Store file name and line number for each key-value pair in the cache.
Use the information to print line number and file name in errors raised
by `git_config()` which now uses the configuration files caching layer
internally.

Signed-off-by: Tanay Abhra <tanay...@gmail.com>
---
 config.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/config.c b/config.c
index a7fb9a4..43a951f 100644
--- a/config.c
+++ b/config.c
@@ -1237,9 +1237,15 @@ static int git_config_raw(config_fn_t fn, void *data)
        return git_config_with_options(fn, data, NULL, 1);
 }
 
+struct key_value_info {
+       const char *filename;
+       int linenr;
+};
+
 static int configset_iter(struct config_set *cs, config_fn_t fn, void *data)
 {
        int i;
+       struct key_value_info *kv_info;
        struct string_list *strptr;
        struct config_set_element *entry;
        struct hashmap_iter iter;
@@ -1247,8 +1253,15 @@ static int configset_iter(struct config_set *cs, 
config_fn_t fn, void *data)
        while ((entry = hashmap_iter_next(&iter))) {
                strptr = &entry->value_list;
                for (i = 0; i < strptr->nr; i++) {
-                       if (fn(entry->key, strptr->items[i].string, data) < 0)
-                               die("bad config file line in (TODO: file/line 
info)");
+                       if (fn(entry->key, strptr->items[i].string, data) < 0) {
+                               kv_info = strptr->items[i].util;
+                               if (!kv_info->linenr)
+                                       die("unable to parse command-line 
config");
+                               else
+                                       die("bad config file line %d in %s",
+                                               kv_info->linenr,
+                                               kv_info->filename);
+                       }
                }
        }
        return 0;
@@ -1287,6 +1300,8 @@ static struct config_set_element 
*configset_find_element(struct config_set *cs,
 static int configset_add_value(struct config_set *cs, const char *key, const 
char *value)
 {
        struct config_set_element *e;
+       struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
+       struct string_list_item *si;
        e = configset_find_element(cs, key);
        /*
         * Since the keys are being fed by git_config*() callback mechanism, 
they
@@ -1299,7 +1314,16 @@ static int configset_add_value(struct config_set *cs, 
const char *key, const cha
                string_list_init(&e->value_list, 1);
                hashmap_add(&cs->config_hash, e);
        }
-       string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
+       si = string_list_append_nodup(&e->value_list, value ? xstrdup(value) : 
NULL);
+       if (cf) {
+               kv_info->filename = strintern(cf->name);
+               kv_info->linenr = cf->linenr;
+       } else {
+               /* for values read from `git_config_from_parameters()` */
+               kv_info->filename = strintern("parameter");
+               kv_info->linenr = 0;
+       }
+       si->util = kv_info;
 
        return 0;
 }
@@ -1326,7 +1350,7 @@ void git_configset_clear(struct config_set *cs)
        hashmap_iter_init(&cs->config_hash, &iter);
        while ((entry = hashmap_iter_next(&iter))) {
                free(entry->key);
-               string_list_clear(&entry->value_list, 0);
+               string_list_clear(&entry->value_list, 1);
        }
        hashmap_free(&cs->config_hash, 1);
        cs->hash_initialized = 0;
-- 
1.9.0.GIT

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