1 files changed, 454 insertions, 0 deletions

diff --git a/libsmartcols/src/calculate.c b/libsmartcols/src/calculate.c
new file mode 100644
index 0000000..b6137fd
--- /dev/null
+++ b/libsmartcols/src/calculate.c
@@ -0,0 +1,454 @@
+#include "smartcolsP.h"
+#include "mbsalign.h"
+
+static void dbg_column(struct libscols_table *tb, struct libscols_column *cl)
+{
+	if (scols_column_is_hidden(cl)) {
+		DBG(COL, ul_debugobj(cl, "%s (hidden) ignored", cl->header.data));
+		return;
+	}
+
+	DBG(COL, ul_debugobj(cl, "%15s seq=%zu, width=%zd, "
+				 "hint=%d, avg=%zu, max=%zu, min=%zu, "
+				 "extreme=%s %s",
+
+		cl->header.data, cl->seqnum, cl->width,
+		cl->width_hint > 1 ? (int) cl->width_hint :
+				     (int) (cl->width_hint * tb->termwidth),
+		cl->width_avg,
+		cl->width_max,
+		cl->width_min,
+		cl->is_extreme ? "yes" : "not",
+		cl->flags & SCOLS_FL_TRUNC ? "trunc" : ""));
+}
+
+static void dbg_columns(struct libscols_table *tb)
+{
+	struct libscols_iter itr;
+	struct libscols_column *cl;
+
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0)
+		dbg_column(tb, cl);
+}
+
+static int count_cell_width(struct libscols_table *tb,
+		struct libscols_line *ln,
+		struct libscols_column *cl,
+		struct libscols_buffer *buf)
+{
+	size_t len;
+	char *data;
+	int rc;
+
+	rc = __cell_to_buffer(tb, ln, cl, buf);
+	if (rc)
+		return rc;
+
+	data = buffer_get_data(buf);
+	if (!data)
+		len = 0;
+	else if (scols_column_is_customwrap(cl))
+		len = cl->wrap_chunksize(cl, data, cl->wrapfunc_data);
+	else if (scols_table_is_noencoding(tb))
+		len = mbs_width(data);
+	else
+		len = mbs_safe_width(data);
+
+	if (len == (size_t) -1)		/* ignore broken multibyte strings */
+		len = 0;
+	cl->width_max = max(len, cl->width_max);
+
+	if (cl->is_extreme && cl->width_avg && len > cl->width_avg * 2)
+		return 0;
+
+	if (scols_column_is_noextremes(cl)) {
+		cl->extreme_sum += len;
+		cl->extreme_count++;
+	}
+	cl->width = max(len, cl->width);
+	if (scols_column_is_tree(cl)) {
+		size_t treewidth = buffer_get_safe_art_size(buf);
+		cl->width_treeart = max(cl->width_treeart, treewidth);
+	}
+	return 0;
+}
+
+
+static int walk_count_cell_width(struct libscols_table *tb,
+		struct libscols_line *ln,
+		struct libscols_column *cl,
+		void *data)
+{
+	return count_cell_width(tb, ln, cl, (struct libscols_buffer *) data);
+}
+
+/*
+ * This function counts column width.
+ *
+ * For the SCOLS_FL_NOEXTREMES columns it is possible to call this function
+ * two times. The first pass counts the width and average width. If the column
+ * contains fields that are too large (a width greater than 2 * average) then
+ * the column is marked as "extreme". In the second pass all extreme fields
+ * are ignored and the column width is counted from non-extreme fields only.
+ */
+static int count_column_width(struct libscols_table *tb,
+			      struct libscols_column *cl,
+			      struct libscols_buffer *buf)
+{
+	int rc = 0, no_header = 0;
+
+	assert(tb);
+	assert(cl);
+
+	cl->width = 0;
+	if (!cl->width_min) {
+		const char *data;
+
+		if (cl->width_hint < 1 && scols_table_is_maxout(tb) && tb->is_term) {
+			cl->width_min = (size_t) (cl->width_hint * tb->termwidth);
+			if (cl->width_min && !is_last_column(cl))
+				cl->width_min--;
+		}
+
+		data = scols_cell_get_data(&cl->header);
+		if (data) {
+			size_t len = scols_table_is_noencoding(tb) ?
+					mbs_width(data) : mbs_safe_width(data);
+			cl->width_min = max(cl->width_min, len);
+		} else
+			no_header = 1;
+
+		if (!cl->width_min)
+			cl->width_min = 1;
+	}
+
+	if (scols_table_is_tree(tb)) {
+		/* Count width for tree */
+		rc = scols_walk_tree(tb, cl, walk_count_cell_width, (void *) buf);
+		if (rc)
+			goto done;
+	} else {
+		/* Count width for list */
+		struct libscols_iter itr;
+		struct libscols_line *ln;
+
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (scols_table_next_line(tb, &itr, &ln) == 0) {
+			rc = count_cell_width(tb, ln, cl, buf);
+			if (rc)
+				goto done;
+		}
+	}
+
+	if (scols_column_is_tree(cl) && has_groups(tb)) {
+		/* We don't fill buffer with groups tree ascii art during width
+		 * calculation. The print function only enlarge grpset[] and we
+		 * calculate final width from grpset_size.
+		 */
+		size_t gprwidth = tb->grpset_size + 1;
+		cl->width_treeart += gprwidth;
+		cl->width_max += gprwidth;
+		cl->width += gprwidth;
+		if (cl->extreme_count)
+			cl->extreme_sum += gprwidth;
+	}
+
+	if (cl->extreme_count && cl->width_avg == 0) {
+		cl->width_avg = cl->extreme_sum / cl->extreme_count;
+		if (cl->width_avg && cl->width_max > cl->width_avg * 2)
+			cl->is_extreme = 1;
+	}
+
+	/* enlarge to minimal width */
+	if (cl->width < cl->width_min && !scols_column_is_strict_width(cl))
+		cl->width = cl->width_min;
+
+	/* use absolute size for large columns */
+	else if (cl->width_hint >= 1 && cl->width < (size_t) cl->width_hint
+		 && cl->width_min < (size_t) cl->width_hint)
+
+		cl->width = (size_t) cl->width_hint;
+
+
+	/* Column without header and data, set minimal size to zero (default is 1) */
+	if (cl->width_max == 0 && no_header && cl->width_min == 1 && cl->width <= 1)
+		cl->width = cl->width_min = 0;
+
+done:
+	ON_DBG(COL, dbg_column(tb, cl));
+	return rc;
+}
+
+/*
+ * This is core of the scols_* voodoo...
+ */
+int __scols_calculate(struct libscols_table *tb, struct libscols_buffer *buf)
+{
+	struct libscols_column *cl;
+	struct libscols_iter itr;
+	size_t width = 0, width_min = 0;	/* output width */
+	int stage, rc = 0;
+	int extremes = 0, group_ncolumns = 0;
+	size_t colsepsz;
+
+
+	DBG(TAB, ul_debugobj(tb, "-----calculate-(termwidth=%zu)-----", tb->termwidth));
+	tb->is_dummy_print = 1;
+
+	colsepsz = scols_table_is_noencoding(tb) ?
+			mbs_width(colsep(tb)) :
+			mbs_safe_width(colsep(tb));
+
+	if (has_groups(tb))
+		group_ncolumns = 1;
+
+	/* set basic columns width
+	 */
+	scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+	while (scols_table_next_column(tb, &itr, &cl) == 0) {
+		int is_last;
+
+		if (scols_column_is_hidden(cl))
+			continue;
+
+		/* we print groups chart only for the for the first tree column */
+		if (scols_column_is_tree(cl) && group_ncolumns == 1) {
+			cl->is_groups = 1;
+			group_ncolumns++;
+		}
+
+		rc = count_column_width(tb, cl, buf);
+		if (rc)
+			goto done;
+
+		is_last = is_last_column(cl);
+
+		width += cl->width + (is_last ? 0 : colsepsz);		/* separator for non-last column */
+		width_min += cl->width_min + (is_last ? 0 : colsepsz);
+		if (cl->is_extreme)
+			extremes++;
+	}
+
+	if (!tb->is_term) {
+		DBG(TAB, ul_debugobj(tb, " non-terminal output"));
+		goto done;
+	}
+
+	/* be paranoid */
+	if (width_min > tb->termwidth && scols_table_is_maxout(tb)) {
+		DBG(TAB, ul_debugobj(tb, " min width larger than terminal! [width=%zu, term=%zu]", width_min, tb->termwidth));
+
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (width_min > tb->termwidth
+		       && scols_table_next_column(tb, &itr, &cl) == 0) {
+			if (scols_column_is_hidden(cl))
+				continue;
+			width_min--;
+			cl->width_min--;
+		}
+		DBG(TAB, ul_debugobj(tb, " min width reduced to %zu", width_min));
+	}
+
+	/* reduce columns with extreme fields */
+	if (width > tb->termwidth && extremes) {
+		DBG(TAB, ul_debugobj(tb, " reduce width (extreme columns)"));
+
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (scols_table_next_column(tb, &itr, &cl) == 0) {
+			size_t org_width;
+
+			if (!cl->is_extreme || scols_column_is_hidden(cl))
+				continue;
+
+			org_width = cl->width;
+			rc = count_column_width(tb, cl, buf);
+			if (rc)
+				goto done;
+
+			if (org_width > cl->width)
+				width -= org_width - cl->width;
+			else
+				extremes--;	/* hmm... nothing reduced */
+		}
+	}
+
+	if (width < tb->termwidth) {
+		if (extremes) {
+			DBG(TAB, ul_debugobj(tb, " enlarge width (extreme columns)"));
+
+			/* enlarge the first extreme column */
+			scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+			while (scols_table_next_column(tb, &itr, &cl) == 0) {
+				size_t add;
+
+				if (!cl->is_extreme || scols_column_is_hidden(cl))
+					continue;
+
+				/* this column is too large, ignore?
+				if (cl->width_max - cl->width >
+						(tb->termwidth - width))
+					continue;
+				*/
+
+				add = tb->termwidth - width;
+				if (add && cl->width + add > cl->width_max)
+					add = cl->width_max - cl->width;
+
+				cl->width += add;
+				width += add;
+
+				if (width == tb->termwidth)
+					break;
+			}
+		}
+
+		if (width < tb->termwidth && scols_table_is_maxout(tb)) {
+			DBG(TAB, ul_debugobj(tb, " enlarge width (max-out)"));
+
+			/* try enlarging all columns */
+			while (width < tb->termwidth) {
+				scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+				while (scols_table_next_column(tb, &itr, &cl) == 0) {
+					if (scols_column_is_hidden(cl))
+						continue;
+					cl->width++;
+					width++;
+					if (width == tb->termwidth)
+						break;
+				}
+			}
+		} else if (width < tb->termwidth) {
+			/* enlarge the last column */
+			struct libscols_column *col = list_entry(
+				tb->tb_columns.prev, struct libscols_column, cl_columns);
+
+			DBG(TAB, ul_debugobj(tb, " enlarge width (last column)"));
+
+			if (!scols_column_is_right(col) && tb->termwidth - width > 0) {
+				col->width += tb->termwidth - width;
+				width = tb->termwidth;
+			}
+		}
+	}
+
+	/* bad, we have to reduce output width, this is done in three stages:
+	 *
+	 * 1) trunc relative with trunc flag if the column width is greater than
+	 *    expected column width (it means "width_hint * terminal_width").
+	 *
+	 * 2) trunc all with trunc flag
+	 *
+	 * 3) trunc relative without trunc flag
+	 *
+	 * Note that SCOLS_FL_WRAP (if no custom wrap function is specified) is
+	 * interpreted as SCOLS_FL_TRUNC.
+	 */
+	for (stage = 1; width > tb->termwidth && stage <= 3; ) {
+		size_t org_width = width;
+
+		DBG(TAB, ul_debugobj(tb, " reduce width - #%d stage (current=%zu, wanted=%zu)",
+				stage, width, tb->termwidth));
+
+		scols_reset_iter(&itr, SCOLS_ITER_FORWARD);
+		while (scols_table_next_column(tb, &itr, &cl) == 0) {
+
+			int trunc_flag = 0;
+
+			DBG(TAB, ul_debugobj(cl, "   checking %s (width=%zu, treeart=%zu)",
+						cl->header.data, cl->width, cl->width_treeart));
+			if (scols_column_is_hidden(cl))
+				continue;
+			if (width <= tb->termwidth)
+				break;
+
+			/* never truncate if already minimal width */
+			if (cl->width == cl->width_min)
+				continue;
+
+			/* never truncate the tree */
+			if (scols_column_is_tree(cl) && width <= cl->width_treeart)
+				continue;
+
+			/* nothing to truncate */
+			if (cl->width == 0)
+				continue;
+
+			trunc_flag = scols_column_is_trunc(cl)
+				    || (scols_column_is_wrap(cl) && !scols_column_is_customwrap(cl));
+
+			switch (stage) {
+			/* #1 stage - trunc relative with TRUNC flag */
+			case 1:
+				if (!trunc_flag)		/* ignore: missing flag */
+					break;
+				if (cl->width_hint <= 0 || cl->width_hint >= 1)	/* ignore: no relative */
+					break;
+				if (cl->width < (size_t) (cl->width_hint * tb->termwidth)) /* ignore: smaller than expected width */
+					break;
+
+				DBG(TAB, ul_debugobj(tb, "     reducing (relative with flag)"));
+				cl->width--;
+				width--;
+				break;
+
+			/* #2 stage - trunc all with TRUNC flag */
+			case 2:
+				if (!trunc_flag)		/* ignore: missing flag */
+					break;
+
+				DBG(TAB, ul_debugobj(tb, "     reducing (all with flag)"));
+				cl->width--;
+				width--;
+				break;
+
+			/* #3 stage - trunc relative without flag */
+			case 3:
+				if (cl->width_hint <= 0 || cl->width_hint >= 1)	/* ignore: no relative */
+					break;
+
+				DBG(TAB, ul_debugobj(tb, "     reducing (relative without flag)"));
+				cl->width--;
+				width--;
+				break;
+			}
+
+			/* hide zero width columns */
+			if (cl->width == 0)
+				cl->flags |= SCOLS_FL_HIDDEN;
+		}
+
+		/* the current stage is without effect, go to the next */
+		if (org_width == width)
+			stage++;
+	}
+
+	/* ignore last column(s) or force last column to be truncated if
+	 * nowrap mode enabled */
+	if (tb->no_wrap && width > tb->termwidth) {
+		scols_reset_iter(&itr, SCOLS_ITER_BACKWARD);
+		while (scols_table_next_column(tb, &itr, &cl) == 0) {
+
+			if (scols_column_is_hidden(cl))
+				continue;
+			if (width <= tb->termwidth)
+				break;
+			if (width - cl->width < tb->termwidth) {
+				size_t r =  width - tb->termwidth;
+
+				cl->flags |= SCOLS_FL_TRUNC;
+				cl->width -= r;
+				width -= r;
+			} else {
+				cl->flags |= SCOLS_FL_HIDDEN;
+				width -= cl->width + colsepsz;
+			}
+		}
+	}
+done:
+	tb->is_dummy_print = 0;
+	DBG(TAB, ul_debugobj(tb, "-----final width: %zu (rc=%d)-----", width, rc));
+	ON_DBG(TAB, dbg_columns(tb));
+
+	return rc;
+}