // We started at the first_line of a numbered list + // that has a comment. the open_line() function has + // inserted the proper comment leader and positioned + // the cursor at the end of the split line. Now we + // add the additional whitespace needed after the + // comment leader for the numbered list. + for (i = 0; i < padding; i++) + ins_str((char_u *)" "); + } + else + { + (void)set_indent(second_indent, SIN_CHANGED); + } + } + } + first_line = FALSE; + } + + if (State & VREPLACE_FLAG) + { + // In VREPLACE mode we have backspaced over the text to be + // moved, now we re-insert it into the new line. + ins_bytes(saved_text); + vim_free(saved_text); + } + else + { + // Check if cursor is not past the NUL off the line, cindent + // may have added or removed indent. + curwin->w_cursor.col += startcol; + len = (colnr_T)STRLEN(ml_get_curline()); + if (curwin->w_cursor.col > len) + curwin->w_cursor.col = len; + } + + haveto_redraw = TRUE; +#ifdef FEAT_CINDENT + set_can_cindent(TRUE); +#endif + // moved the cursor, don't autoindent or cindent now + did_ai = FALSE; +#ifdef FEAT_SMARTINDENT + did_si = FALSE; + can_si = FALSE; + can_si_back = FALSE; +#endif + line_breakcheck(); + } + + if (save_char != NUL) // put back space after cursor + pchar_cursor(save_char); + +#ifdef FEAT_LINEBREAK + curwin->w_p_lbr = has_lbr; +#endif + if (!format_only && haveto_redraw) + { + update_topline(); + redraw_curbuf_later(VALID); + } +} + +/* + * Blank lines, and lines containing only the comment leader, are left + * untouched by the formatting. The function returns TRUE in this + * case. It also returns TRUE when a line starts with the end of a comment + * ('e' in comment flags), so that this line is skipped, and not joined to the + * previous line. A new paragraph starts after a blank line, or when the + * comment leader changes -- webb. + */ + static int +fmt_check_par( + linenr_T lnum, + int *leader_len, + char_u **leader_flags, + int do_comments) +{ + char_u *flags = NULL; // init for GCC + char_u *ptr; + + ptr = ml_get(lnum); + if (do_comments) + *leader_len = get_leader_len(ptr, leader_flags, FALSE, TRUE); + else + *leader_len = 0; + + if (*leader_len > 0) + { + // Search for 'e' flag in comment leader flags. + flags = *leader_flags; + while (*flags && *flags != ':' && *flags != COM_END) + ++flags; + } + + return (*skipwhite(ptr + *leader_len) == NUL + || (*leader_len > 0 && *flags == COM_END) + || startPS(lnum, NUL, FALSE)); +} + +/* + * Return TRUE if line "lnum" ends in a white character. + */ + static int +ends_in_white(linenr_T lnum) +{ + char_u *s = ml_get(lnum); + size_t l; + + if (*s == NUL) + return FALSE; + // Don't use STRLEN() inside VIM_ISWHITE(), SAS/C complains: "macro + // invocation may call function multiple times". + l = STRLEN(s) - 1; + return VIM_ISWHITE(s[l]); +} + +/* + * Return TRUE if the two comment leaders given are the same. "lnum" is + * the first line. White-space is ignored. Note that the whole of + * 'leader1' must match 'leader2_len' characters from 'leader2' -- webb + */ + static int +same_leader( + linenr_T lnum, + int leader1_len, + char_u *leader1_flags, + int leader2_len, + char_u *leader2_flags) +{ + int idx1 = 0, idx2 = 0; + char_u *p; + char_u *line1; + char_u *line2; + + if (leader1_len == 0) + return (leader2_len == 0); + + // If first leader has 'f' flag, the lines can be joined only if the + // second line does not have a leader. + // If first leader has 'e' flag, the lines can never be joined. + // If fist leader has 's' flag, the lines can only be joined if there is + // some text after it and the second line has the 'm' flag. + if (leader1_flags != NULL) + { + for (p = leader1_flags; *p && *p != ':'; ++p) + { + if (*p == COM_FIRST) + return (leader2_len == 0); + if (*p == COM_END) + return FALSE; + if (*p == COM_START) + { + if (*(ml_get(lnum) + leader1_len) == NUL) + return FALSE; + if (leader2_flags == NULL || leader2_len == 0) + return FALSE; + for (p = leader2_flags; *p && *p != ':'; ++p) + if (*p == COM_MIDDLE) + return TRUE; + return FALSE; + } + } + } + + // Get current line and next line, compare the leaders. + // The first line has to be saved, only one line can be locked at a time. + line1 = vim_strsave(ml_get(lnum)); + if (line1 != NULL) + { + for (idx1 = 0; VIM_ISWHITE(line1[idx1]); ++idx1) + ; + line2 = ml_get(lnum + 1); + for (idx2 = 0; idx2 < leader2_len; ++idx2) + { + if (!VIM_ISWHITE(line2[idx2])) + { + if (line1[idx1++] != line2[idx2]) + break; + } + else + while (VIM_ISWHITE(line1[idx1])) + ++idx1; + } + vim_free(line1); + } + return (idx2 == leader2_len && idx1 == leader1_len); +} + +/* + * Return TRUE when a paragraph starts in line "lnum". Return FALSE when the + * previous line is in the same paragraph. Used for auto-formatting. + */ + static int +paragraph_start(linenr_T lnum) +{ + char_u *p; + int leader_len = 0; // leader len of current line + char_u *leader_flags = NULL; // flags for leader of current line + int next_leader_len; // leader len of next line + char_u *next_leader_flags; // flags for leader of next line + int do_comments; // format comments + + if (lnum <= 1) + return TRUE; // start of the file + + p = ml_get(lnum - 1); + if (*p == NUL) + return TRUE; // after empty line + + do_comments = has_format_option(FO_Q_COMS); + if (fmt_check_par(lnum - 1, &leader_len, &leader_flags, do_comments)) + return TRUE; // after non-paragraph line + + if (fmt_check_par(lnum, &next_leader_len, &next_leader_flags, do_comments)) + return TRUE; // "lnum" is not a paragraph line + + if (has_format_option(FO_WHITE_PAR) && !ends_in_white(lnum - 1)) + return TRUE; // missing trailing space in previous line. + + if (has_format_option(FO_Q_NUMBER) && (get_number_indent(lnum) > 0)) + return TRUE; // numbered item starts in "lnum". + + if (!same_leader(lnum - 1, leader_len, leader_flags, + next_leader_len, next_leader_flags)) + return TRUE; // change of comment leader. + + return FALSE; +} + +/* + * Called after inserting or deleting text: When 'formatoptions' includes the + * 'a' flag format from the current line until the end of the paragraph. + * Keep the cursor at the same position relative to the text. + * The caller must have saved the cursor line for undo, following ones will be + * saved here. + */ + void +auto_format( + int trailblank, // when TRUE also format with trailing blank + int prev_line) // may start in previous line +{ + pos_T pos; + colnr_T len; + char_u *old; + char_u *new, *pnew; + int wasatend; + int cc; + + if (!has_format_option(FO_AUTO)) + return; + + pos = curwin->w_cursor; + old = ml_get_curline(); + + // may remove added space + check_auto_format(FALSE); + + // Don't format in Insert mode when the cursor is on a trailing blank, the + // user might insert normal text next. Also skip formatting when "1" is + // in 'formatoptions' and there is a single character before the cursor. + // Otherwise the line would be broken and when typing another non-white + // next they are not joined back together. + wasatend = (pos.col == (colnr_T)STRLEN(old)); + if (*old != NUL && !trailblank && wasatend) + { + dec_cursor(); + cc = gchar_cursor(); + if (!WHITECHAR(cc) && curwin->w_cursor.col > 0 + && has_format_option(FO_ONE_LETTER)) + dec_cursor(); + cc = gchar_cursor(); + if (WHITECHAR(cc)) + { + curwin->w_cursor = pos; + return; + } + curwin->w_cursor = pos; + } + + // With the 'c' flag in 'formatoptions' and 't' missing: only format + // comments. + if (has_format_option(FO_WRAP_COMS) && !has_format_option(FO_WRAP) + && get_leader_len(old, NULL, FALSE, TRUE) == 0) + return; + + // May start formatting in a previous line, so that after "x" a word is + // moved to the previous line if it fits there now. Only when this is not + // the start of a paragraph. + if (prev_line && !paragraph_start(curwin->w_cursor.lnum)) + { + --curwin->w_cursor.lnum; + if (u_save_cursor() == FAIL) + return; + } + + // Do the formatting and restore the cursor position. "saved_cursor" will + // be adjusted for the text formatting. + saved_cursor = pos; + format_lines((linenr_T)-1, FALSE); + curwin->w_cursor = saved_cursor; + saved_cursor.lnum = 0; + + if (curwin->w_cursor.lnum > curbuf->b_ml.ml_line_count) + { + // "cannot happen" + curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count; + coladvance((colnr_T)MAXCOL); + } + else + check_cursor_col(); + + // Insert mode: If the cursor is now after the end of the line while it + // previously wasn't, the line was broken. Because of the rule above we + // need to add a space when 'w' is in 'formatoptions' to keep a paragraph + // formatted. + if (!wasatend && has_format_option(FO_WHITE_PAR)) + { + new = ml_get_curline(); + len = (colnr_T)STRLEN(new); + if (curwin->w_cursor.col == len) + { + pnew = vim_strnsave(new, len + 2); + pnew[len] = ' '; + pnew[len + 1] = NUL; + ml_replace(curwin->w_cursor.lnum, pnew, FALSE); + // remove the space later + did_add_space = TRUE; + } + else + // may remove added space + check_auto_format(FALSE); + } + + check_cursor(); +} + +/* + * When an extra space was added to continue a paragraph for auto-formatting, + * delete it now. The space must be under the cursor, just after the insert + * position. + */ + void +check_auto_format( + int end_insert) // TRUE when ending Insert mode +{ + int c = ' '; + int cc; + + if (did_add_space) + { + cc = gchar_cursor(); + if (!WHITECHAR(cc)) + // Somehow the space was removed already. + did_add_space = FALSE; + else + { + if (!end_insert) + { + inc_cursor(); + c = gchar_cursor(); + dec_cursor(); + } + if (c != NUL) + { + // The space is no longer at the end of the line, delete it. + del_char(FALSE); + did_add_space = FALSE; + } + } + } +} + +/* + * Find out textwidth to be used for formatting: + * if 'textwidth' option is set, use it + * else if 'wrapmargin' option is set, use curwin->w_width - 'wrapmargin' + * if invalid value, use 0. + * Set default to window width (maximum 79) for "gq" operator. + */ + int +comp_textwidth( + int ff) // force formatting (for "gq" command) +{ + int textwidth; + + textwidth = curbuf->b_p_tw; + if (textwidth == 0 && curbuf->b_p_wm) + { + // The width is the window width minus 'wrapmargin' minus all the + // things that add to the margin. + textwidth = curwin->w_width - curbuf->b_p_wm; +#ifdef FEAT_CMDWIN + if (cmdwin_type != 0) + textwidth -= 1; +#endif +#ifdef FEAT_FOLDING + textwidth -= curwin->w_p_fdc; +#endif +#ifdef FEAT_SIGNS + if (signcolumn_on(curwin)) + textwidth -= 1; +#endif + if (curwin->w_p_nu || curwin->w_p_rnu) + textwidth -= 8; + } + if (textwidth < 0) + textwidth = 0; + if (ff && textwidth == 0) + { + textwidth = curwin->w_width - 1; + if (textwidth > 79) + textwidth = 79; + } + return textwidth; +} + +/* + * Implementation of the format operator 'gq'. + */ + void +op_format( + oparg_T *oap, + int keep_cursor) // keep cursor on same text char +{ + long old_line_count = curbuf->b_ml.ml_line_count; + + // Place the cursor where the "gq" or "gw" command was given, so that "u" + // can put it back there. + curwin->w_cursor = oap->cursor_start; + + if (u_save((linenr_T)(oap->start.lnum - 1), + (linenr_T)(oap->end.lnum + 1)) == FAIL) + return; + curwin->w_cursor = oap->start; + + if (oap->is_VIsual) + // When there is no change: need to remove the Visual selection + redraw_curbuf_later(INVERTED); + + if ((cmdmod.cmod_flags & CMOD_LOCKMARKS) == 0) + // Set '[ mark at the start of the formatted area + curbuf->b_op_start = oap->start; + + // For "gw" remember the cursor position and put it back below (adjusted + // for joined and split lines). + if (keep_cursor) + saved_cursor = oap->cursor_start; + + format_lines(oap->line_count, keep_cursor); + + // Leave the cursor at the first non-blank of the last formatted line. + // If the cursor was moved one line back (e.g. with "Q}") go to the next + // line, so "." will do the next lines. + if (oap->end_adjusted && curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count) + ++curwin->w_cursor.lnum; + beginline(BL_WHITE | BL_FIX); + old_line_count = curbuf->b_ml.ml_line_count - old_line_count; + msgmore(old_line_count); + + if ((cmdmod.cmod_flags & CMOD_LOCKMARKS) == 0) + // put '] mark on the end of the formatted area + curbuf->b_op_end = curwin->w_cursor; + + if (keep_cursor) + { + curwin->w_cursor = saved_cursor; + saved_cursor.lnum = 0; + } + + if (oap->is_VIsual) + { + win_T *wp; + + FOR_ALL_WINDOWS(wp) + { + if (wp->w_old_cursor_lnum != 0) + { + // When lines have been inserted or deleted, adjust the end of + // the Visual area to be redrawn. + if (wp->w_old_cursor_lnum > wp->w_old_visual_lnum) + wp->w_old_cursor_lnum += old_line_count; + else + wp->w_old_visual_lnum += old_line_count; + } + } + } +} + +#if defined(FEAT_EVAL) || defined(PROTO) +/* + * Implementation of the format operator 'gq' for when using 'formatexpr'. + */ + void +op_formatexpr(oparg_T *oap) +{ + if (oap->is_VIsual) + // When there is no change: need to remove the Visual selection + redraw_curbuf_later(INVERTED); + + if (fex_format(oap->start.lnum, oap->line_count, NUL) != 0) + // As documented: when 'formatexpr' returns non-zero fall back to + // internal formatting. + op_format(oap, FALSE); +} + + int +fex_format( + linenr_T lnum, + long count, + int c) // character to be inserted +{ + int use_sandbox = was_set_insecurely((char_u *)"formatexpr", + OPT_LOCAL); + int r; + char_u *fex; + + // Set v:lnum to the first line number and v:count to the number of lines. + // Set v:char to the character to be inserted (can be NUL). + set_vim_var_nr(VV_LNUM, lnum); + set_vim_var_nr(VV_COUNT, count); + set_vim_var_char(c); + + // Make a copy, the option could be changed while calling it. + fex = vim_strsave(curbuf->b_p_fex); + if (fex == NULL) + return 0; + + // Evaluate the function. + if (use_sandbox) + ++sandbox; + r = (int)eval_to_number(fex); + if (use_sandbox) + --sandbox; + + set_vim_var_string(VV_CHAR, NULL, -1); + vim_free(fex); + + return r; +} +#endif + +/* + * Format "line_count" lines, starting at the cursor position. + * When "line_count" is negative, format until the end of the paragraph. + * Lines after the cursor line are saved for undo, caller must have saved the + * first line. + */ + void +format_lines( + linenr_T line_count, + int avoid_fex) // don't use 'formatexpr' +{ + int max_len; + int is_not_par; // current line not part of parag. + int next_is_not_par; // next line not part of paragraph + int is_end_par; // at end of paragraph + int prev_is_end_par = FALSE;// prev. line not part of parag. + int next_is_start_par = FALSE; + int leader_len = 0; // leader len of current line + int next_leader_len; // leader len of next line + char_u *leader_flags = NULL; // flags for leader of current line + char_u *next_leader_flags; // flags for leader of next line + int do_comments; // format comments + int do_comments_list = 0; // format comments with 'n' or '2' + int advance = TRUE; + int second_indent = -1; // indent for second line (comment + // aware) + int do_second_indent; + int do_number_indent; + int do_trail_white; + int first_par_line = TRUE; + int smd_save; + long count; + int need_set_indent = TRUE; // set indent of next paragraph + int force_format = FALSE; + int old_State = State; + + // length of a line to force formatting: 3 * 'tw' + max_len = comp_textwidth(TRUE) * 3; + + // check for 'q', '2' and '1' in 'formatoptions' + do_comments = has_format_option(FO_Q_COMS); + do_second_indent = has_format_option(FO_Q_SECOND); + do_number_indent = has_format_option(FO_Q_NUMBER); + do_trail_white = has_format_option(FO_WHITE_PAR); + + // Get info about the previous and current line. + if (curwin->w_cursor.lnum > 1) + is_not_par = fmt_check_par(curwin->w_cursor.lnum - 1 + , &leader_len, &leader_flags, do_comments); + else + is_not_par = TRUE; + next_is_not_par = fmt_check_par(curwin->w_cursor.lnum + , &next_leader_len, &next_leader_flags, do_comments); + is_end_par = (is_not_par || next_is_not_par); + if (!is_end_par && do_trail_white) + is_end_par = !ends_in_white(curwin->w_cursor.lnum - 1); + + curwin->w_cursor.lnum--; + for (count = line_count; count != 0 && !got_int; --count) + { + // Advance to next paragraph. + if (advance) + { + curwin->w_cursor.lnum++; + prev_is_end_par = is_end_par; + is_not_par = next_is_not_par; + leader_len = next_leader_len; + leader_flags = next_leader_flags; + } + + // The last line to be formatted. + if (count == 1 || curwin->w_cursor.lnum == curbuf->b_ml.ml_line_count) + { + next_is_not_par = TRUE; + next_leader_len = 0; + next_leader_flags = NULL; + } + else + { + next_is_not_par = fmt_check_par(curwin->w_cursor.lnum + 1 + , &next_leader_len, &next_leader_flags, do_comments); + if (do_number_indent) + next_is_start_par = + (get_number_indent(curwin->w_cursor.lnum + 1) > 0); + } + advance = TRUE; + is_end_par = (is_not_par || next_is_not_par || next_is_start_par); + if (!is_end_par && do_trail_white) + is_end_par = !ends_in_white(curwin->w_cursor.lnum); + + // Skip lines that are not in a paragraph. + if (is_not_par) + { + if (line_count < 0) + break; + } + else + { + // For the first line of a paragraph, check indent of second line. + // Don't do this for comments and empty lines. + if (first_par_line + && (do_second_indent || do_number_indent) + && prev_is_end_par + && curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count) + { + if (do_second_indent && !LINEEMPTY(curwin->w_cursor.lnum + 1)) + { + if (leader_len == 0 && next_leader_len == 0) + { + // no comment found + second_indent = + get_indent_lnum(curwin->w_cursor.lnum + 1); + } + else + { + second_indent = next_leader_len; + do_comments_list = 1; + } + } + else if (do_number_indent) + { + if (leader_len == 0 && next_leader_len == 0) + { + // no comment found + second_indent = + get_number_indent(curwin->w_cursor.lnum); + } + else + { + // get_number_indent() is now "comment aware"... + second_indent = + get_number_indent(curwin->w_cursor.lnum); + do_comments_list = 1; + } + } + } + + // When the comment leader changes, it's the end of the paragraph. + if (curwin->w_cursor.lnum >= curbuf->b_ml.ml_line_count + || !same_leader(curwin->w_cursor.lnum, + leader_len, leader_flags, + next_leader_len, next_leader_flags)) + is_end_par = TRUE; + + // If we have got to the end of a paragraph, or the line is + // getting long, format it. + if (is_end_par || force_format) + { + if (need_set_indent) + // replace indent in first line with minimal number of + // tabs and spaces, according to current options + (void)set_indent(get_indent(), SIN_CHANGED); + + // put cursor on last non-space + State = NORMAL; // don't go past end-of-line + coladvance((colnr_T)MAXCOL); + while (curwin->w_cursor.col && vim_isspace(gchar_cursor())) + dec_cursor(); + + // do the formatting, without 'showmode' + State = INSERT; // for open_line() + smd_save = p_smd; + p_smd = FALSE; + insertchar(NUL, INSCHAR_FORMAT + + (do_comments ? INSCHAR_DO_COM : 0) + + (do_comments && do_comments_list + ? INSCHAR_COM_LIST : 0) + + (avoid_fex ? INSCHAR_NO_FEX : 0), second_indent); + State = old_State; + p_smd = smd_save; + second_indent = -1; + // at end of par.: need to set indent of next par. + need_set_indent = is_end_par; + if (is_end_par) + { + // When called with a negative line count, break at the + // end of the paragraph. + if (line_count < 0) + break; + first_par_line = TRUE; + } + force_format = FALSE; + } + + // When still in same paragraph, join the lines together. But + // first delete the leader from the second line. + if (!is_end_par) + { + advance = FALSE; + curwin->w_cursor.lnum++; + curwin->w_cursor.col = 0; + if (line_count < 0 && u_save_cursor() == FAIL) + break; + if (next_leader_len > 0) + { + (void)del_bytes((long)next_leader_len, FALSE, FALSE); + mark_col_adjust(curwin->w_cursor.lnum, (colnr_T)0, 0L, + (long)-next_leader_len, 0); + } + else if (second_indent > 0) // the "leader" for FO_Q_SECOND + { + int indent = getwhitecols_curline(); + + if (indent > 0) + { + (void)del_bytes(indent, FALSE, FALSE); + mark_col_adjust(curwin->w_cursor.lnum, + (colnr_T)0, 0L, (long)-indent, 0); + } + } + curwin->w_cursor.lnum--; + if (do_join(2, TRUE, FALSE, FALSE, FALSE) == FAIL) + { + beep_flush(); + break; + } + first_par_line = FALSE; + // If the line is getting long, format it next time + if (STRLEN(ml_get_curline()) > (size_t)max_len) + force_format = TRUE; + else + force_format = FALSE; + } + } + line_breakcheck(); + } +} |