[PATCH 2/4] config: factor out config file stack management

[Jeff King <peff@peff.net>]

Because a config callback may start parsing a new file, the
global context regarding the current config file is stored
as a stack. Currently we only need to manage that stack from
git_config_from_file. Let's factor it out to allow new
sources of config data.

Signed-off-by: Jeff King <peff@peff.net>
---
 config.c |   30 +++++++++++++++++++-----------
 1 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/config.c b/config.c
index a6966c1..b82f749 100644
--- a/config.c
+++ b/config.c
@@ -826,6 +826,23 @@ int git_default_config(const char *var, const char *value, void *dummy)
 	return 0;
 }
 
+static void config_file_push(config_file *top, const char *name)
+{
+	top->prev = cf;
+	top->f = NULL;
+	top->name = name;
+	top->linenr = 1;
+	top->eof = 0;
+	strbuf_init(&top->value, 1024);
+	cf = top;
+}
+
+static void config_file_pop(config_file *top)
+{
+	strbuf_release(&top->value);
+	cf = top->prev;
+}
+
 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 {
 	int ret;
@@ -835,21 +852,12 @@ int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 	if (f) {
 		config_file top;
 
-		/* push config-file parsing state stack */
-		top.prev = cf;
+		config_file_push(&top, filename);
 		top.f = f;
-		top.name = filename;
-		top.linenr = 1;
-		top.eof = 0;
-		strbuf_init(&top.value, 1024);
-		cf = &top;
 
 		ret = git_parse_file(fn, data);
 
-		/* pop config-file parsing state stack */
-		strbuf_release(&top.value);
-		cf = top.prev;
-
+		config_file_pop(&top);
 		fclose(f);
 	}
 	return ret;
-- 
1.7.9.rc2.293.gaae2