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authorMichael Haggerty <mhagger@alum.mit.edu>2012-09-12 16:04:44 +0200
committerJunio C Hamano <gitster@pobox.com>2012-09-12 11:43:25 -0700
commiteb5f0c7a616531a024a582b72ca6d8775ff98d46 (patch)
tree1c791a163140cb2988c7d2049ce706ad93e0c23d /test-string-list.c
parentff919f965d20d003e3882c70de667f41a86349ac (diff)
downloadgit-eb5f0c7a616531a024a582b72ca6d8775ff98d46.tar.gz
git-eb5f0c7a616531a024a582b72ca6d8775ff98d46.tar.xz
string_list: add a new function, filter_string_list()
This function allows entries that don't match a specified criterion to be discarded from a string_list while preserving the order of the remaining entries. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'test-string-list.c')
-rw-r--r--test-string-list.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/test-string-list.c b/test-string-list.c
index cdc3cf3a7..702276c1f 100644
--- a/test-string-list.c
+++ b/test-string-list.c
@@ -1,6 +1,20 @@
#include "cache.h"
#include "string-list.h"
+/*
+ * Parse an argument into a string list. arg should either be a
+ * ':'-separated list of strings, or "-" to indicate an empty string
+ * list (as opposed to "", which indicates a string list containing a
+ * single empty string). list->strdup_strings must be set.
+ */
+void parse_string_list(struct string_list *list, const char *arg)
+{
+ if (!strcmp(arg, "-"))
+ return;
+
+ (void)string_list_split(list, arg, ':', -1);
+}
+
void write_list(const struct string_list *list)
{
int i;
@@ -8,6 +22,25 @@ void write_list(const struct string_list *list)
printf("[%d]: \"%s\"\n", i, list->items[i].string);
}
+void write_list_compact(const struct string_list *list)
+{
+ int i;
+ if (!list->nr)
+ printf("-\n");
+ else {
+ printf("%s", list->items[0].string);
+ for (i = 1; i < list->nr; i++)
+ printf(":%s", list->items[i].string);
+ printf("\n");
+ }
+}
+
+int prefix_cb(struct string_list_item *item, void *cb_data)
+{
+ const char *prefix = (const char *)cb_data;
+ return !prefixcmp(item->string, prefix);
+}
+
int main(int argc, char **argv)
{
if (argc == 5 && !strcmp(argv[1], "split")) {
@@ -39,6 +72,21 @@ int main(int argc, char **argv)
return 0;
}
+ if (argc == 4 && !strcmp(argv[1], "filter")) {
+ /*
+ * Retain only the items that have the specified prefix.
+ * Arguments: list|- prefix
+ */
+ struct string_list list = STRING_LIST_INIT_DUP;
+ const char *prefix = argv[3];
+
+ parse_string_list(&list, argv[2]);
+ filter_string_list(&list, 0, prefix_cb, (void *)prefix);
+ write_list_compact(&list);
+ string_list_clear(&list, 0);
+ return 0;
+ }
+
fprintf(stderr, "%s: unknown function name: %s\n", argv[0],
argv[1] ? argv[1] : "(there was none)");
return 1;