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 <chrisc...@tuxfamily.org>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
trailer.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 84 insertions(+), 1 deletion(-)
diff --git a/trailer.c b/trailer.c
index b0be0d7..8514566 100644
--- a/trailer.c
+++ b/trailer.c
@@ -1,5 +1,7 @@
#include "cache.h"
#include "string-list.h"
+#include "run-command.h"
+#include "string-list.h"
#include "trailer.h"
/*
* Copyright (c) 2013, 2014 Christian Couder <chrisc...@tuxfamily.org>
@@ -33,6 +35,8 @@ static struct trailer_item *first_conf_item;
static char *separators = ":";
+#define TRAILER_ARG_STRING "$ARG"
+
static int after_or_end(enum action_where where)
{
return (where == WHERE_AFTER) || (where == WHERE_END);
@@ -78,6 +82,13 @@ 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);
@@ -203,6 +214,63 @@ static struct trailer_item *remove_first(struct
trailer_item **first)
return item;
}
+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);
+ result = xstrdup("");
+ } else
+ result = strbuf_detach(&buf, NULL);
+
+ strbuf_release(&cmd);
+ return result;
+}
+
+static void apply_item_command(struct trailer_item *in_tok, struct
trailer_item *arg_tok)
+{
+ if (arg_tok->conf.command) {
+ const char *arg;
+ if (arg_tok->value && arg_tok->value[0]) {
+ arg = arg_tok->value;
+ } else {
+ if (in_tok && in_tok->value)
+ arg = xstrdup(in_tok->value);
+ else
+ arg = xstrdup("");
+ }
+ arg_tok->value = apply_command(arg_tok->conf.command, arg);
+ free((char *)arg);
+ }
+}
+
static void apply_arg_if_exists(struct trailer_item *in_tok,
struct trailer_item *arg_tok,
struct trailer_item *on_tok,
@@ -214,16 +282,19 @@ static void apply_arg_if_exists(struct trailer_item
*in_tok,
free_trailer_item(arg_tok);
break;
case EXISTS_REPLACE:
+ apply_item_command(in_tok, arg_tok);
add_arg_to_input_list(on_tok, arg_tok,
in_tok_first, in_tok_last);
remove_from_list(in_tok, in_tok_first, in_tok_last);
free_trailer_item(in_tok);
break;
case EXISTS_ADD:
+ apply_item_command(in_tok, arg_tok);
add_arg_to_input_list(on_tok, arg_tok,
in_tok_first, in_tok_last);
break;
case EXISTS_ADD_IF_DIFFERENT:
+ apply_item_command(in_tok, arg_tok);
if (check_if_different(in_tok, arg_tok, 1))
add_arg_to_input_list(on_tok, arg_tok,
in_tok_first, in_tok_last);
@@ -231,6 +302,7 @@ static void apply_arg_if_exists(struct trailer_item *in_tok,
free_trailer_item(arg_tok);
break;
case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
+ apply_item_command(in_tok, arg_tok);
if (check_if_different(on_tok, arg_tok, 0))
add_arg_to_input_list(on_tok, arg_tok,
in_tok_first, in_tok_last);
@@ -254,6 +326,7 @@ static void apply_arg_if_missing(struct trailer_item
**in_tok_first,
case MISSING_ADD:
where = arg_tok->conf.where;
in_tok = after_or_end(where) ? in_tok_last : in_tok_first;
+ apply_item_command(NULL, arg_tok);
if (*in_tok) {
add_arg_to_input_list(*in_tok, arg_tok,
in_tok_first, in_tok_last);
@@ -537,7 +610,7 @@ static struct trailer_item *new_trailer_item(struct
trailer_item *conf_item,
char *tok, char *val)
{
struct trailer_item *new = xcalloc(sizeof(*new), 1);
- new->value = val;
+ new->value = val ? val : xstrdup("");
if (conf_item) {
duplicate_conf(&new->conf, &conf_item->conf);
@@ -604,7 +677,17 @@ static struct trailer_item
*process_command_line_args(struct string_list *traile
struct trailer_item *arg_tok_first = NULL;
struct trailer_item *arg_tok_last = NULL;
struct string_list_item *tr;
+ struct trailer_item *item;
+
+ /* Add a trailer item for each configured trailer with a command */
+ for (item = first_conf_item; item; item = item->next) {
+ if (item->conf.command) {
+ struct trailer_item *new = new_trailer_item(item, NULL,
NULL);
+ add_trailer_item(&arg_tok_first, &arg_tok_last, new);
+ }
+ }
+ /* Add a trailer item for each trailer on the command line */
for_each_string_list_item(tr, trailers) {
struct trailer_item *new = create_trailer_item(tr->string);
add_trailer_item(&arg_tok_first, &arg_tok_last, new);
--
2.1.0.rc0.248.gb91fdbc
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