[PATCH v4] builtin/reflog.c: use parse-options api for expire, delete subcommands

["John Cai via GitGitGadget" <gitgitgadget@gmail.com>]

From: John Cai <johncai86@gmail.com>

Switching out manual arg parsing for the parse-options API for the
expire and delete subcommands.

Move explicit_expiry flag into cmd_reflog_expire_cb struct so callbacks
can set both the value of the timestamp as well as the explicit_expiry
flag.

Signed-off-by: "John Cai" <johncai86@gmail.com>
---
    reflog.c: switch to use parse-options API
    
    Switch out manual argv parsing for the reflog expire subcommand to use
    the parse-options API. This reduces code redundancy by consolidating
    option parsing logic.
    
    NOTE: this patch was based off of next. I know now that I should base it
    off of master. But practically, nothing in master touched reflog.c
    except for ab/reflog-prep
    
    changes since v3:
    
     * fixed indentation
    
    changes since v2:
    
     * got rid of parse_opt_expiry_date helper based on feedback from Junio.
       Just call parse_expiry_date directly in the callbacks, and don't
       worry about unset, as we can just set the PARSE_OPT_NONEG flag for
       --expire and --expire-unreachable since the original code didn't
       support a negated version of those flags anyway. The documentation
       also explicitly states to use "never" as the argument.
     * fix places where we set int i inside a for loop construct.

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1175%2Fjohn-cai%2Fjc%2Freflog-switch-to-option-parse-v4
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1175/john-cai/jc/reflog-switch-to-option-parse-v4
Pull-Request: https://github.com/git/git/pull/1175

Range-diff vs v3:

 1:  99a97e6ee52 ! 1:  0efdf3d2cb1 builtin/reflog.c: use parse-options api for expire, delete subcommands
     @@ builtin/reflog.c: static void set_reflog_expiry_param(struct cmd_reflog_expire_c
       
      +static const char * reflog_expire_usage[] = {
      +	N_("git reflog expire [--expire=<time>] "
     -+   "[--expire-unreachable=<time>] "
     -+   "[--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] "
     -+   "[--verbose] [--all] <refs>..."),
     ++	   "[--expire-unreachable=<time>] "
     ++	   "[--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] "
     ++	   "[--verbose] [--all] <refs>..."),
      +	NULL
      +};
      +


 builtin/reflog.c | 174 ++++++++++++++++++++++++++---------------------
 1 file changed, 95 insertions(+), 79 deletions(-)

diff --git a/builtin/reflog.c b/builtin/reflog.c
index a4b1dd27e13..1b3b298eec4 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -12,15 +12,6 @@
 #include "reachable.h"
 #include "worktree.h"
 
-/* NEEDSWORK: switch to using parse_options */
-static const char reflog_expire_usage[] =
-N_("git reflog expire [--expire=<time>] "
-   "[--expire-unreachable=<time>] "
-   "[--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] "
-   "[--verbose] [--all] <refs>...");
-static const char reflog_delete_usage[] =
-N_("git reflog delete [--rewrite] [--updateref] "
-   "[--dry-run | -n] [--verbose] <refs>...");
 static const char reflog_exists_usage[] =
 N_("git reflog exists <ref>");
 
@@ -29,6 +20,7 @@ static timestamp_t default_reflog_expire_unreachable;
 
 struct cmd_reflog_expire_cb {
 	int stalefix;
+	int explicit_expiry;
 	timestamp_t expire_total;
 	timestamp_t expire_unreachable;
 	int recno;
@@ -520,18 +512,18 @@ static int reflog_expire_config(const char *var, const char *value, void *cb)
 	return 0;
 }
 
-static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
+static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, const char *ref)
 {
 	struct reflog_expire_cfg *ent;
 
-	if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
+	if (cb->explicit_expiry == (EXPIRE_TOTAL|EXPIRE_UNREACH))
 		return; /* both given explicitly -- nothing to tweak */
 
 	for (ent = reflog_expire_cfg; ent; ent = ent->next) {
 		if (!wildmatch(ent->pattern, ref, 0)) {
-			if (!(slot & EXPIRE_TOTAL))
+			if (!(cb->explicit_expiry & EXPIRE_TOTAL))
 				cb->expire_total = ent->expire_total;
-			if (!(slot & EXPIRE_UNREACH))
+			if (!(cb->explicit_expiry & EXPIRE_UNREACH))
 				cb->expire_unreachable = ent->expire_unreachable;
 			return;
 		}
@@ -541,29 +533,87 @@ static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, c
 	 * If unconfigured, make stash never expire
 	 */
 	if (!strcmp(ref, "refs/stash")) {
-		if (!(slot & EXPIRE_TOTAL))
+		if (!(cb->explicit_expiry & EXPIRE_TOTAL))
 			cb->expire_total = 0;
-		if (!(slot & EXPIRE_UNREACH))
+		if (!(cb->explicit_expiry & EXPIRE_UNREACH))
 			cb->expire_unreachable = 0;
 		return;
 	}
 
 	/* Nothing matched -- use the default value */
-	if (!(slot & EXPIRE_TOTAL))
+	if (!(cb->explicit_expiry & EXPIRE_TOTAL))
 		cb->expire_total = default_reflog_expire;
-	if (!(slot & EXPIRE_UNREACH))
+	if (!(cb->explicit_expiry & EXPIRE_UNREACH))
 		cb->expire_unreachable = default_reflog_expire_unreachable;
 }
 
+static const char * reflog_expire_usage[] = {
+	N_("git reflog expire [--expire=<time>] "
+	   "[--expire-unreachable=<time>] "
+	   "[--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] "
+	   "[--verbose] [--all] <refs>..."),
+	NULL
+};
+
+static int expire_unreachable_callback(const struct option *opt,
+				 const char *arg,
+				 int unset)
+{
+	struct cmd_reflog_expire_cb *cmd = opt->value;
+
+	if (parse_expiry_date(arg, &cmd->expire_unreachable))
+			die(_("malformed expiration date '%s'"), arg);
+
+	cmd->explicit_expiry |= EXPIRE_UNREACH;
+	return 0;
+}
+
+static int expire_total_callback(const struct option *opt,
+				 const char *arg,
+				 int unset)
+{
+	struct cmd_reflog_expire_cb *cmd = opt->value;
+
+	if (parse_expiry_date(arg, &cmd->expire_total))
+			die(_("malformed expiration date '%s'"), arg);
+
+	cmd->explicit_expiry |= EXPIRE_TOTAL;
+	return 0;
+}
+
 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 {
 	struct cmd_reflog_expire_cb cmd = { 0 };
 	timestamp_t now = time(NULL);
 	int i, status, do_all, all_worktrees = 1;
-	int explicit_expiry = 0;
 	unsigned int flags = 0;
 	int verbose = 0;
 	reflog_expiry_should_prune_fn *should_prune_fn = should_expire_reflog_ent;
+	const struct option options[] = {
+		OPT_BIT(0, "dry-run", &flags, N_("do not actually prune any entries"),
+			EXPIRE_REFLOGS_DRY_RUN),
+		OPT_BIT(0, "rewrite", &flags,
+			N_("rewrite the old SHA1 with the new SHA1 of the entry that now precedes it"),
+			EXPIRE_REFLOGS_REWRITE),
+		OPT_BIT(0, "updateref", &flags,
+			N_("update the reference to the value of the top reflog entry"),
+			EXPIRE_REFLOGS_UPDATE_REF),
+		OPT_BOOL(0, "verbose", &verbose, N_("print extra information on screen.")),
+		OPT_CALLBACK_F(0, "expire", &cmd, N_("timestamp"),
+			N_("prune entries older than the specified time"),
+			PARSE_OPT_NONEG,
+			expire_total_callback),
+		OPT_CALLBACK_F(0, "expire-unreachable", &cmd, N_("timestamp"),
+			N_("prune entries older than <time> that are not reachable from the current tip of the branch"),
+			PARSE_OPT_NONEG,
+			expire_unreachable_callback),
+		OPT_BOOL(0, "stale-fix", &cmd.stalefix,
+			N_("prune any reflog entries that point to broken commits")),
+		OPT_BOOL(0, "all", &do_all, N_("process the reflogs of all references")),
+		OPT_BOOL(1, "single-worktree", &all_worktrees,
+			N_("limits processing to reflogs from the current worktree only.")),
+		OPT_END()
+	};
 
 	default_reflog_expire_unreachable = now - 30 * 24 * 3600;
 	default_reflog_expire = now - 90 * 24 * 3600;
@@ -572,45 +622,11 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 	save_commit_buffer = 0;
 	do_all = status = 0;
 
+	cmd.explicit_expiry = 0;
 	cmd.expire_total = default_reflog_expire;
 	cmd.expire_unreachable = default_reflog_expire_unreachable;
 
-	for (i = 1; i < argc; i++) {
-		const char *arg = argv[i];
-
-		if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
-			flags |= EXPIRE_REFLOGS_DRY_RUN;
-		else if (skip_prefix(arg, "--expire=", &arg)) {
-			if (parse_expiry_date(arg, &cmd.expire_total))
-				die(_("'%s' is not a valid timestamp"), arg);
-			explicit_expiry |= EXPIRE_TOTAL;
-		}
-		else if (skip_prefix(arg, "--expire-unreachable=", &arg)) {
-			if (parse_expiry_date(arg, &cmd.expire_unreachable))
-				die(_("'%s' is not a valid timestamp"), arg);
-			explicit_expiry |= EXPIRE_UNREACH;
-		}
-		else if (!strcmp(arg, "--stale-fix"))
-			cmd.stalefix = 1;
-		else if (!strcmp(arg, "--rewrite"))
-			flags |= EXPIRE_REFLOGS_REWRITE;
-		else if (!strcmp(arg, "--updateref"))
-			flags |= EXPIRE_REFLOGS_UPDATE_REF;
-		else if (!strcmp(arg, "--all"))
-			do_all = 1;
-		else if (!strcmp(arg, "--single-worktree"))
-			all_worktrees = 0;
-		else if (!strcmp(arg, "--verbose"))
-			verbose = 1;
-		else if (!strcmp(arg, "--")) {
-			i++;
-			break;
-		}
-		else if (arg[0] == '-')
-			usage(_(reflog_expire_usage));
-		else
-			break;
-	}
+	argc = parse_options(argc, argv, prefix, options, reflog_expire_usage, 0);
 
 	if (verbose)
 		should_prune_fn = should_expire_reflog_ent_verbose;
@@ -657,7 +673,7 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 				.dry_run = !!(flags & EXPIRE_REFLOGS_DRY_RUN),
 			};
 
-			set_reflog_expiry_param(&cb.cmd, explicit_expiry, item->string);
+			set_reflog_expiry_param(&cb.cmd,  item->string);
 			status |= reflog_expire(item->string, flags,
 						reflog_expiry_prepare,
 						should_prune_fn,
@@ -667,7 +683,7 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 		string_list_clear(&collected.reflogs, 0);
 	}
 
-	for (; i < argc; i++) {
+	for (i = 0; i < argc; i++) {
 		char *ref;
 		struct expire_reflog_policy_cb cb = { .cmd = cmd };
 
@@ -675,7 +691,7 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 			status |= error(_("%s points nowhere!"), argv[i]);
 			continue;
 		}
-		set_reflog_expiry_param(&cb.cmd, explicit_expiry, ref);
+		set_reflog_expiry_param(&cb.cmd, ref);
 		status |= reflog_expire(ref, flags,
 					reflog_expiry_prepare,
 					should_prune_fn,
@@ -696,6 +712,12 @@ static int count_reflog_ent(struct object_id *ooid, struct object_id *noid,
 	return 0;
 }
 
+static const char * reflog_delete_usage[] = {
+	N_("git reflog delete [--rewrite] [--updateref] "
+   "[--dry-run | -n] [--verbose] <refs>..."),
+	NULL
+};
+
 static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 {
 	struct cmd_reflog_expire_cb cmd = { 0 };
@@ -703,34 +725,28 @@ static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
 	unsigned int flags = 0;
 	int verbose = 0;
 	reflog_expiry_should_prune_fn *should_prune_fn = should_expire_reflog_ent;
-
-	for (i = 1; i < argc; i++) {
-		const char *arg = argv[i];
-		if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
-			flags |= EXPIRE_REFLOGS_DRY_RUN;
-		else if (!strcmp(arg, "--rewrite"))
-			flags |= EXPIRE_REFLOGS_REWRITE;
-		else if (!strcmp(arg, "--updateref"))
-			flags |= EXPIRE_REFLOGS_UPDATE_REF;
-		else if (!strcmp(arg, "--verbose"))
-			verbose = 1;
-		else if (!strcmp(arg, "--")) {
-			i++;
-			break;
-		}
-		else if (arg[0] == '-')
-			usage(_(reflog_delete_usage));
-		else
-			break;
-	}
+	const struct option options[] = {
+		OPT_BIT(0, "dry-run", &flags, N_("do not actually prune any entries"),
+				EXPIRE_REFLOGS_DRY_RUN),
+		OPT_BIT(0, "rewrite", &flags,
+				N_("rewrite the old SHA1 with the new SHA1 of the entry that now precedes it"),
+				EXPIRE_REFLOGS_REWRITE),
+		OPT_BIT(0, "updateref", &flags,
+				N_("update the reference to the value of the top reflog entry"),
+				EXPIRE_REFLOGS_UPDATE_REF),
+		OPT_BOOL(0, "verbose", &verbose, N_("print extra information on screen.")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, reflog_delete_usage, 0);
 
 	if (verbose)
 		should_prune_fn = should_expire_reflog_ent_verbose;
 
-	if (argc - i < 1)
+	if (argc < 1)
 		return error(_("no reflog specified to delete"));
 
-	for ( ; i < argc; i++) {
+	for (i = 0; i < argc; i++) {
 		const char *spec = strstr(argv[i], "@{");
 		char *ep, *ref;
 		int recno;

base-commit: 194610f4cf2df839ebfd040c5da187c8c0162620
-- 
gitgitgadget