[PATCH v2 15/17] ls: sort output and remove duplicates

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When you mix different file types, with ls-files you may get separate
listing. For example, "ls-files -cm" will show file "abc" twice: one
as part of cached list, one of modified list. With "ls" (and this
patch) they will be in a single sorted list (easier for the eye).

Duplicate entries are also removed. Note that display content is
compared, so if you have "-t" on, or you color file types differently,
you will get duplicate textual entries. This is good imo.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 builtin/ls-files.c | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index 392d273..709d8b1 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -57,6 +57,13 @@ static const char *tag_modified = "";
 static const char *tag_skip_worktree = "";
 static const char *tag_resolve_undo = "";
 
+static int compare_output(const void *a_, const void *b_)
+{
+	const struct string_list_item *a = a_;
+	const struct string_list_item *b = b_;
+	return strcmp(a->util, b->util);
+}
+
 static void write_name(struct strbuf *sb, const char *name)
 {
 	/*
@@ -72,10 +79,12 @@ static void write_name(struct strbuf *sb, const char *name)
 		quote_path_relative(name, real_prefix, sb);
 }
 
-static void strbuf_fputs(struct strbuf *sb, FILE *fp)
+static void strbuf_fputs(struct strbuf *sb, const char *full_name, FILE *fp)
 {
-	if (column_active(colopts)) {
-		string_list_append(&output, strbuf_detach(sb, NULL));
+	if (column_active(colopts) || porcelain) {
+		struct string_list_item *it;
+		it = string_list_append(&output, strbuf_detach(sb, NULL));
+		it->util = (void*)full_name;
 		return;
 	}
 	fwrite(sb->buf, sb->len, 1, fp);
@@ -110,7 +119,7 @@ static void show_dir_entry(const char *tag, struct dir_entry *ent)
 	strbuf_reset(&sb);
 	strbuf_addstr(&sb, tag);
 	write_dir_entry(&sb, ent);
-	strbuf_fputs(&sb, stdout);
+	strbuf_fputs(&sb, ent->name, stdout);
 }
 
 static void show_other_files(struct dir_struct *dir)
@@ -227,7 +236,7 @@ static void show_ce_entry(const char *tag, const struct cache_entry *ce)
 			    ce_stage(ce));
 	}
 	write_ce_name(&sb, ce);
-	strbuf_fputs(&sb, stdout);
+	strbuf_fputs(&sb, ce->name, stdout);
 	if (debug_mode) {
 		const struct stat_data *sd = &ce->ce_stat_data;
 
@@ -535,7 +544,7 @@ static int ls_files(const char **argv, const char *prefix)
 		if (debug_mode)
 			die(_("--column and --debug are incompatible"));
 	}
-	if (column_active(colopts))
+	if (column_active(colopts) || porcelain)
 		line_terminator = 0;
 
 	if (require_work_tree && !is_inside_work_tree())
@@ -601,10 +610,13 @@ static int ls_files(const char **argv, const char *prefix)
 	if (show_resolve_undo)
 		show_ru_info();
 
-	if (column_active(colopts)) {
-		print_columns(&output, colopts, NULL);
-		string_list_clear(&output, 0);
+	if (porcelain) {
+		qsort(output.items, output.nr, sizeof(*output.items),
+		      compare_output);
+		string_list_remove_duplicates(&output, 0);
 	}
+	print_columns(&output, colopts, NULL);
+	string_list_clear(&output, 0);
 
 	if (ps_matched) {
 		int bad;
-- 
1.9.1.345.ga1a145c

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