[PATCH 2/2] push: suggest <remote> <branch> for a slash slip

["Harald Nordgren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Harald Nordgren <haraldnordgren@gmail.com>

"git push origin/main" is treated as a repository and dies with
"'origin/main' does not appear to be a git repository", with no hint
that a space was meant instead of a slash.

When the argument is not an existing path or configured remote but its
part before the first slash names one, suggest the intended
"git push <remote> <branch>" form. The suggestion is shown as advice so
it can be silenced with advice.pushRepoLooksLikeRef.

Signed-off-by: Harald Nordgren <haraldnordgren@gmail.com>
---
 Documentation/config/advice.adoc |  5 +++++
 advice.c                         |  1 +
 advice.h                         |  1 +
 builtin/push.c                   | 26 +++++++++++++++++++++++++-
 t/t5529-push-errors.sh           | 31 +++++++++++++++++++++++++++++++
 5 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/Documentation/config/advice.adoc b/Documentation/config/advice.adoc
index 257db58918..fa77a5110e 100644
--- a/Documentation/config/advice.adoc
+++ b/Documentation/config/advice.adoc
@@ -90,6 +90,11 @@ all advice messages.
 		Shown when linkgit:git-push[1] rejects a forced update of
 		a branch when its remote-tracking ref has updates that we
 		do not have locally.
+	pushRepoLooksLikeRef::
+		Shown when the repository given to linkgit:git-push[1] is not
+		a configured remote but looks like a `<remote>/<branch>` ref,
+		suggesting that the remote and branch be given as separate
+		arguments.
 	pushUnqualifiedRefname::
 		Shown when linkgit:git-push[1] gives up trying to
 		guess based on the source and destination refs what
diff --git a/advice.c b/advice.c
index 0018501b7b..63bf8b0c5f 100644
--- a/advice.c
+++ b/advice.c
@@ -69,6 +69,7 @@ static struct {
 	[ADVICE_PUSH_NON_FF_CURRENT]			= { "pushNonFFCurrent" },
 	[ADVICE_PUSH_NON_FF_MATCHING]			= { "pushNonFFMatching" },
 	[ADVICE_PUSH_REF_NEEDS_UPDATE]			= { "pushRefNeedsUpdate" },
+	[ADVICE_PUSH_REPO_LOOKS_LIKE_REF]		= { "pushRepoLooksLikeRef" },
 	[ADVICE_PUSH_UNQUALIFIED_REF_NAME]		= { "pushUnqualifiedRefName" },
 	[ADVICE_PUSH_UPDATE_REJECTED]			= { "pushUpdateRejected" },
 	[ADVICE_PUSH_UPDATE_REJECTED_ALIAS]		= { "pushNonFastForward" }, /* backwards compatibility */
diff --git a/advice.h b/advice.h
index 8def280688..66f6cd6a77 100644
--- a/advice.h
+++ b/advice.h
@@ -36,6 +36,7 @@ enum advice_type {
 	ADVICE_PUSH_NON_FF_CURRENT,
 	ADVICE_PUSH_NON_FF_MATCHING,
 	ADVICE_PUSH_REF_NEEDS_UPDATE,
+	ADVICE_PUSH_REPO_LOOKS_LIKE_REF,
 	ADVICE_PUSH_UNQUALIFIED_REF_NAME,
 	ADVICE_PUSH_UPDATE_REJECTED,
 	ADVICE_PUSH_UPDATE_REJECTED_ALIAS,
diff --git a/builtin/push.c b/builtin/push.c
index 6021b71d66..c21febadbe 100644
--- a/builtin/push.c
+++ b/builtin/push.c
@@ -8,6 +8,7 @@
 #include "advice.h"
 #include "branch.h"
 #include "config.h"
+#include "dir.h"
 #include "environment.h"
 #include "gettext.h"
 #include "hex.h"
@@ -744,6 +745,29 @@ int cmd_push(int argc,
 
 	if (repo) {
 		if (!add_remote_or_group(repo, &remote_group)) {
+			const char *slash = strchr(repo, '/');
+			struct remote *r;
+
+			/*
+			 * A "<remote>/<branch>" argument that does not name
+			 * a path is likely a slip for the separate
+			 * "<remote> <branch>" form, so suggest that instead.
+			 */
+			if (slash && slash[1] && !file_exists(repo)) {
+				struct strbuf name = STRBUF_INIT;
+
+				strbuf_add(&name, repo, slash - repo);
+				if (remote_is_configured(remote_get(name.buf), 0)) {
+					int code = die_message(_("'%s' is not a valid push target"), repo);
+					advise_if_enabled(ADVICE_PUSH_REPO_LOOKS_LIKE_REF,
+							  _("Did you mean to use: git push %s %s?"),
+							  name.buf, slash + 1);
+					strbuf_release(&name);
+					exit(code);
+				}
+				strbuf_release(&name);
+			}
+
 			/*
 			 * Not a configured remote name or group name.
 			 * Try treating it as a direct URL or path, e.g.
@@ -753,7 +777,7 @@ int cmd_push(int argc,
 			 * from the URL so the loop below can handle it
 			 * identically to a named remote.
 			 */
-			struct remote *r = pushremote_get(repo);
+			r = pushremote_get(repo);
 			if (!r)
 				die(_("bad repository '%s'"), repo);
 			string_list_append(&remote_group, r->name);
diff --git a/t/t5529-push-errors.sh b/t/t5529-push-errors.sh
index 80b06a0cd2..cfb294305d 100755
--- a/t/t5529-push-errors.sh
+++ b/t/t5529-push-errors.sh
@@ -54,6 +54,37 @@ test_expect_success 'detect empty remote with targeted refspec' '
 	grep "fatal: bad repository ${SQ}${SQ}" stderr
 '
 
+test_expect_success 'suggest <remote> <branch> for a <remote>/<branch> slip' '
+	test_must_fail git push origin/main 2>stderr &&
+	grep "${SQ}origin/main${SQ} is not a valid push target" stderr &&
+	grep "hint: Did you mean to use: git push origin main?" stderr &&
+	test_must_fail git -c advice.pushRepoLooksLikeRef=false push origin/main 2>stderr &&
+	! grep "Did you mean" stderr
+'
+
+test_expect_success 'suggest <remote> <branch> when the branch has slashes' '
+	test_must_fail git push origin/feature/x 2>stderr &&
+	grep "hint: Did you mean to use: git push origin feature/x?" stderr
+'
+
+test_expect_success 'no suggestion when prefix is not a configured remote' '
+	test_must_fail git push not-a-remote/main 2>stderr &&
+	! grep "Did you mean" stderr
+'
+
+test_expect_success 'no suggestion for a trailing slash with no branch' '
+	test_must_fail git push origin/ 2>stderr &&
+	! grep "Did you mean" stderr
+'
+
+test_expect_success 'no suggestion when the argument is an existing path' '
+	test_when_finished "rm -rf origin" &&
+	git init --bare origin/main &&
+	git push origin/main HEAD:refs/heads/pushed 2>stderr &&
+	! grep "Did you mean" stderr &&
+	git -C origin/main rev-parse --verify refs/heads/pushed
+'
+
 test_expect_success 'detect ambiguous refs early' '
 	git branch foo &&
 	git tag foo &&
-- 
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