Add a perl-compatible regular expression version of the --match option,
which allows more flexible pattern matching.
Signed-off-by: Mostyn Bramley-Moore <mostynb@xxxxxxxxx>
---
Documentation/git-describe.txt | 5 +++
builtin/describe.c | 69 ++++++++++++++++++++++++++++++++++++++++++
t/README | 3 +-
t/t6120-describe.sh | 29 +++++++++++++++---
4 files changed, 101 insertions(+), 5 deletions(-)
diff --git a/Documentation/git-describe.txt b/Documentation/git-describe.txt
index c8f28c8..f646560 100644
--- a/Documentation/git-describe.txt
+++ b/Documentation/git-describe.txt
@@ -85,6 +85,11 @@ OPTIONS
excluding the "refs/tags/" prefix. This can be used to avoid
leaking private tags from the repository.
+--pcre-match <pattern>::
+ Only consider tags matching the given `PCRE` pattern,
+ excluding the "refs/tags/" prefix. This can be used to avoid
+ leaking private tags from the repository.
+
--always::
Show uniquely abbreviated commit object as fallback.
diff --git a/builtin/describe.c b/builtin/describe.c
index 2386c64..7ceecd7 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -10,6 +10,10 @@
#include "hashmap.h"
#include "argv-array.h"
+#ifdef USE_LIBPCRE
+#include <pcre.h>
+#endif
+
#define SEEN (1u << 0)
#define MAX_TAGS (FLAG_BITS - 1)
@@ -32,6 +36,12 @@ static const char *pattern;
static int always;
static const char *dirty;
+#ifdef USE_LIBPCRE
+static pcre *regex = NULL;
+static pcre_extra *extra = NULL;
+static const char *pcre_pattern = NULL;
+#endif
+
/* diff-index command arguments to check if working tree is dirty. */
static const char *diff_index_args[] = {
"diff-index", "--quiet", "HEAD", "--", NULL
@@ -119,6 +129,47 @@ static void add_to_known_names(const char *path,
}
}
+#ifdef USE_LIBPCRE
+static void pcre_init()
+{
+ const char *error = NULL;
+ int erroffset = -1;
+ int opts = PCRE_MULTILINE;
+
+ regex = pcre_compile(pcre_pattern, opts, &error, &erroffset, NULL);
+ if (!regex)
+ die("invalid PCRE at position %d of \'%s\': %s",
+ erroffset, pcre_pattern, error);
+
+ extra = pcre_study(regex, 0, &error);
+ if (!extra && error)
+ die("%s", error);
+}
+
+static void pcre_cleanup()
+{
+ pcre_free(regex);
+ regex = NULL;
+ pcre_free(extra);
+ extra = NULL;
+}
+
+/* return 1 on match, 0 on no match. */
+static int pcre_match(const char *pattern, const char *text)
+{
+ int ovector[30], flags = 0; // FIXME: ovector size ... ?
+ int ret = pcre_exec(regex, extra,
+ text, strlen(text), 0,
+ flags, ovector, ARRAY_SIZE(ovector));
+ if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
+ die("pcre_exec failed with error code %d", ret);
+ if (ret > 0)
+ return 0; /* no match */
+
+ return 1; /* match */
+}
+#endif
+
static int get_name(const char *path, const struct object_id *oid, int flag, void *cb_data)
{
int is_tag = starts_with(path, "refs/tags/");
@@ -132,6 +183,10 @@ static int get_name(const char *path, const struct object_id *oid, int flag, voi
/* Accept only tags that match the pattern, if given */
if (pattern && (!is_tag || wildmatch(pattern, path + 10, 0, NULL)))
return 0;
+#ifdef USE_LIBPCRE
+ if (pcre_pattern && (!is_tag || pcre_match(pcre_pattern, path + 10)))
+ return 0;
+#endif
/* Is it annotated? */
if (!peel_ref(path, peeled.hash)) {
@@ -406,6 +461,10 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
N_("consider <n> most recent tags (default: 10)")),
OPT_STRING(0, "match", &pattern, N_("glob"),
N_("only consider tags matching <glob>")),
+#ifdef USE_LIBPCRE
+ OPT_STRING(0, "pcre-match", &pcre_pattern, N_("regex"),
+ N_("only consider tags matching PCRE <regex>")),
+#endif
OPT_BOOL(0, "always", &always,
N_("show abbreviated commit object as fallback")),
{OPTION_STRING, 0, "dirty", &dirty, N_("mark"),
@@ -429,6 +488,11 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
if (longformat && abbrev == 0)
die(_("--long is incompatible with --abbrev=0"));
+#ifdef USE_LIBPCRE
+ if (pcre_pattern)
+ pcre_init();
+#endif
+
if (contains) {
struct argv_array args;
@@ -455,6 +519,11 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
if (!names.size && !always)
die(_("No names found, cannot describe anything."));
+#ifdef USE_LIBPCRE
+ if (pcre_pattern)
+ pcre_cleanup();
+#endif
+
if (argc == 0) {
if (dirty) {
static struct lock_file index_lock;
diff --git a/t/README b/t/README
index 1dc908e..1495f59 100644
--- a/t/README
+++ b/t/README
@@ -798,7 +798,8 @@ use these, and "test_set_prereq" for how to define your own.
- LIBPCRE
Git was compiled with USE_LIBPCRE=YesPlease. Wrap any tests
- that use git-grep --perl-regexp or git-grep -P in these.
+ that use git-grep --perl-regexp, git-grep -P or
+ git describe --pcre-matches in these.
- CASE_INSENSITIVE_FS
diff --git a/t/t6120-describe.sh b/t/t6120-describe.sh
index 85f2694..8290dea 100755
--- a/t/t6120-describe.sh
+++ b/t/t6120-describe.sh
@@ -12,13 +12,14 @@ test_description='test describe
'
. ./test-lib.sh
-check_describe () {
- expect="$1"
- shift
+_check_describe () {
+ pcre="$1"
+ expect="$2"
+ shift 2
R=$(git describe "$@" 2>err.actual)
S=$?
cat err.actual >&3
- test_expect_success "describe $*" '
+ test_expect_success $pcre "describe $*" '
test $S = 0 &&
case "$R" in
$expect) echo happy ;;
@@ -28,6 +29,14 @@ check_describe () {
'
}
+check_describe() {
+ _check_describe "" $*
+}
+
+check_describe_pcre() {
+ _check_describe LIBPCRE $*
+}
+
test_expect_success setup '
test_tick &&
@@ -175,12 +184,24 @@ test_expect_success 'set-up matching pattern tests' '
'
check_describe "test-annotated-*" --match="test-*"
+check_describe_pcre "test-annotated-*" --pcre-match="^test-"
+check_describe_pcre "test-annotated-*" --match="test-*" --pcre-match="^test-"
check_describe "test1-lightweight-*" --tags --match="test1-*"
+check_describe_pcre "test1-lightweight-*" --tags --pcre-match="^test1-"
+check_describe_pcre "test1-lightweight-*" --tags --match="test1-*" \
+ --pcre-match="^test1-"
check_describe "test2-lightweight-*" --tags --match="test2-*"
+check_describe_pcre "test2-lightweight-*" --tags --pcre-match="^test2-"
+check_describe_pcre "test2-lightweight-*" --tags --match="test2-*" \
+ --pcre-match="^test2-"
check_describe "test2-lightweight-*" --long --tags --match="test2-*" HEAD^
+check_describe_pcre "test2-lightweight-*" --long --tags \
+ --pcre-match="^test2-" HEAD^
+check_describe_pcre "test2-lightweight-*" --long --tags --match="test2-*" \
+ --pcre-match="^test2-" HEAD^
test_expect_success 'name-rev with exact tags' '
echo A >expect &&
--
2.5.0
--
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