From 9ff768e9408b2afac5dbb484eb5c301312bdee80 Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Thu, 28 Apr 2005 11:44:04 -0700
Subject: [PATCH] [PATCH] Give show-files the ability to process exclusion
 pattern.

This can be used with the famous dontdiff file as follows to find out
about uncommitted files just like dontdiff is used with the diff
command:

    show-files --others --exclude-from=dontdiff

and the exclude list can be reversed with the --ignore switch.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 show-files.c | 105 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 97 insertions(+), 8 deletions(-)

diff --git a/show-files.c b/show-files.c
index afeb63567..9bb8fdb00 100644
--- a/show-files.c
+++ b/show-files.c
@@ -6,6 +6,7 @@
  * Copyright (C) Linus Torvalds, 2005
  */
 #include <dirent.h>
+#include <fnmatch.h>
 
 #include "cache.h"
 
@@ -17,6 +18,70 @@ static int show_stage = 0;
 static int show_unmerged = 0;
 static int line_terminator = '\n';
 
+static int nr_excludes;
+static const char **excludes;
+static int excludes_alloc;
+
+static void add_exclude(const char *string)
+{
+	if (nr_excludes == excludes_alloc) {
+		excludes_alloc = alloc_nr(excludes_alloc);
+		excludes = realloc(excludes, excludes_alloc*sizeof(char *));
+	}
+	excludes[nr_excludes++] = string;
+}
+
+static void add_excludes_from_file(const char *fname)
+{
+	int fd, i;
+	long size;
+	char *buf, *entry;
+
+	fd = open(fname, O_RDONLY);
+	if (fd < 0)
+		goto err;
+	size = lseek(fd, 0, SEEK_END);
+	if (size < 0)
+		goto err;
+	lseek(fd, 0, SEEK_SET);
+	if (size == 0) {
+		close(fd);
+		return;
+	}
+	buf = xmalloc(size);
+	if (read(fd, buf, size) != size)
+		goto err;
+	close(fd);
+
+	entry = buf;
+	for (i = 0; i < size; i++) {
+		if (buf[i] == '\n') {
+			if (entry != buf + i) {
+				buf[i] = 0;
+				add_exclude(entry);
+			}
+			entry = buf + i + 1;
+		}
+	}
+	return;
+
+err:	perror(fname);
+	exit(1);
+}
+
+static int excluded(const char *pathname)
+{
+	int i;
+	if (nr_excludes) {
+		const char *basename = strrchr(pathname, '/');
+		basename = (basename) ? basename+1 : pathname;
+		for (i = 0; i < nr_excludes; i++)
+			if (fnmatch(excludes[i], basename, 0) == 0)
+				return 1;
+	}
+	return 0;
+}
+
 static const char **dir;
 static int nr_dir;
 static int dir_alloc;
@@ -59,6 +124,8 @@ static void read_directory(const char *path, const char *base, int baselen)
 
 			if (de->d_name[0] == '.')
 				continue;
+			if (excluded(de->d_name) != show_ignored)
+				continue;
 			len = strlen(de->d_name);
 			memcpy(fullname + baselen, de->d_name, len+1);
 
@@ -101,17 +168,17 @@ static void show_files(void)
 	int i;
 
 	/* For cached/deleted files we don't need to even do the readdir */
-	if (show_others | show_ignored) {
+	if (show_others) {
 		read_directory(".", "", 0);
 		qsort(dir, nr_dir, sizeof(char *), cmp_name);
-	}
-	if (show_others) {
 		for (i = 0; i < nr_dir; i++)
 			printf("%s%c", dir[i], line_terminator);
 	}
 	if (show_cached | show_stage) {
 		for (i = 0; i < active_nr; i++) {
 			struct cache_entry *ce = active_cache[i];
+			if (excluded(ce->name) != show_ignored)
+				continue;
 			if (show_unmerged && !ce_stage(ce))
 				continue;
 			if (!show_stage)
@@ -130,14 +197,13 @@ static void show_files(void)
 		for (i = 0; i < active_nr; i++) {
 			struct cache_entry *ce = active_cache[i];
 			struct stat st;
+			if (excluded(ce->name) != show_ignored)
+				continue;
 			if (!stat(ce->name, &st))
 				continue;
 			printf("%s%c", ce->name, line_terminator);
 		}
 	}
-	if (show_ignored) {
-		/* We don't have any "ignore" list yet */
-	}
 }
 
 int main(int argc, char **argv)
@@ -179,11 +245,34 @@ int main(int argc, char **argv)
 			continue;
 		}
 
-		usage("show-files [-z] (--[cached|deleted|others|ignored|stage])*");
+		if (!strcmp(arg, "-x") && i+1 < argc) {
+			add_exclude(argv[++i]);
+			continue;
+		}
+		if (!strncmp(arg, "--exclude=", 10)) {
+			add_exclude(arg+10);
+			continue;
+		}
+		if (!strcmp(arg, "-X") && i+1 < argc) {
+			add_excludes_from_file(argv[++i]);
+			continue;
+		}
+		if (!strncmp(arg, "--exclude-from=", 15)) {
+			add_excludes_from_file(arg+15);
+			continue;
+		}
+
+		usage("show-files [-z] (--[cached|deleted|others|stage])* "
+		      "[ --ignored [--exclude=<pattern>] [--exclude-from=<file>) ]");
+	}
+
+	if (show_ignored && !nr_excludes) {
+		fprintf(stderr, "%s: --ignored needs some exclude pattern\n", argv[0]);
+		exit(1);
 	}
 
 	/* With no flags, we default to showing the cached files */
-	if (!(show_stage | show_deleted | show_others | show_ignored | show_unmerged))
+	if (!(show_stage | show_deleted | show_others | show_unmerged))
 		show_cached = 1;
 
 	read_cache();
-- 
2.26.2