Parse the trailer command line arguments and put
the result into an arg_tok doubly linked list.

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 trailer.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)

diff --git a/trailer.c b/trailer.c
index f7714d5..743ff23 100644
--- a/trailer.c
+++ b/trailer.c
@@ -391,3 +391,106 @@ static int git_trailer_config(const char *conf_key, const 
char *value, void *cb)
        }
        return 0;
 }
+
+static int parse_trailer(struct strbuf *tok, struct strbuf *val, const char 
*trailer)
+{
+       size_t len = strcspn(trailer, "=:");
+       if (len == 0)
+               return error(_("empty trailer token in trailer '%s'"), trailer);
+       if (len < strlen(trailer)) {
+               strbuf_add(tok, trailer, len);
+               strbuf_trim(tok);
+               strbuf_addstr(val, trailer + len + 1);
+               strbuf_trim(val);
+       } else {
+               strbuf_addstr(tok, trailer);
+               strbuf_trim(tok);
+       }
+       return 0;
+}
+
+
+static void duplicate_conf(struct conf_info *dst, struct conf_info *src)
+{
+       *dst = *src;
+       if (src->name)
+               dst->name = xstrdup(src->name);
+       if (src->key)
+               dst->key = xstrdup(src->key);
+       if (src->command)
+               dst->command = xstrdup(src->command);
+}
+
+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;
+
+       if (conf_item) {
+               duplicate_conf(&new->conf, &conf_item->conf);
+               new->token = xstrdup(conf_item->conf.key);
+               free(tok);
+       } else
+               new->token = tok;
+
+       return new;
+}
+
+static struct trailer_item *create_trailer_item(const char *string)
+{
+       struct strbuf tok = STRBUF_INIT;
+       struct strbuf val = STRBUF_INIT;
+       struct trailer_item *item;
+       int tok_alnum_len;
+
+       if (parse_trailer(&tok, &val, string))
+               return NULL;
+
+       tok_alnum_len = alnum_len(tok.buf, tok.len);
+
+       /* Lookup if the token matches something in the config */
+       for (item = first_conf_item; item; item = item->next) {
+               if (!strncasecmp(tok.buf, item->conf.key, tok_alnum_len) ||
+                   !strncasecmp(tok.buf, item->conf.name, tok_alnum_len)) {
+                       strbuf_release(&tok);
+                       return new_trailer_item(item,
+                                               NULL,
+                                               strbuf_detach(&val, NULL));
+               }
+       }
+
+       return new_trailer_item(NULL,
+                               strbuf_detach(&tok, NULL),
+                               strbuf_detach(&val, NULL));
+}
+
+static void add_trailer_item(struct trailer_item **first,
+                            struct trailer_item **last,
+                            struct trailer_item *new)
+{
+       if (!new)
+               return;
+       if (!*last) {
+               *first = new;
+               *last = new;
+       } else {
+               (*last)->next = new;
+               new->previous = *last;
+               *last = new;
+       }
+}
+
+static struct trailer_item *process_command_line_args(int argc, const char 
**argv)
+{
+       int i;
+       struct trailer_item *arg_tok_first = NULL;
+       struct trailer_item *arg_tok_last = NULL;
+
+       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);
+       }
+
+       return arg_tok_first;
+}
-- 
1.9.0.164.g3aa33cd.dirty


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