1 files changed, 119 insertions, 0 deletions
diff --git a/advice.c b/advice.c
new file mode 100644
index 0000000000..4dc5cf10a8
--- /dev/null
+++ b/advice.c
@@ -0,0 +1,119 @@
+#include "cache.h"
+
+int advice_push_update_rejected = 1;
+int advice_push_non_ff_current = 1;
+int advice_push_non_ff_matching = 1;
+int advice_push_already_exists = 1;
+int advice_push_fetch_first = 1;
+int advice_push_needs_force = 1;
+int advice_status_hints = 1;
+int advice_status_u_option = 1;
+int advice_commit_before_merge = 1;
+int advice_resolve_conflict = 1;
+int advice_implicit_identity = 1;
+int advice_detached_head = 1;
+int advice_set_upstream_failure = 1;
+int advice_object_name_warning = 1;
+int advice_rm_hints = 1;
+
+static struct {
+	const char *name;
+	int *preference;
+} advice_config[] = {
+	{ "pushupdaterejected", &advice_push_update_rejected },
+	{ "pushnonffcurrent", &advice_push_non_ff_current },
+	{ "pushnonffmatching", &advice_push_non_ff_matching },
+	{ "pushalreadyexists", &advice_push_already_exists },
+	{ "pushfetchfirst", &advice_push_fetch_first },
+	{ "pushneedsforce", &advice_push_needs_force },
+	{ "statushints", &advice_status_hints },
+	{ "statusuoption", &advice_status_u_option },
+	{ "commitbeforemerge", &advice_commit_before_merge },
+	{ "resolveconflict", &advice_resolve_conflict },
+	{ "implicitidentity", &advice_implicit_identity },
+	{ "detachedhead", &advice_detached_head },
+	{ "setupstreamfailure", &advice_set_upstream_failure },
+	{ "objectnamewarning", &advice_object_name_warning },
+	{ "rmhints", &advice_rm_hints },
+
+	/* make this an alias for backward compatibility */
+	{ "pushnonfastforward", &advice_push_update_rejected }
+};
+
+void advise(const char *advice, ...)
+{
+	struct strbuf buf = STRBUF_INIT;
+	va_list params;
+	const char *cp, *np;
+
+	va_start(params, advice);
+	strbuf_vaddf(&buf, advice, params);
+	va_end(params);
+
+	for (cp = buf.buf; *cp; cp = np) {
+		np = strchrnul(cp, '\n');
+		fprintf(stderr,	_("hint: %.*s\n"), (int)(np - cp), cp);
+		if (*np)
+			np++;
+	}
+	strbuf_release(&buf);
+}
+
+int git_default_advice_config(const char *var, const char *value)
+{
+	const char *k;
+	int i;
+
+	if (!skip_prefix(var, "advice.", &k))
+		return 0;
+
+	for (i = 0; i < ARRAY_SIZE(advice_config); i++) {
+		if (strcmp(k, advice_config[i].name))
+			continue;
+		*advice_config[i].preference = git_config_bool(var, value);
+		return 0;
+	}
+
+	return 0;
+}
+
+int error_resolve_conflict(const char *me)
+{
+	error("%s is not possible because you have unmerged files.", me);
+	if (advice_resolve_conflict)
+		/*
+		 * Message used both when 'git commit' fails and when
+		 * other commands doing a merge do.
+		 */
+		advise(_("Fix them up in the work tree, and then use 'git add/rm <file>'\n"
+			 "as appropriate to mark resolution and make a commit."));
+	return -1;
+}
+
+void NORETURN die_resolve_conflict(const char *me)
+{
+	error_resolve_conflict(me);
+	die("Exiting because of an unresolved conflict.");
+}
+
+void NORETURN die_conclude_merge(void)
+{
+	error(_("You have not concluded your merge (MERGE_HEAD exists)."));
+	if (advice_resolve_conflict)
+		advise(_("Please, commit your changes before merging."));
+	die(_("Exiting because of unfinished merge."));
+}
+
+void detach_advice(const char *new_name)
+{
+	const char fmt[] =
+	"Note: checking out '%s'.\n\n"
+	"You are in 'detached HEAD' state. You can look around, make experimental\n"
+	"changes and commit them, and you can discard any commits you make in this\n"
+	"state without impacting any branches by performing another checkout.\n\n"
+	"If you want to create a new branch to retain commits you create, you may\n"
+	"do so (now or later) by using -b with the checkout command again. Example:\n\n"
+	"  git checkout -b <new-branch-name>\n\n";
+
+	fprintf(stderr, fmt, new_name);
+}