[PATCH v4 16/22] config: add git_config_get_expiry() from gc.c

[Christian Couder <christian.couder@gmail.com>]

This function will be used in a following commit to get the expiration
time of the shared index files from the config, and it is generic
enough to be put in "config.c".

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 builtin/gc.c | 15 ++-------------
 cache.h      |  3 +++
 config.c     | 13 +++++++++++++
 3 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/builtin/gc.c b/builtin/gc.c
index 331f219260..66dff6a8af 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -62,17 +62,6 @@ static void report_pack_garbage(unsigned seen_bits, const char *path)
 		string_list_append(&pack_garbage, path);
 }
 
-static void git_config_date_string(const char *key, const char **output)
-{
-	if (git_config_get_string_const(key, output))
-		return;
-	if (strcmp(*output, "now")) {
-		unsigned long now = approxidate("now");
-		if (approxidate(*output) >= now)
-			git_die_config(key, _("Invalid %s: '%s'"), key, *output);
-	}
-}
-
 static void process_log_file(void)
 {
 	struct stat st;
@@ -111,8 +100,8 @@ static void gc_config(void)
 	git_config_get_int("gc.auto", &gc_auto_threshold);
 	git_config_get_int("gc.autopacklimit", &gc_auto_pack_limit);
 	git_config_get_bool("gc.autodetach", &detach_auto);
-	git_config_date_string("gc.pruneexpire", &prune_expire);
-	git_config_date_string("gc.worktreepruneexpire", &prune_worktrees_expire);
+	git_config_get_expiry("gc.pruneexpire", &prune_expire);
+	git_config_get_expiry("gc.worktreepruneexpire", &prune_worktrees_expire);
 	git_config(git_default_config, NULL);
 }
 
diff --git a/cache.h b/cache.h
index 6b25b50aab..8994e7d373 100644
--- a/cache.h
+++ b/cache.h
@@ -1888,6 +1888,9 @@ extern int git_config_get_untracked_cache(void);
 extern int git_config_get_split_index(void);
 extern int git_config_get_max_percent_split_change(void);
 
+/* This dies if the configured or default date is in the future */
+extern int git_config_get_expiry(const char *key, const char **output);
+
 /*
  * This is a hack for test programs like test-dump-untracked-cache to
  * ensure that they do not modify the untracked cache when reading it.
diff --git a/config.c b/config.c
index 35b6f02960..f20d7d88f7 100644
--- a/config.c
+++ b/config.c
@@ -1712,6 +1712,19 @@ int git_config_get_pathname(const char *key, const char **dest)
 	return ret;
 }
 
+int git_config_get_expiry(const char *key, const char **output)
+{
+	int ret = git_config_get_string_const(key, output);
+	if (ret)
+		return ret;
+	if (strcmp(*output, "now")) {
+		unsigned long now = approxidate("now");
+		if (approxidate(*output) >= now)
+			git_die_config(key, _("Invalid %s: '%s'"), key, *output);
+	}
+	return ret;
+}
+
 int git_config_get_untracked_cache(void)
 {
 	int val = -1;
-- 
2.12.0.22.g0672473d40