[PATCH 6/7] config: provide access to the current line number

[Bert Wesarg <bert.wesarg@googlemail.com>]

Users are nowadays trained to see message from CLI tools in the form

    <file>:<lno>: …

To be able to give such messages when notifying the user about
configurations in any config file, it is currently only possible to get
the file name (if the value originates from a file to begin with) via
`current_config_name()`. Now it is also possible to query the current line
number for the configuration.

Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
---
 config.c               |  8 ++++++++
 config.h               |  1 +
 t/helper/test-config.c |  1 +
 t/t1308-config-set.sh  | 14 ++++++++++++--
 4 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/config.c b/config.c
index 4c461bb7a3..5d1d6b5871 100644
--- a/config.c
+++ b/config.c
@@ -3333,6 +3333,14 @@ const char *config_scope_name(enum config_scope scope)
 	}
 }
 
+int current_config_line(void)
+{
+	if (current_config_kvi)
+		return current_config_kvi->linenr;
+	else
+		return cf->linenr;
+}
+
 int lookup_config(const char **mapping, int nr_mapping, const char *var)
 {
 	int i;
diff --git a/config.h b/config.h
index c063f33ff6..371f7f2dd0 100644
--- a/config.h
+++ b/config.h
@@ -306,6 +306,7 @@ const char *config_scope_name(enum config_scope scope);
 enum config_scope current_config_scope(void);
 const char *current_config_origin_type(void);
 const char *current_config_name(void);
+int current_config_line(void);
 
 /**
  * Include Directives
diff --git a/t/helper/test-config.c b/t/helper/test-config.c
index 1e3bc7c8f4..234c722b48 100644
--- a/t/helper/test-config.c
+++ b/t/helper/test-config.c
@@ -48,6 +48,7 @@ static int iterate_cb(const char *var, const char *value, void *data)
 	printf("value=%s\n", value ? value : "(null)");
 	printf("origin=%s\n", current_config_origin_type());
 	printf("name=%s\n", current_config_name());
+	printf("lno=%d\n", current_config_line());
 	printf("scope=%s\n", config_scope_name(current_config_scope()));
 
 	return 0;
diff --git a/t/t1308-config-set.sh b/t/t1308-config-set.sh
index 7b4e1a63eb..9e36e7a590 100755
--- a/t/t1308-config-set.sh
+++ b/t/t1308-config-set.sh
@@ -238,8 +238,8 @@ test_expect_success 'error on modifying repo config without repo' '
 
 cmdline_config="'foo.bar=from-cmdline'"
 test_expect_success 'iteration shows correct origins' '
-	echo "[foo]bar = from-repo" >.git/config &&
-	echo "[foo]bar = from-home" >.gitconfig &&
+	printf "[ignore]\n\tthis = please\n[foo]bar = from-repo\n" >.git/config &&
+	printf "[foo]\n\tbar = from-home\n" >.gitconfig &&
 	if test_have_prereq MINGW
 	then
 		# Use Windows path (i.e. *not* $HOME)
@@ -253,18 +253,28 @@ test_expect_success 'iteration shows correct origins' '
 	value=from-home
 	origin=file
 	name=$HOME_GITCONFIG
+	lno=2
 	scope=global
 
+	key=ignore.this
+	value=please
+	origin=file
+	name=.git/config
+	lno=2
+	scope=repo
+
 	key=foo.bar
 	value=from-repo
 	origin=file
 	name=.git/config
+	lno=3
 	scope=repo
 
 	key=foo.bar
 	value=from-cmdline
 	origin=command line
 	name=
+	lno=-1
 	scope=cmdline
 	EOF
 	GIT_CONFIG_PARAMETERS=$cmdline_config test-tool config iterate >actual &&
-- 
2.24.1.497.g9abd7b20b4.dirty