[PATCH 03/14] ls-files: add options to support sparse checkout

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The first option to be introduced is --sparse, which puts ls-files
in "sparse mode". In this mode, cached entries are divided into
 - checkout entries: shown by --cached (new behavior with --sparse)
 - no-checkout entries: show by --no-checkout (new option)
 - orphaned entries: shown by --orphaned (new option)

Orphaned entries are themselves no-checkout ones but for some reasons
still be present in working directory.

While at it, fix "--deleted" running out of checkout area.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 Documentation/git-ls-files.txt |   24 +++++++++++++++++++++-
 builtin-ls-files.c             |   41 ++++++++++++++++++++++++++++++++++++---
 2 files changed, 59 insertions(+), 6 deletions(-)

diff --git a/Documentation/git-ls-files.txt b/Documentation/git-ls-files.txt
index 9f85d60..1de68e2 100644
--- a/Documentation/git-ls-files.txt
+++ b/Documentation/git-ls-files.txt
@@ -10,8 +10,9 @@ SYNOPSIS
 --------
 [verse]
 'git ls-files' [-z] [-t] [-v]
-		(--[cached|deleted|others|ignored|stage|unmerged|killed|modified])\*
+		(--[cached|deleted|others|ignored|stage|unmerged|killed|modified|orphaned|no-checkout])\*
 		(-[c|d|o|i|s|u|k|m])\*
+		[--sparse]
 		[-x <pattern>|--exclude=<pattern>]
 		[-X <file>|--exclude-from=<file>]
 		[--exclude-per-directory=<file>]
@@ -32,7 +33,9 @@ OPTIONS
 -------
 -c::
 --cached::
-	Show cached files in the output (default)
+	Show cached files in the output (default). When used with --sparse,
+	show only cached files that are marked "checkout", no-checkout
+	entries will be excluded.
 
 -d::
 --deleted::
@@ -72,6 +75,21 @@ OPTIONS
 	to file/directory conflicts for checkout-index to
 	succeed.
 
+--no-checkout::
+	Show no-checkout entries. This option implies --sparse.
+
+--orphaned::
+	Show orphaned entries. Orphaned entries are no-checkout
+	entries that are present in working directory. This option
+	implies --sparse.
+
+--sparse::
+	When --sparse is passed, cached files will be divided into two
+	parts: checkout entries and no-checkout entries.
+	--cached will only show checkout entries.
+	No-checkout entries can be shown using --orphaned or
+	--no-checkout (or both).
+
 -z::
 	\0 line termination on output.
 
@@ -107,6 +125,8 @@ OPTIONS
 	Identify the file status with the following tags (followed by
 	a space) at the start of each line:
 	H::	cached
+	-::	no-checkout entries
+	O::	orphaned entries
 	M::	unmerged
 	R::	removed/deleted
 	C::	modified/changed
diff --git a/builtin-ls-files.c b/builtin-ls-files.c
index 068f424..873de15 100644
--- a/builtin-ls-files.c
+++ b/builtin-ls-files.c
@@ -20,6 +20,9 @@ static int show_unmerged;
 static int show_modified;
 static int show_killed;
 static int show_valid_bit;
+static int show_orphaned;
+static int show_no_checkout;
+static int sparse_checkout;
 static int line_terminator = '\n';
 
 static int prefix_len;
@@ -35,6 +38,8 @@ static const char *tag_removed = "";
 static const char *tag_other = "";
 static const char *tag_killed = "";
 static const char *tag_modified = "";
+static const char *tag_orphaned = "";
+static const char *tag_no_checkout = "";
 
 
 /*
@@ -235,7 +240,7 @@ static void show_files(struct dir_struct *dir, const char *prefix)
 		if (show_killed)
 			show_killed_files(dir);
 	}
-	if (show_cached | show_stage) {
+	if (show_cached | show_stage | show_orphaned | show_no_checkout) {
 		for (i = 0; i < active_nr; i++) {
 			struct cache_entry *ce = active_cache[i];
 			int dtype = ce_to_dtype(ce);
@@ -245,6 +250,16 @@ static void show_files(struct dir_struct *dir, const char *prefix)
 				continue;
 			if (ce->ce_flags & CE_UPDATE)
 				continue;
+			if (sparse_checkout && ce_no_checkout(ce)) {
+				struct stat st;
+				if (show_no_checkout)
+					show_ce_entry(tag_no_checkout, ce);
+				if (show_orphaned && !lstat(ce->name, &st))
+					show_ce_entry(tag_orphaned, ce);
+				continue;
+			}
+			if (!(show_cached | show_stage))
+				continue;
 			show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
 		}
 	}
@@ -257,7 +272,7 @@ static void show_files(struct dir_struct *dir, const char *prefix)
 			if (excluded(dir, ce->name, &dtype) != dir->show_ignored)
 				continue;
 			err = lstat(ce->name, &st);
-			if (show_deleted && err)
+			if (show_deleted && err && ce_checkout(ce))
 				show_ce_entry(tag_removed, ce);
 			if (show_modified && ce_modified(ce, &st, 0))
 				show_ce_entry(tag_modified, ce);
@@ -423,7 +438,8 @@ int report_path_error(const char *ps_matched, const char **pathspec, int prefix_
 }
 
 static const char ls_files_usage[] =
-	"git ls-files [-z] [-t] [-v] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
+	"git ls-files [-z] [-t] [-v] (--[cached|deleted|others|stage|unmerged|killed|modified|orphaned|no-checkout])* "
+	"[ --sparse ] "
 	"[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
 	"[ --exclude-per-directory=<filename> ] [--exclude-standard] "
 	"[--full-name] [--abbrev] [--] [<file>]*";
@@ -457,6 +473,8 @@ int cmd_ls_files(int argc, const char **argv, const char *prefix)
 			tag_modified = "C ";
 			tag_other = "? ";
 			tag_killed = "K ";
+			tag_orphaned = "O ";
+			tag_no_checkout = "- ";
 			if (arg[1] == 'v')
 				show_valid_bit = 1;
 			continue;
@@ -465,6 +483,21 @@ int cmd_ls_files(int argc, const char **argv, const char *prefix)
 			show_cached = 1;
 			continue;
 		}
+		if (!strcmp(arg, "--sparse")) {
+			sparse_checkout = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--orphaned")) {
+			show_orphaned = 1;
+			sparse_checkout = 1;
+			require_work_tree = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--no-checkout")) {
+			show_no_checkout = 1;
+			sparse_checkout = 1;
+			continue;
+		}
 		if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
 			show_deleted = 1;
 			continue;
@@ -593,7 +626,7 @@ int cmd_ls_files(int argc, const char **argv, const char *prefix)
 
 	/* With no flags, we default to showing the cached files */
 	if (!(show_stage | show_deleted | show_others | show_unmerged |
-	      show_killed | show_modified))
+	      show_killed | show_modified | show_orphaned | show_no_checkout))
 		show_cached = 1;
 
 	read_cache();
-- 
1.6.0.96.g2fad1.dirty

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