cat-file: refactor --batch option parsing

We currently use an int to tell us whether --batch parsing
is on, and if so, whether we should print the full object
contents. Let's instead factor this into a struct, filled in
by callback, which will make further batch-related options
easy to add.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 70dd8c8a101e04a409d25b535a4968a7935ef81d..5254fe8956235b6572da71f93212b04af3a44588 100644 (file)
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -13,9 +13,6 @@
 #include "userdiff.h"
 #include "streaming.h"
 
-#define BATCH 1
-#define BATCH_CHECK 2
-
 static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 {
        unsigned char sha1[20];
@@ -142,7 +139,12 @@ static void print_object_or_die(int fd, const unsigned char *sha1,
        }
 }
 
-static int batch_one_object(const char *obj_name, int print_contents)
+struct batch_options {
+       int enabled;
+       int print_contents;
+};
+
+static int batch_one_object(const char *obj_name, struct batch_options *opt)
 {
        unsigned char sha1[20];
        enum object_type type = 0;
@@ -167,19 +169,19 @@ static int batch_one_object(const char *obj_name, int print_contents)
        printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
        fflush(stdout);
 
-       if (print_contents == BATCH) {
+       if (opt->print_contents) {
                print_object_or_die(1, sha1, type, size);
                write_or_die(1, "\n", 1);
        }
        return 0;
 }
 
-static int batch_objects(int print_contents)
+static int batch_objects(struct batch_options *opt)
 {
        struct strbuf buf = STRBUF_INIT;
 
        while (strbuf_getline(&buf, stdin, '\n') != EOF) {
-               int error = batch_one_object(buf.buf, print_contents);
+               int error = batch_one_object(buf.buf, opt);
                if (error)
                        return error;
        }
@@ -201,10 +203,28 @@ static int git_cat_file_config(const char *var, const char *value, void *cb)
        return git_default_config(var, value, cb);
 }
 
+static int batch_option_callback(const struct option *opt,
+                                const char *arg,
+                                int unset)
+{
+       struct batch_options *bo = opt->value;
+
+       if (unset) {
+               memset(bo, 0, sizeof(*bo));
+               return 0;
+       }
+
+       bo->enabled = 1;
+       bo->print_contents = !strcmp(opt->long_name, "batch");
+
+       return 0;
+}
+
 int cmd_cat_file(int argc, const char **argv, const char *prefix)
 {
-       int opt = 0, batch = 0;
+       int opt = 0;
        const char *exp_type = NULL, *obj_name = NULL;
+       struct batch_options batch = {0};
 
        const struct option options[] = {
                OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
@@ -215,12 +235,12 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
                OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
                OPT_SET_INT(0, "textconv", &opt,
                            N_("for blob objects, run textconv on object's content"), 'c'),
-               OPT_SET_INT(0, "batch", &batch,
-                           N_("show info and content of objects fed from the standard input"),
-                           BATCH),
-               OPT_SET_INT(0, "batch-check", &batch,
-                           N_("show info about objects fed from the standard input"),
-                           BATCH_CHECK),
+               { OPTION_CALLBACK, 0, "batch", &batch, NULL,
+                       N_("show info and content of objects fed from the standard input"),
+                       PARSE_OPT_NOARG, batch_option_callback },
+               { OPTION_CALLBACK, 0, "batch-check", &batch, NULL,
+                       N_("show info about objects fed from the standard input"),
+                       PARSE_OPT_NOARG, batch_option_callback },
                OPT_END()
        };
 
@@ -237,19 +257,19 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
                else
                        usage_with_options(cat_file_usage, options);
        }
-       if (!opt && !batch) {
+       if (!opt && !batch.enabled) {
                if (argc == 2) {
                        exp_type = argv[0];
                        obj_name = argv[1];
                } else
                        usage_with_options(cat_file_usage, options);
        }
-       if (batch && (opt || argc)) {
+       if (batch.enabled && (opt || argc)) {
                usage_with_options(cat_file_usage, options);
        }
 
-       if (batch)
-               return batch_objects(batch);
+       if (batch.enabled)
+               return batch_objects(&batch);
 
        return cat_one_file(opt, exp_type, obj_name);
 }