Let the user specify a command that will give on its standard output
the value to use for the specified trailer.
Signed-off-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
---
trailer.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
diff --git a/trailer.c b/trailer.c
index 5d2b3ad..bc96643 100644
--- a/trailer.c
+++ b/trailer.c
@@ -1,4 +1,5 @@
#include "cache.h"
+#include "run-command.h"
#include "trailer.h"
/*
* Copyright (c) 2013, 2014 Christian Couder <chriscool@xxxxxxxxxxxxx>
@@ -13,11 +14,14 @@ struct conf_info {
char *name;
char *key;
char *command;
+ unsigned command_uses_arg : 1;
enum action_where where;
enum action_if_exists if_exists;
enum action_if_missing if_missing;
};
+#define TRAILER_ARG_STRING "$ARG"
+
struct trailer_item {
struct trailer_item *previous;
struct trailer_item *next;
@@ -59,6 +63,13 @@ static inline int contains_only_spaces(const char *str)
return !*s;
}
+static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
+{
+ const char *ptr = strstr(sb->buf, a);
+ if (ptr)
+ strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
+}
+
static void free_trailer_item(struct trailer_item *item)
{
free(item->conf.name);
@@ -402,6 +413,7 @@ static int git_trailer_config(const char *conf_key, const char *value, void *cb)
if (conf->command)
warning(_("more than one %s"), conf_key);
conf->command = xstrdup(value);
+ conf->command_uses_arg = !!strstr(conf->command, TRAILER_ARG_STRING);
break;
case TRAILER_WHERE:
if (set_where(conf, value))
@@ -438,6 +450,44 @@ static int parse_trailer(struct strbuf *tok, struct strbuf *val, const char *tra
return 0;
}
+static int read_from_command(struct child_process *cp, struct strbuf *buf)
+{
+ if (run_command(cp))
+ return error("running trailer command '%s' failed", cp->argv[0]);
+ if (strbuf_read(buf, cp->out, 1024) < 1)
+ return error("reading from trailer command '%s' failed", cp->argv[0]);
+ strbuf_trim(buf);
+ return 0;
+}
+
+static const char *apply_command(const char *command, const char *arg)
+{
+ struct strbuf cmd = STRBUF_INIT;
+ struct strbuf buf = STRBUF_INIT;
+ struct child_process cp;
+ const char *argv[] = {NULL, NULL};
+ const char *result = "";
+
+ strbuf_addstr(&cmd, command);
+ if (arg)
+ strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
+
+ argv[0] = cmd.buf;
+ memset(&cp, 0, sizeof(cp));
+ cp.argv = argv;
+ cp.env = local_repo_env;
+ cp.no_stdin = 1;
+ cp.out = -1;
+ cp.use_shell = 1;
+
+ if (read_from_command(&cp, &buf))
+ strbuf_release(&buf);
+ else
+ result = strbuf_detach(&buf, NULL);
+
+ strbuf_release(&cmd);
+ return result;
+}
static void duplicate_conf(struct conf_info *dst, struct conf_info *src)
{
@@ -460,6 +510,10 @@ static struct trailer_item *new_trailer_item(struct trailer_item *conf_item,
duplicate_conf(&new->conf, &conf_item->conf);
new->token = xstrdup(conf_item->conf.key);
free(tok);
+ if (conf_item->conf.command_uses_arg || !val) {
+ new->value = apply_command(conf_item->conf.command, val);
+ free(val);
+ }
} else
new->token = tok;
@@ -515,12 +569,21 @@ static struct trailer_item *process_command_line_args(int argc, const char **arg
int i;
struct trailer_item *arg_tok_first = NULL;
struct trailer_item *arg_tok_last = NULL;
+ struct trailer_item *item;
for (i = 0; i < argc; i++) {
struct trailer_item *new = create_trailer_item(argv[i]);
add_trailer_item(&arg_tok_first, &arg_tok_last, new);
}
+ /* Add conf commands that don't use $ARG */
+ for (item = first_conf_item; item; item = item->next) {
+ if (item->conf.command && !item->conf.command_uses_arg) {
+ struct trailer_item *new = new_trailer_item(item, NULL, NULL);
+ add_trailer_item(&arg_tok_first, &arg_tok_last, new);
+ }
+ }
+
return arg_tok_first;
}
--
1.9.0.164.g3aa33cd.dirty
--
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