Expose the `config_set` C API as a set of simple commands in order to
facilitate testing. Add tests for the `config_set` API as well as for
`git_config_get_*()` family for the usual config files.

Signed-off-by: Tanay Abhra <tanay...@gmail.com>
---
 .gitignore             |   1 +
 Makefile               |   1 +
 t/t1308-config-hash.sh | 163 +++++++++++++++++++++++++++++++++++++++++++++++++
 test-config.c          | 129 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 294 insertions(+)
 create mode 100755 t/t1308-config-hash.sh
 create mode 100644 test-config.c

diff --git a/.gitignore b/.gitignore
index 42294e5..eeb66e2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -176,6 +176,7 @@
 /gitweb/static/gitweb.js
 /gitweb/static/gitweb.min.*
 /test-chmtime
+/test-config
 /test-ctype
 /test-date
 /test-delta
diff --git a/Makefile b/Makefile
index d503f78..e875070 100644
--- a/Makefile
+++ b/Makefile
@@ -548,6 +548,7 @@ X =
 PROGRAMS += $(patsubst %.o,git-%$X,$(PROGRAM_OBJS))
 
 TEST_PROGRAMS_NEED_X += test-chmtime
+TEST_PROGRAMS_NEED_X += test-config
 TEST_PROGRAMS_NEED_X += test-ctype
 TEST_PROGRAMS_NEED_X += test-date
 TEST_PROGRAMS_NEED_X += test-delta
diff --git a/t/t1308-config-hash.sh b/t/t1308-config-hash.sh
new file mode 100755
index 0000000..6c059c5
--- /dev/null
+++ b/t/t1308-config-hash.sh
@@ -0,0 +1,163 @@
+#!/bin/sh
+
+test_description='Test git config-hash API in different settings'
+
+. ./test-lib.sh
+
+test_expect_success 'clear default config' '
+       rm -f .git/config
+'
+
+cat > .git/config << EOF
+[core]
+       penguin = very blue
+       Movie = BadPhysics
+       UPPERCASE = true
+       MixedCase = true
+       my =
+       foo
+       baz = sam
+[Cores]
+       WhatEver = Second
+[my "Foo bAr"]
+       hi = hello
+[core]
+       baz = bat
+       baz = hask
+[lamb]
+       chop = 65
+       head = none
+[goat]
+       legs = 4
+       head = true
+       skin = false
+       nose = 1
+       horns
+EOF
+
+test_expect_success 'get value for a simple key' '
+       echo "very blue" >expect &&
+       test-config get_value core.penguin >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'get value for a key with value as an empty string' '
+       echo "" >expect &&
+       test-config get_value core.my >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'get value for a key with value as NULL' '
+       echo "(NULL)" >expect &&
+       test-config get_value core.foo >actual &&
+       test_cmp expect actual
+'
+test_expect_success 'upper case key' '
+       echo "true" >expect &&
+       test-config get_value core.UPPERCASE >actual &&
+       test_cmp expect actual
+'
+test_expect_success 'mixed case key' '
+       echo "true" >expect &&
+       test-config get_value core.MixedCase >actual &&
+       test_cmp expect actual
+'
+test_expect_success 'key and value with mixed case' '
+       echo "BadPhysics" >expect &&
+       test-config get_value core.Movie >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'key with case sensitive subsection' '
+       echo "hello" >expect &&
+       test-config get_value "my.Foo bAr.hi">actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'find value with misspelled key' '
+       echo "Value not found for \"my.fOo Bar.hi\"" >expect &&
+       test_must_fail test-config get_value "my.fOo Bar.hi">actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'find value with the highest priority' '
+       echo hask >expect &&
+       test-config get_value "core.baz">actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'find integer value for a key' '
+       echo 65 >expect &&
+       test-config get_int lamb.chop >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'find integer if value is non parse-able' '
+       echo 65 >expect &&
+       test_must_fail test-config get_int lamb.head >actual &&
+       test_must_fail test_cmp expect actual
+'
+
+cat > expect << EOF
+1
+0
+1
+1
+1
+EOF
+
+test_expect_success 'find bool value for the entered key' '
+       test-config get_bool goat.head >>actual &&
+       test-config get_bool goat.skin >>actual &&
+       test-config get_bool goat.nose >>actual &&
+       test-config get_bool goat.horns >>actual &&
+       test-config get_bool goat.legs >>actual &&
+       test_cmp expect actual
+'
+
+cat > expect << EOF
+sam
+bat
+hask
+EOF
+
+test_expect_success 'find multiple values' '
+       test-config get_value_multi "core.baz">actual &&
+       test_cmp expect actual
+'
+
+cat > config2 << EOF
+[core]
+       baz = lama
+[my]
+       new = silk
+[core]
+       baz = ball
+EOF
+
+test_expect_success 'find value from a configset' '
+       echo silk > expect &&
+       test-config configset_get_value 2 config2 .git/config my.new >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'find value with highest priority from a configset' '
+       echo hask > expect &&
+       test-config configset_get_value 2 config2 .git/config core.baz >actual 
&&
+       test_cmp expect actual
+'
+
+cat > except << EOF
+sam
+bat
+hask
+lama
+ball
+EOF
+
+test_expect_success 'find value_list for a key from a configset' '
+       test-config configset_get_value 2 config2 .git/config core.baz >actual 
&&
+       test_cmp expect actual
+'
+
+test_done
diff --git a/test-config.c b/test-config.c
new file mode 100644
index 0000000..32c912a
--- /dev/null
+++ b/test-config.c
@@ -0,0 +1,129 @@
+#include "cache.h"
+#include "hashmap.h"
+#include "string-list.h"
+
+/*
+ * This program exposes the C API of the `config_set` mechanism
+ * as a set of simple commands in order to facilitate testing.
+ *
+ * Reads stdin and prints result of command to stdout:
+ *
+ * get_value -> prints the value with highest priority for the entered key
+ *
+ * get_value_multi -> prints all values for the entered key in increasing order
+ *                  of priority
+ *
+ * get_int -> print integer value for the entered key or die
+ *
+ * get_bool -> print bool value for the entered key or die
+ *
+ * configset_get_value -> first makes a config-set of files entered as 
arguments
+ *                      and then returns value with the highest priority for 
the
+ *                      entered key.
+ *
+ * configset_get_value_multi -> first makes a config-set of files entered as
+ *                             arguments and then returns value_list for the 
entered
+ *                             key sorted in ascending order of priority.
+ *
+ * Examples:
+ *
+ * To print the value with highest priority for key "foo.bAr Baz.rock":
+ *     test-config get_value "foo.bAr Baz.rock"
+ *
+ */
+
+
+int main(int argc, char **argv)
+{
+       int i, no_of_files;
+       int ret = 0;
+       const char *v;
+       int val;
+       const struct string_list *strptr;
+       struct config_set cs = CONFIG_SET_INIT;
+       if (argc == 3 && !strcmp(argv[1], "get_value")) {
+               if (!git_config_get_value(argv[2], &v)) {
+                       if (!v)
+                               printf("(NULL)\n");
+                       else
+                               printf("%s\n", v);
+                       return 0;
+               } else {
+                       printf("Value not found for \"%s\"\n", argv[2]);
+                       return -1;
+               }
+       } else if (argc == 3 && !strcmp(argv[1], "get_value_multi")) {
+               strptr = git_config_get_value_multi(argv[2]);
+               if (strptr) {
+                       for (i = 0; i < strptr->nr; i++) {
+                               v = strptr->items[i].string;
+                               if (!v)
+                                       printf("(NULL)\n");
+                               else
+                                       printf("%s\n", v);
+                       }
+                       return 0;
+               } else {
+                       printf("Value not found for \"%s\"\n", argv[2]);
+                       return -1;
+               }
+       } else if (argc == 3 && !strcmp(argv[1], "get_int")) {
+               if (!git_config_get_int(argv[2], &val)) {
+                       printf("%d\n", val);
+                       return 0;
+               } else {
+                       printf("Value not found for \"%s\"\n", argv[2]);
+                       return -1;
+               }
+       } else if (argc == 3 && !strcmp(argv[1], "get_bool")) {
+               if (!git_config_get_bool(argv[2], &val)) {
+                       printf("%d\n", val);
+                       return 0;
+               } else {
+                       printf("Value not found for \"%s\"\n", argv[2]);
+                       return -1;
+               }
+       } else if (!strcmp(argv[1], "configset_get_value")) {
+               no_of_files = git_config_int("unused", argv[2]);
+               for (i = 1; i <= no_of_files; i++) {
+                       ret = git_configset_add_file(&cs, argv[i + 2]);
+                       if (ret)
+                               return -1;
+               }
+               if (!git_configset_get_value(&cs, argv[3 + no_of_files], &v)) {
+                       if (!v)
+                               printf("(NULL)\n");
+                       else
+                               printf("%s\n", v);
+                       return 0;
+               } else {
+                       printf("Value not found for \"%s\"\n", argv[2]);
+                       return -1;
+               }
+
+       } else if (!strcmp(argv[1], "configset_get_value_multi")) {
+               no_of_files = git_config_int("unused", argv[2]);
+               for (i = 1; i <= no_of_files; i++) {
+                       ret = git_configset_add_file(&cs, argv[i + 2]);
+                       if (ret)
+                               return -1;
+               }
+               strptr = git_configset_get_value_multi(&cs, argv[3 + 
no_of_files]);
+               if (strptr) {
+                       for (i = 0; i < strptr->nr; i++) {
+                               v = strptr->items[i].string;
+                               if (!v)
+                                       printf("(NULL)\n");
+                               else
+                                       printf("%s\n", v);
+                       }
+                       return 0;
+               } else {
+                       printf("Value not found for \"%s\"\n", argv[2]);
+                       return -1;
+               }
+       }
+
+       fprintf(stderr, "%s: Please check the syntax and the function name\n", 
argv[0]);
+       return 1;
+}
-- 
1.9.0.GIT

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