i18n: unpack-trees: avoid substituting only a verb in sentences

Instead of reusing the same set of message templates for checkout
and other actions and substituting the verb with "%s", prepare
separate message templates for each known action. That would make
it easier for translation into languages where the same verb may
conjugate differently depending on the message we are giving.

See gettext documentation for details:
http://www.gnu.org/software/gettext/manual/html_node/Preparing-Strings.html

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Vasco Almeida <vascomalmeida@sapo.pt>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7609-merge-co-error-msgs.sh

@@ -37,14 +37,14 @@ EOF
 
 test_expect_success 'untracked files overwritten by merge (fast and non-fast forward)' '
 	test_must_fail git merge branch 2>out &&
-	test_cmp out expect &&
+	test_i18ncmp out expect &&
 	git commit --allow-empty -m empty &&
 	(
 		GIT_MERGE_VERBOSITY=0 &&
 		export GIT_MERGE_VERBOSITY &&
 		test_must_fail git merge branch 2>out2
 	) &&
-	test_cmp out2 expect &&
+	test_i18ncmp out2 expect &&
 	git reset --hard HEAD^
 '
 
@@ -53,7 +53,7 @@ error: Your local changes to the following files would be overwritten by merge:
 	four
 	three
 	two
-Please, commit your changes or stash them before you can merge.
+Please commit your changes or stash them before you can merge.
 error: The following untracked working tree files would be overwritten by merge:
 	five
 Please move or remove them before you can merge.
@@ -65,14 +65,14 @@ test_expect_success 'untracked files or local changes ovewritten by merge' '
 	git add three &&
 	git add four &&
 	test_must_fail git merge branch 2>out &&
-	test_cmp out expect
+	test_i18ncmp out expect
 '
 
 cat >expect <<\EOF
 error: Your local changes to the following files would be overwritten by checkout:
 	rep/one
 	rep/two
-Please, commit your changes or stash them before you can switch branches.
+Please commit your changes or stash them before you can switch branches.
 Aborting
 EOF
 
@@ -87,21 +87,21 @@ test_expect_success 'cannot switch branches because of local changes' '
 	echo uno >rep/one &&
 	echo dos >rep/two &&
 	test_must_fail git checkout branch 2>out &&
-	test_cmp out expect
+	test_i18ncmp out expect
 '
 
 cat >expect <<\EOF
 error: Your local changes to the following files would be overwritten by checkout:
 	rep/one
 	rep/two
-Please, commit your changes or stash them before you can switch branches.
+Please commit your changes or stash them before you can switch branches.
 Aborting
 EOF
 
 test_expect_success 'not uptodate file porcelain checkout error' '
 	git add rep/one rep/two &&
 	test_must_fail git checkout branch 2>out &&
-	test_cmp out expect
+	test_i18ncmp out expect
 '
 
 cat >expect <<\EOF
@@ -132,7 +132,7 @@ test_expect_success 'not_uptodate_dir porcelain checkout error' '
 	>rep/untracked-file &&
 	>rep2/untracked-file &&
 	test_must_fail git checkout branch 2>out &&
-	test_cmp out ../expect
+	test_i18ncmp out ../expect
 '
 
 test_done

unpack-trees.c

@@ -58,27 +58,61 @@ void setup_unpack_trees_porcelain(struct unpack_trees_options *opts,
 	int i;
 	const char **msgs = opts->msgs;
 	const char *msg;
-	const char *cmd2 = strcmp(cmd, "checkout") ? cmd : "switch branches";
 
-	if (advice_commit_before_merge)
+	if (!strcmp(cmd, "checkout"))
-		msg = _("Your local changes to the following files would be overwritten by %s:\n%%s"
+		msg = advice_commit_before_merge
-			"Please, commit your changes or stash them before you can %s.");
+		      ? _("Your local changes to the following files would be overwritten by checkout:\n%%s"
+			  "Please commit your changes or stash them before you can switch branches.")
+		      : _("Your local changes to the following files would be overwritten by checkout:\n%%s");
+	else if (!strcmp(cmd, "merge"))
+		msg = advice_commit_before_merge
+		      ? _("Your local changes to the following files would be overwritten by merge:\n%%s"
+			  "Please commit your changes or stash them before you can merge.")
+		      : _("Your local changes to the following files would be overwritten by merge:\n%%s");
 	else
-		msg = _("Your local changes to the following files would be overwritten by %s:\n%%s");
+		msg = advice_commit_before_merge
+		      ? _("Your local changes to the following files would be overwritten by %s:\n%%s"
+			  "Please commit your changes or stash them before you can %s.")
+		      : _("Your local changes to the following files would be overwritten by %s:\n%%s");
 	msgs[ERROR_WOULD_OVERWRITE] = msgs[ERROR_NOT_UPTODATE_FILE] =
-		xstrfmt(msg, cmd, cmd2);
+		xstrfmt(msg, cmd, cmd);
 
 	msgs[ERROR_NOT_UPTODATE_DIR] =
 		_("Updating the following directories would lose untracked files in it:\n%s");
 
-	if (advice_commit_before_merge)
+	if (!strcmp(cmd, "checkout"))
-		msg = _("The following untracked working tree files would be %s by %s:\n%%s"
+		msg = advice_commit_before_merge
-			"Please move or remove them before you can %s.");
+		      ? _("The following untracked working tree files would be removed by checkout:\n%%s"
+			  "Please move or remove them before you can switch branches.")
+		      : _("The following untracked working tree files would be removed by checkout:\n%%s");
+	else if (!strcmp(cmd, "merge"))
+		msg = advice_commit_before_merge
+		      ? _("The following untracked working tree files would be removed by merge:\n%%s"
+			  "Please move or remove them before you can merge.")
+		      : _("The following untracked working tree files would be removed by merge:\n%%s");
 	else
-		msg = _("The following untracked working tree files would be %s by %s:\n%%s");
+		msg = advice_commit_before_merge
-
+		      ? _("The following untracked working tree files would be removed by %s:\n%%s"
-	msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] = xstrfmt(msg, "removed", cmd, cmd2);
+			  "Please move or remove them before you can %s.")
-	msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] = xstrfmt(msg, "overwritten", cmd, cmd2);
+		      : _("The following untracked working tree files would be removed by %s:\n%%s");
+	msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] = xstrfmt(msg, cmd, cmd);
+
+	if (!strcmp(cmd, "checkout"))
+		msg = advice_commit_before_merge
+		      ? _("The following untracked working tree files would be overwritten by checkout:\n%%s"
+			  "Please move or remove them before you can switch branches.")
+		      : _("The following untracked working tree files would be overwritten by checkout:\n%%s");
+	else if (!strcmp(cmd, "merge"))
+		msg = advice_commit_before_merge
+		      ? _("The following untracked working tree files would be overwritten by merge:\n%%s"
+			  "Please move or remove them before you can merge.")
+		      : _("The following untracked working tree files would be overwritten by merge:\n%%s");
+	else
+		msg = advice_commit_before_merge
+		      ? _("The following untracked working tree files would be overwritten by %s:\n%%s"
+			  "Please move or remove them before you can %s.")
+		      : _("The following untracked working tree files would be overwritten by %s:\n%%s");
+	msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] = xstrfmt(msg, cmd, cmd);
 
 	/*
 	 * Special case: ERROR_BIND_OVERLAP refers to a pair of paths, we