[PATCH v1 2/8] Add initial support for many promisor remotes

[Christian Couder <christian.couder@gmail.com>]

From: Christian Couder <christian.couder@gmail.com>

The promisor-remote.{c,h} files will contain functions to
manage many promisor remotes.

We expect that there will not be a lot of promisor remotes,
so it is ok to use a simple linked list to manage them.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 Makefile          |  1 +
 promisor-remote.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++
 promisor-remote.h | 17 +++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 promisor-remote.c
 create mode 100644 promisor-remote.h

diff --git a/Makefile b/Makefile
index 1a44c811aa..565a5fbb4e 100644
--- a/Makefile
+++ b/Makefile
@@ -949,6 +949,7 @@ LIB_OBJS += preload-index.o
 LIB_OBJS += pretty.o
 LIB_OBJS += prio-queue.o
 LIB_OBJS += progress.o
+LIB_OBJS += promisor-remote.o
 LIB_OBJS += prompt.o
 LIB_OBJS += protocol.o
 LIB_OBJS += quote.o
diff --git a/promisor-remote.c b/promisor-remote.c
new file mode 100644
index 0000000000..701f5a351b
--- /dev/null
+++ b/promisor-remote.c
@@ -0,0 +1,90 @@
+#include "cache.h"
+#include "promisor-remote.h"
+#include "config.h"
+
+static struct promisor_remote *promisors;
+static struct promisor_remote **promisors_tail = &promisors;
+
+struct promisor_remote *promisor_remote_new(const char *remote_name)
+{
+	struct promisor_remote *o;
+
+	o = xcalloc(1, sizeof(*o));
+	o->remote_name = xstrdup(remote_name);
+
+	*promisors_tail = o;
+	promisors_tail = &o->next;
+
+	return o;
+}
+
+static struct promisor_remote *do_find_promisor_remote(const char *remote_name)
+{
+	struct promisor_remote *o;
+
+	for (o = promisors; o; o = o->next)
+		if (o->remote_name && !strcmp(o->remote_name, remote_name))
+			return o;
+
+	return NULL;
+}
+
+static int promisor_remote_config(const char *var, const char *value, void *data)
+{
+	struct promisor_remote *o;
+	const char *name;
+	int namelen;
+	const char *subkey;
+
+	if (parse_config_key(var, "remote", &name, &namelen, &subkey) < 0)
+		return 0;
+
+	if (!strcmp(subkey, "promisor")) {
+		char *remote_name;
+
+		if (!git_config_bool(var, value))
+			return 0;
+
+		remote_name = xmemdupz(name, namelen);
+
+		if (do_find_promisor_remote(remote_name)) {
+			free(remote_name);
+			return error(_("when parsing config key '%s' "
+				       "promisor remote '%s' already exists"),
+				     var, remote_name);
+		}
+
+		promisor_remote_new(remote_name);
+
+		free(remote_name);
+		return 0;
+	}
+
+	return 0;
+}
+
+static void promisor_remote_init(void)
+{
+	static int initialized;
+
+	if (initialized)
+		return;
+	initialized = 1;
+
+	git_config(promisor_remote_config, NULL);
+}
+
+struct promisor_remote *find_promisor_remote(const char *remote_name)
+{
+	promisor_remote_init();
+
+	if (!remote_name)
+		return promisors;
+
+	return do_find_promisor_remote(remote_name);
+}
+
+int has_promisor_remote(void)
+{
+	return !!find_promisor_remote(NULL);
+}
diff --git a/promisor-remote.h b/promisor-remote.h
new file mode 100644
index 0000000000..d07ac07a43
--- /dev/null
+++ b/promisor-remote.h
@@ -0,0 +1,17 @@
+#ifndef PROMISOR_REMOTE_H
+#define PROMISOR_REMOTE_H
+
+/*
+ * Promisor remote linked list
+ * Its information come from remote.XXX config entries.
+ */
+struct promisor_remote {
+	const char *remote_name;
+	struct promisor_remote *next;
+};
+
+extern struct promisor_remote *promisor_remote_new(const char *remote_name);
+extern struct promisor_remote *find_promisor_remote(const char *remote_name);
+extern int has_promisor_remote(void);
+
+#endif /* PROMISOR_REMOTE_H */
-- 
2.20.0.rc2.14.g1379de12fa.dirty