i18n: advice: internationalize message for conflicts

Mark message for translation telling the user she has conflicts to
resolve. Expose each particular use case, in order to enable translating
entire sentences which would facilitate translating into other
languages.

Change "Pull" to lowercase to match other instances. Update test
t5520-pull.sh, that relied on the old error message, to use the new one.

Although we loose in source code conciseness, we would gain better
translations because translators can 1) translate the entire sentence,
including those terms concerning Git (committing, merging, etc) 2) have
leeway to adapt to their languages.

Signed-off-by: Vasco Almeida <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: vascool

advice.c

@@ -79,7 +79,20 @@ int git_default_advice_config(const char *var, const char *value)
 
 int error_resolve_conflict(const char *me)
 {
-	error("%s is not possible because you have unmerged files.", me);
+	if (!strcmp(me, "cherry-pick"))
+		error(_("Cherry-picking is not possible because you have unmerged files."));
+	else if (!strcmp(me, "commit"))
+		error(_("Committing is not possible because you have unmerged files."));
+	else if (!strcmp(me, "merge"))
+		error(_("Merging is not possible because you have unmerged files."));
+	else if (!strcmp(me, "pull"))
+		error(_("Pulling is not possible because you have unmerged files."));
+	else if (!strcmp(me, "revert"))
+		error(_("Reverting is not possible because you have unmerged files."));
+	else
+		error(_("It is not possible to %s because you have unmerged files."),
+			me);
+
 	if (advice_resolve_conflict)
 		/*
 		 * Message used both when 'git commit' fails and when
@@ -93,7 +106,7 @@ int error_resolve_conflict(const char *me)
 void NORETURN die_resolve_conflict(const char *me)
 {
 	error_resolve_conflict(me);
-	die("Exiting because of an unresolved conflict.");
+	die(_("Exiting because of an unresolved conflict."));
 }
 
 void NORETURN die_conclude_merge(void)

builtin/pull.c

@@ -852,7 +852,7 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 	git_config(git_pull_config, NULL);
 
 	if (read_cache_unmerged())
-		die_resolve_conflict("Pull");
+		die_resolve_conflict("pull");
 
 	if (file_exists(git_path("MERGE_HEAD")))
 		die_conclude_merge();

t/t5520-pull.sh

@@ -211,7 +211,7 @@ test_expect_success 'fail if the index has unresolved entries' '
 	test -n "$(git ls-files -u)" &&
 	cp file expected &&
 	test_must_fail git pull . second 2>err &&
-	test_i18ngrep "Pull is not possible because you have unmerged files" err &&
+	test_i18ngrep "Pulling is not possible because you have unmerged files." err &&
 	test_cmp expected file &&
 	git add file &&
 	test -z "$(git ls-files -u)" &&