Original implementation uses a callback based approach which has some
deficiencies like a convoluted control flow and redundant variables.
Use git_config_get_string instead of git_config to take advantage of
the config hash-table.

Signed-off-by: Tanay Abhra <tanay...@gmail.com>
---

**DOUBT**
This patch builds on top of patch series[1]. The first patch in the 
replace `git_config` series is [2], which passed all the tests.

But this patch falters at this test in t1300-repo-config.sh,

git config alias.checkconfig "-c foo.check=bar config foo.check" &&
                echo bar >expect &&
                git checkconfig >actual &&
                test_cmp expect actual

I hand tested this case and the outputs match. But I don't know why the tests
are failing.

In t1300-repo-config this test also fails,

#               git config alias.split-cmdline-fix 'echo "' &&
#               test_must_fail git split-cmdline-fix &&
#               echo foo > foo &&
#               git add foo &&
#               git commit -m 'initial commit' &&
#               git config branch.master.mergeoptions 'echo "' &&
#               test_must_fail git merge master

Can anybody help me with this one?
Thanks.

[1] http://thread.gmane.org/gmane.comp.version-control.git/251704
[2] http://thread.gmane.org/gmane.comp.version-control.git/251707

Cheers,
Tanay Abhra.

 alias.c | 27 ++++++++++-----------------
 1 file changed, 10 insertions(+), 17 deletions(-)

diff --git a/alias.c b/alias.c
index 5efc3d6..fffad73 100644
--- a/alias.c
+++ b/alias.c
@@ -1,24 +1,17 @@
 #include "cache.h"
 
-static const char *alias_key;
-static char *alias_val;
-
-static int alias_lookup_cb(const char *k, const char *v, void *cb)
-{
-       if (starts_with(k, "alias.") && !strcmp(k + 6, alias_key)) {
-               if (!v)
-                       return config_error_nonbool(k);
-               alias_val = xstrdup(v);
-               return 0;
-       }
-       return 0;
-}
-
 char *alias_lookup(const char *alias)
 {
-       alias_key = alias;
-       alias_val = NULL;
-       git_config(alias_lookup_cb, NULL);
+       char *alias_key, *alias_val;
+       const char *v;
+       alias_key = xmalloc(7+strlen(alias));
+       strcpy(alias_key, "alias.");
+       strcat(alias_key, alias);
+       v = git_config_get_string(alias_key);
+       if (!v)
+               config_error_nonbool(alias_key);
+       alias_val = xstrdup(v);
+       free(alias_key);
        return alias_val;
 }
 
-- 
1.9.0.GIT

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