Commit 8ba0ff69725251fa375520d9c69c8a053725c4b6
2013-06-25T15:39:44
rev-parse example
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diff --git a/examples/Makefile b/examples/Makefile
index 6288906..95e46f0 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -3,7 +3,7 @@
CC = gcc
CFLAGS = -g -I../include -I../src -Wall -Wextra -Wmissing-prototypes -Wno-missing-field-initializers
LFLAGS = -L../build -lgit2 -lz
-APPS = general showindex diff rev-list cat-file status log
+APPS = general showindex diff rev-list cat-file status log rev-parse
all: $(APPS)
diff --git a/examples/rev-parse.c b/examples/rev-parse.c
new file mode 100644
index 0000000..cdbb61e
--- /dev/null
+++ b/examples/rev-parse.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <git2.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void check(int error, const char *message, const char *arg)
+{
+ if (!error)
+ return;
+ if (arg)
+ fprintf(stderr, "%s %s (%d)\n", message, arg, error);
+ else
+ fprintf(stderr, "%s(%d)\n", message, error);
+ exit(1);
+}
+
+static void usage(const char *message, const char *arg)
+{
+ if (message && arg)
+ fprintf(stderr, "%s: %s\n", message, arg);
+ else if (message)
+ fprintf(stderr, "%s\n", message);
+ fprintf(stderr, "usage: rev-parse [ --option ] <args>...\n");
+ exit(1);
+}
+
+struct parse_state {
+ git_repository *repo;
+ const char *repodir;
+ int not;
+};
+
+static int parse_revision(struct parse_state *ps, const char *revstr)
+{
+ git_revspec rs;
+ char str[GIT_OID_HEXSZ + 1];
+
+ if (!ps->repo) {
+ if (!ps->repodir)
+ ps->repodir = ".";
+ check(git_repository_open_ext(&ps->repo, ps->repodir, 0, NULL),
+ "Could not open repository from", ps->repodir);
+ }
+
+ check(git_revparse(&rs, ps->repo, revstr), "Could not parse", revstr);
+
+ if ((rs.flags & GIT_REVPARSE_SINGLE) != 0) {
+ git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
+ printf("%s\n", str);
+ git_object_free(rs.from);
+ }
+ else if ((rs.flags & GIT_REVPARSE_RANGE) != 0) {
+ git_oid_tostr(str, sizeof(str), git_object_id(rs.to));
+ printf("%s\n", str);
+ git_object_free(rs.to);
+
+ if ((rs.flags & GIT_REVPARSE_MERGE_BASE) != 0) {
+ git_oid base;
+ check(git_merge_base(&base, ps->repo,
+ git_object_id(rs.from), git_object_id(rs.to)),
+ "Could not find merge base", revstr);
+
+ git_oid_tostr(str, sizeof(str), &base);
+ printf("%s\n", str);
+ }
+
+ git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
+ printf("^%s\n", str);
+ git_object_free(rs.from);
+ }
+ else {
+ check(0, "Invalid results from git_revparse", revstr);
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ int i;
+ char *a;
+ struct parse_state ps;
+
+ git_threads_init();
+
+ memset(&ps, 0, sizeof(ps));
+
+ for (i = 1; i < argc; ++i) {
+ a = argv[i];
+
+ if (a[0] != '-') {
+ if (parse_revision(&ps, a) != 0)
+ break;
+ } else if (!strcmp(a, "--not"))
+ ps.not = !ps.not;
+ else if (!strncmp(a, "--git-dir=", strlen("--git-dir=")))
+ ps.repodir = a + strlen("--git-dir=");
+ else
+ usage("Cannot handle argument", a);
+ }
+
+ git_repository_free(ps.repo);
+ git_threads_shutdown();
+
+ return 0;
+}