[PATCH 3/3] - Convert git-checkout-cache to argp

["Sean" <seanlkml@sympatico.ca>]

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Use argp to process command line arguments for git-checkout-cache.  Also,
fix things up so that the order of options on the command line no longer
matters.  To this end, the "-f" (--force) switch only applies to the
individual files given on the command line.   A new forcing version of the
"-a" (--all) switch is added as "-A" (--forceall).

Signed-off-by: Sean Estabrooks <seanlkml@sympatico.ca>


 Documentation/git-checkout-cache.txt |   17 +++--
 checkout-cache.c                     |  113
+++++++++++++++++------------------
 2 files changed, 68 insertions(+), 62 deletions(-)



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Index: checkout-cache.c
===================================================================
--- 4708925e3e3b955ffcb417fc4acdbb0aafdf8dc0/checkout-cache.c  (mode:100644)
+++ uncommitted/checkout-cache.c  (mode:100644)
@@ -3,8 +3,6 @@
  *
  * Copyright (C) 2005 Linus Torvalds
  *
- * Careful: order of argument flags does matter. For example,
- *
  *	git-checkout-cache -a -f file.c
  *
  * Will first check out all files listed in the cache (but not
@@ -14,7 +12,7 @@
  *
  * Also, just doing "git-checkout-cache" does nothing. You probably
  * meant "git-checkout-cache -a". And if you want to force it, you
- * want "git-checkout-cache -f -a".
+ * want "git-checkout-cache -A".
  *
  * Intuitiveness is not the goal here. Repeatability is. The
  * reason for the "no arguments means no work" thing is that
@@ -25,7 +23,7 @@
  * which will force all existing *.h files to be replaced with
  * their cached copies. If an empty command line implied "all",
  * then this would force-refresh everything in the cache, which
- * was not the point.
+ * was not the point.  However, please note the -r option of xargs.
  *
  * Oh, and the "--" is just a good idea when you know the rest
  * will be filenames. Just so that you wouldn't have a filename
@@ -35,8 +33,12 @@
 #include <sys/types.h>
 #include <dirent.h>
 #include "cache.h"
+#include <argp.h>
+const char *argp_program_version = VERSION;
 
 static int force = 0, quiet = 0, not_new = 0, refresh_cache = 0;
+static int force_opt = 0, force_all = 0, all = 0;
+static const char *base_opt = "";
 
 static void create_directories(const char *path)
 {
@@ -226,68 +228,67 @@
 	return 0;
 }
 
+static const char doc[] = "Populate working tree with files from cache";
+
+static struct argp_option options[] = {
+ {"prefix", 1, "base", 0, "Prepend base to each file before checkout"},
+ {"all", 'a', 0, 0, "Checkout entire cache, will NOT overwrite"},
+ {"forceall", 'A', 0, 0, "Checkout entire cache, with overwrite"},
+ {"force", 'f', 0, 0, "Checkout files listed on command line, with overwrite"},
+ {"quiet", 'q', 0, 0, "Suppress warnings"},
+ {"not-new", 'n', 0, 0, "Checkout existing files only"},
+ {"update", 'u', 0, 0, "Update cache with new stat info"},
+ { }
+};
+
+static error_t parse_opt (int key, char *arg, struct argp_state *state)
+{
+        switch (key) {
+        case 'a':		all = 1; break;
+        case 'q':		quiet = 1; break;
+        case 'n':		not_new = 1; break;
+        case 'f':		force_opt = 1; break;
+        case   1:		base_opt = arg; break;
+        case 'u':		refresh_cache = 1; break;
+        case 'A':		force_all = 1; all = 1; break;
+        default:		return ARGP_ERR_UNKNOWN;
+        }
+        return 0;
+}
+
+static const struct argp argp = { options, parse_opt, "[FILES...]", doc };
+
 int main(int argc, char **argv)
 {
-	int i, force_filename = 0;
-	const char *base_dir = "";
 	struct cache_file cache_file;
-	int newfd = -1;
+	int i, idx, newfd = -1;
 
 	if (read_cache() < 0) {
 		die("invalid cache");
 	}
 
-	for (i = 1; i < argc; i++) {
-		const char *arg = argv[i];
-		if (!force_filename) {
-			if (!strcmp(arg, "-a")) {
-				checkout_all(base_dir);
-				continue;
-			}
-			if (!strcmp(arg, "--")) {
-				force_filename = 1;
-				continue;
-			}
-			if (!strcmp(arg, "-f")) {
-				force = 1;
-				continue;
-			}
-			if (!strcmp(arg, "-q")) {
-				quiet = 1;
-				continue;
-			}
-			if (!strcmp(arg, "-n")) {
-				not_new = 1;
-				continue;
-			}
-			if (!strcmp(arg, "-u")) {
-				refresh_cache = 1;
-				if (newfd < 0)
-					newfd = hold_index_file_for_update
-						(&cache_file,
-						 get_index_file());
-				if (newfd < 0)
-					die("cannot open index.lock file.");
-				continue;
-			}
-			if (!memcmp(arg, "--prefix=", 9)) {
-				base_dir = arg+9;
-				continue;
-			}
-		}
-		if (base_dir[0]) {
-			/* when --prefix is specified we do not
-			 * want to update cache.
-			 */
-			if (refresh_cache) {
-				close(newfd); newfd = -1;
-				rollback_index_file(&cache_file);
-			}
-			refresh_cache = 0;
-		}
-		checkout_file(arg, base_dir);
+	error_t rc = argp_parse(&argp, argc, argv, 0, &idx, NULL);
+	if (rc) {
+		fprintf(stderr, "argument failed: %s\n", strerror(rc));
+		return 1;
 	}
 
+	if (refresh_cache) {
+		if (base_opt[0])
+			die("cannot update cache when --prefix option is used");
+		newfd = hold_index_file_for_update(&cache_file, get_index_file());
+		if (newfd < 0)
+			die("cannot open index.lock file.");
+	}
+
+	force = force_all;
+	if (all)
+		checkout_all(base_opt); 
+
+	force = force_opt;
+	for (i = idx; i < argc; i++) 
+		checkout_file(argv[i], base_opt);
+
 	if (0 <= newfd &&
 	    (write_cache(newfd, active_cache, active_nr) ||
 	     commit_index_file(&cache_file)))
Index: Documentation/git-checkout-cache.txt
===================================================================
--- 4708925e3e3b955ffcb417fc4acdbb0aafdf8dc0/Documentation/git-checkout-cache.txt  (mode:100644)
+++ uncommitted/Documentation/git-checkout-cache.txt  (mode:100644)
@@ -9,8 +9,8 @@
 
 SYNOPSIS
 --------
-'git-checkout-cache' [-u] [-q] [-a] [-f] [-n] [--prefix=<string>]
-	           [--] <file>...
+'git-checkout-cache' [-u] [-q] [-a] [-A] [-f] [-n] [--prefix=<string>]
+	           [--] [file]...
 
 DESCRIPTION
 -----------
@@ -24,15 +24,20 @@
 	the cache file.
 
 -q::
-	be quiet if files exist or are not in the cache
+	be quiet if files exist or are not in the cache.
 
 -f::
-	forces overwrite of existing files
+	forces overwrite when checking out files listed on the
+	command line (does not apply to -a option).
 
 -a::
 	checks out all files in the cache (will then continue to
 	process listed files).
 
+-A::
+	checks out all files in the cache, forces overwrite of 
+	existing files.
+
 -n::
 	Don't checkout new files, only refresh files already checked
 	out.
@@ -44,7 +49,7 @@
 --::
 	Do not interpret any more arguments as options.
 
-Note that the order of the flags matters:
+Example:
 
      git-checkout-cache -a -f file.c
 
@@ -54,7 +59,7 @@
 
 Also, just doing "git-checkout-cache" does nothing. You probably meant
 "git-checkout-cache -a". And if you want to force it, you want
-"git-checkout-cache -f -a".
+"git-checkout-cache -A".
 
 Intuitiveness is not the goal here. Repeatability is. The reason for
 the "no arguments means no work" thing is that from scripts you are