Merge branch 'mingw/ref-filter-remote-name'

This reflects v2 of the ref-filter-remote-name branch, submitted as:

https://public-inbox.org/git/cover.1507205895.git.johannes.schindelin@gmx.de

The only addition is a fourth patch that marks all of this shebang as
experimental, subject to design changes without prior warning.

By exposing this as an experimental feature to users, hopefully this
patch series will mature quicker (not so much in the "beautiful code"
sense, but more in the "does it work in practice" sense).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Documentation/git-for-each-ref.txt

@@ -145,18 +145,22 @@ upstream::
 	(behind), "<>" (ahead and behind), or "=" (in sync). `:track`
 	also prints "[gone]" whenever unknown upstream ref is
 	encountered. Append `:track,nobracket` to show tracking
-	information without brackets (i.e "ahead N, behind M").  Has
-	no effect if the ref does not have tracking information
-	associated with it.  All the options apart from `nobracket`
-	are mutually exclusive, but if used together the last option
-	is selected.
+	information without brackets (i.e "ahead N, behind M").
++
+(EXPERIMENTAL) Also respects `:remotename` to state the name of the
+*remote* instead of the ref, and `:remoteref` to state the name of
+the *reference* as locally known by the remote.
++
+Has no effect if the ref does not have tracking information associated
+with it.  All the options apart from `nobracket` are mutually exclusive,
+but if used together the last option is selected.
 
 push::
 	The name of a local ref which represents the `@{push}`
 	location for the displayed ref. Respects `:short`, `:lstrip`,
-	`:rstrip`, `:track`, and `:trackshort` options as `upstream`
-	does. Produces an empty string if no `@{push}` ref is
-	configured.
+	`:rstrip`, `:track`, `:trackshort`, (EXPERIMENTAL) `:remotename`,
+	and (EXPERIMENTAL) `:remoteref` options as `upstream` does.
+	Produces an empty string if no `@{push}` ref is configured.
 
 HEAD::
 	'*' if HEAD matches current ref (the checked out branch), ' '

ref-filter.c

@@ -76,9 +76,11 @@ static struct used_atom {
 		char color[COLOR_MAXLEN];
 		struct align align;
 		struct {
-			enum { RR_REF, RR_TRACK, RR_TRACKSHORT } option;
+			enum {
+				RR_REF, RR_TRACK, RR_TRACKSHORT, RR_REMOTE_NAME, RR_REMOTE_REF
+			} option;
 			struct refname_atom refname;
-			unsigned int nobracket : 1;
+			unsigned int nobracket : 1, push : 1, push_remote : 1;
 		} remote_ref;
 		struct {
 			enum { C_BARE, C_BODY, C_BODY_DEP, C_LINES, C_SIG, C_SUB, C_TRAILERS } option;
@@ -138,6 +140,9 @@ static void remote_ref_atom_parser(const struct ref_format *format, struct used_
 	struct string_list params = STRING_LIST_INIT_DUP;
 	int i;
 
+	if (!strcmp(atom->name, "push") || starts_with(atom->name, "push:"))
+		atom->u.remote_ref.push = 1;
+
 	if (!arg) {
 		atom->u.remote_ref.option = RR_REF;
 		refname_atom_parser_internal(&atom->u.remote_ref.refname,
@@ -157,7 +162,13 @@ static void remote_ref_atom_parser(const struct ref_format *format, struct used_
 			atom->u.remote_ref.option = RR_TRACKSHORT;
 		else if (!strcmp(s, "nobracket"))
 			atom->u.remote_ref.nobracket = 1;
-		else {
+		else if (!strcmp(s, "remotename")) {
+			atom->u.remote_ref.option = RR_REMOTE_NAME;
+			atom->u.remote_ref.push_remote = 1;
+		} else if (!strcmp(s, "remoteref")) {
+			atom->u.remote_ref.option = RR_REMOTE_REF;
+			atom->u.remote_ref.push_remote = 1;
+		} else {
 			atom->u.remote_ref.option = RR_REF;
 			refname_atom_parser_internal(&atom->u.remote_ref.refname,
 						     arg, atom->name);
@@ -1268,6 +1279,25 @@ static void fill_remote_ref_details(struct used_atom *atom, const char *refname,
 			*s = ">";
 		else
 			*s = "<>";
+	} else if (atom->u.remote_ref.option == RR_REMOTE_NAME) {
+		int explicit;
+		const char *remote = atom->u.remote_ref.push ?
+			pushremote_for_branch(branch, &explicit) :
+			remote_for_branch(branch, &explicit);
+		if (explicit)
+			*s = xstrdup(remote);
+		else
+			*s = "";
+	} else if (atom->u.remote_ref.option == RR_REMOTE_REF) {
+		int explicit;
+		const char *merge;
+
+		merge = remote_ref_for_branch(branch, atom->u.remote_ref.push,
+					      &explicit);
+		if (explicit)
+			*s = xstrdup(merge);
+		else
+			*s = "";
 	} else
 		die("BUG: unhandled RR_* enum");
 }
@@ -1377,16 +1407,20 @@ static void populate_value(struct ref_array_item *ref)
 			if (refname)
 				fill_remote_ref_details(atom, refname, branch, &v->s);
 			continue;
-		} else if (starts_with(name, "push")) {
+		} else if (atom->u.remote_ref.push) {
 			const char *branch_name;
 			if (!skip_prefix(ref->refname, "refs/heads/",
 					 &branch_name))
 				continue;
 			branch = branch_get(branch_name);
 
-			refname = branch_get_push(branch, NULL);
-			if (!refname)
-				continue;
+			if (atom->u.remote_ref.push_remote)
+				refname = NULL;
+			else {
+				refname = branch_get_push(branch, NULL);
+				if (!refname)
+					continue;
+			}
 			fill_remote_ref_details(atom, refname, branch, &v->s);
 			continue;
 		} else if (starts_with(name, "color:")) {

remote.c

@@ -675,6 +675,36 @@ const char *pushremote_for_branch(struct branch *branch, int *explicit)
 	return remote_for_branch(branch, explicit);
 }
 
+const char *remote_ref_for_branch(struct branch *branch, int for_push,
+				  int *explicit)
+{
+	if (branch) {
+		if (!for_push) {
+			if (branch->merge_nr) {
+				if (explicit)
+					*explicit = 1;
+				return branch->merge_name[0];
+			}
+		} else {
+			const char *dst, *remote_name =
+				pushremote_for_branch(branch, NULL);
+			struct remote *remote = remote_get(remote_name);
+
+			if (remote && remote->push_refspec_nr &&
+			    (dst = apply_refspecs(remote->push,
+						  remote->push_refspec_nr,
+						  branch->refname))) {
+				if (explicit)
+					*explicit = 1;
+				return dst;
+			}
+		}
+	}
+	if (explicit)
+		*explicit = 0;
+	return "";
+}
+
 static struct remote *remote_get_1(const char *name,
 				   const char *(*get_default)(struct branch *, int *))
 {

remote.h

@@ -223,6 +223,8 @@ struct branch {
 struct branch *branch_get(const char *name);
 const char *remote_for_branch(struct branch *branch, int *explicit);
 const char *pushremote_for_branch(struct branch *branch, int *explicit);
+const char *remote_ref_for_branch(struct branch *branch, int for_push,
+				  int *explicit);
 
 int branch_has_merge_config(struct branch *branch);
 int branch_merge_matches(struct branch *, int n, const char *);

t/t6300-for-each-ref.sh

@@ -766,4 +766,36 @@ test_expect_success 'Verify usage of %(symref:rstrip) atom' '
 	test_cmp expected actual
 '
 
+test_expect_success ':remotename and :remoteref' '
+	git init remote-tests &&
+	(
+		cd remote-tests &&
+		test_commit initial &&
+		git remote add from fifth.coffee:blub &&
+		git config branch.master.remote from &&
+		git config branch.master.merge refs/heads/stable &&
+		git remote add to southridge.audio:repo &&
+		git config remote.to.push "refs/heads/*:refs/heads/pushed/*" &&
+		git config branch.master.pushRemote to &&
+		for pair in "%(upstream)=refs/remotes/from/stable" \
+			"%(upstream:remotename)=from" \
+			"%(upstream:remoteref)=refs/heads/stable" \
+			"%(push)=refs/remotes/to/pushed/master" \
+			"%(push:remotename)=to" \
+			"%(push:remoteref)=refs/heads/pushed/master"
+		do
+			echo "${pair#*=}" >expect &&
+			git for-each-ref --format="${pair%=*}" \
+				refs/heads/master >actual &&
+			test_cmp expect actual
+		done &&
+		git branch push-simple &&
+		git config branch.push-simple.pushRemote from &&
+		actual="$(git for-each-ref \
+			--format="%(push:remotename),%(push:remoteref)" \
+			refs/heads/push-simple)" &&
+		test from, = "$actual"
+	)
+'
+
 test_done