[PATCH] add short options to show-files

[Nicolas Pitre <nico@cam.org>]

The show-files long options are cumbersome to type.  This patch adds 
equivalent short options.

Also add missing "unmerged" to usage string.

Finally reduce the number of lines for argument parsing in half.

Signed-off-by: Nicolas Pitre <nico@cam.org>

--- k/show-files.c
+++ l/show-files.c
@@ -206,6 +206,10 @@ static void show_files(void)
 	}
 }
 
+static const char *show_files_usage =
+	"show-files [-z] (--[cached|deleted|others|stage|unmerged])* "
+	"[ --ignored [--exclude=<pattern>] [--exclude-from=<file>) ]";
+
 int main(int argc, char **argv)
 {
 	int i;
@@ -215,55 +219,30 @@ int main(int argc, char **argv)
 
 		if (!strcmp(arg, "-z")) {
 			line_terminator = 0;
-			continue;
-		}
-
-		if (!strcmp(arg, "--cached")) {
+		} else if (!strcmp(arg, "-c") || !strcmp(arg, "--cached")) {
 			show_cached = 1;
-			continue;
-		}
-		if (!strcmp(arg, "--deleted")) {
+		} else if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
 			show_deleted = 1;
-			continue;
-		}
-		if (!strcmp(arg, "--others")) {
+		} else if (!strcmp(arg, "-o") || !strcmp(arg, "--others")) {
 			show_others = 1;
-			continue;
-		}
-		if (!strcmp(arg, "--ignored")) {
+		} else if (!strcmp(arg, "-i") || !strcmp(arg, "--ignored")) {
 			show_ignored = 1;
-			continue;
-		}
-		if (!strcmp(arg, "--stage")) {
+		} else if (!strcmp(arg, "-s") || !strcmp(arg, "--stage")) {
 			show_stage = 1;
-			continue;
-		}
-		if (!strcmp(arg, "--unmerged")) {
+		} else if (!strcmp(arg, "-u") || !strcmp(arg, "--unmerged")) {
 			// There's no point in showing unmerged unless you also show the stage information
 			show_stage = 1;
 			show_unmerged = 1;
-			continue;
-		}
-
-		if (!strcmp(arg, "-x") && i+1 < argc) {
+		} else if (!strcmp(arg, "-x") && i+1 < argc) {
 			add_exclude(argv[++i]);
-			continue;
-		}
-		if (!strncmp(arg, "--exclude=", 10)) {
+		} else if (!strncmp(arg, "--exclude=", 10)) {
 			add_exclude(arg+10);
-			continue;
-		}
-		if (!strcmp(arg, "-X") && i+1 < argc) {
+		} else if (!strcmp(arg, "-X") && i+1 < argc) {
 			add_excludes_from_file(argv[++i]);
-			continue;
-		}
-		if (!strncmp(arg, "--exclude-from=", 15)) {
+		} else 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>) ]");
+		} else
+			usage(show_files_usage);
 	}
 
 	if (show_ignored && !nr_excludes) {