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-rw-r--r--builtin/merge-file.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/builtin/merge-file.c b/builtin/merge-file.c
new file mode 100644
index 0000000..832c93d
--- /dev/null
+++ b/builtin/merge-file.c
@@ -0,0 +1,156 @@
+#include "builtin.h"
+#include "abspath.h"
+#include "hex.h"
+#include "object-name.h"
+#include "object-store.h"
+#include "config.h"
+#include "gettext.h"
+#include "setup.h"
+#include "xdiff/xdiff.h"
+#include "xdiff-interface.h"
+#include "parse-options.h"
+
+static const char *const merge_file_usage[] = {
+ N_("git merge-file [<options>] [-L <name1> [-L <orig> [-L <name2>]]] <file1> <orig-file> <file2>"),
+ NULL
+};
+
+static int label_cb(const struct option *opt, const char *arg, int unset)
+{
+ static int label_count = 0;
+ const char **names = (const char **)opt->value;
+
+ BUG_ON_OPT_NEG(unset);
+
+ if (label_count >= 3)
+ return error("too many labels on the command line");
+ names[label_count++] = arg;
+ return 0;
+}
+
+int cmd_merge_file(int argc, const char **argv, const char *prefix)
+{
+ const char *names[3] = { 0 };
+ mmfile_t mmfs[3] = { 0 };
+ mmbuffer_t result = { 0 };
+ xmparam_t xmp = { 0 };
+ int ret = 0, i = 0, to_stdout = 0, object_id = 0;
+ int quiet = 0;
+ struct option options[] = {
+ OPT_BOOL('p', "stdout", &to_stdout, N_("send results to standard output")),
+ OPT_BOOL(0, "object-id", &object_id, N_("use object IDs instead of filenames")),
+ OPT_SET_INT(0, "diff3", &xmp.style, N_("use a diff3 based merge"), XDL_MERGE_DIFF3),
+ OPT_SET_INT(0, "zdiff3", &xmp.style, N_("use a zealous diff3 based merge"),
+ XDL_MERGE_ZEALOUS_DIFF3),
+ OPT_SET_INT(0, "ours", &xmp.favor, N_("for conflicts, use our version"),
+ XDL_MERGE_FAVOR_OURS),
+ OPT_SET_INT(0, "theirs", &xmp.favor, N_("for conflicts, use their version"),
+ XDL_MERGE_FAVOR_THEIRS),
+ OPT_SET_INT(0, "union", &xmp.favor, N_("for conflicts, use a union version"),
+ XDL_MERGE_FAVOR_UNION),
+ OPT_INTEGER(0, "marker-size", &xmp.marker_size,
+ N_("for conflicts, use this marker size")),
+ OPT__QUIET(&quiet, N_("do not warn about conflicts")),
+ OPT_CALLBACK('L', NULL, names, N_("name"),
+ N_("set labels for file1/orig-file/file2"), &label_cb),
+ OPT_END(),
+ };
+
+ xmp.level = XDL_MERGE_ZEALOUS_ALNUM;
+ xmp.style = 0;
+ xmp.favor = 0;
+
+ if (startup_info->have_repository) {
+ /* Read the configuration file */
+ git_config(git_xmerge_config, NULL);
+ if (0 <= git_xmerge_style)
+ xmp.style = git_xmerge_style;
+ }
+
+ argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
+ if (argc != 3)
+ usage_with_options(merge_file_usage, options);
+ if (quiet) {
+ if (!freopen("/dev/null", "w", stderr))
+ return error_errno("failed to redirect stderr to /dev/null");
+ }
+
+ if (object_id)
+ setup_git_directory();
+
+ for (i = 0; i < 3; i++) {
+ char *fname;
+ struct object_id oid;
+ mmfile_t *mmf = mmfs + i;
+
+ if (!names[i])
+ names[i] = argv[i];
+
+ fname = prefix_filename(prefix, argv[i]);
+
+ if (object_id) {
+ if (repo_get_oid(the_repository, argv[i], &oid))
+ ret = error(_("object '%s' does not exist"),
+ argv[i]);
+ else if (!oideq(&oid, the_hash_algo->empty_blob))
+ read_mmblob(mmf, &oid);
+ else
+ read_mmfile(mmf, "/dev/null");
+ } else if (read_mmfile(mmf, fname)) {
+ ret = -1;
+ }
+ if (ret != -1 && (mmf->size > MAX_XDIFF_SIZE ||
+ buffer_is_binary(mmf->ptr, mmf->size))) {
+ ret = error("Cannot merge binary files: %s",
+ argv[i]);
+ }
+
+ free(fname);
+ if (ret)
+ goto cleanup;
+
+ }
+
+ xmp.ancestor = names[1];
+ xmp.file1 = names[0];
+ xmp.file2 = names[2];
+ ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result);
+
+ if (ret >= 0) {
+ if (object_id && !to_stdout) {
+ struct object_id oid;
+ if (result.size) {
+ if (write_object_file(result.ptr, result.size, OBJ_BLOB, &oid) < 0)
+ ret = error(_("Could not write object file"));
+ } else {
+ oidcpy(&oid, the_hash_algo->empty_blob);
+ }
+ if (ret >= 0)
+ printf("%s\n", oid_to_hex(&oid));
+ } else {
+ const char *filename = argv[0];
+ char *fpath = prefix_filename(prefix, argv[0]);
+ FILE *f = to_stdout ? stdout : fopen(fpath, "wb");
+
+ if (!f)
+ ret = error_errno("Could not open %s for writing",
+ filename);
+ else if (result.size &&
+ fwrite(result.ptr, result.size, 1, f) != 1)
+ ret = error_errno("Could not write to %s", filename);
+ else if (fclose(f))
+ ret = error_errno("Could not close %s", filename);
+ free(fpath);
+ }
+ free(result.ptr);
+ }
+
+ if (ret > 127)
+ ret = 127;
+
+cleanup:
+ for (i = 0; i < 3; i++)
+ free(mmfs[i].ptr);
+
+ return ret;
+}