string_list: add a new function, filter_string_list()

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 72205faeafcaf91bc75a1d79bd72eecd4e3a6edb..00528ddc389212f045a7718ba55a26d723927f06 100644 (file)
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -11,6 +11,7 @@
 #include "parse-options.h"
 #include "diff.h"
 #include "userdiff.h"
+#include "streaming.h"
 
 #define BATCH 1
 #define BATCH_CHECK 2
@@ -90,7 +91,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
        unsigned long size;
        struct object_context obj_context;
 
-       if (get_sha1_with_context(obj_name, sha1, &obj_context))
+       if (get_sha1_with_context(obj_name, 0, sha1, &obj_context))
                die("Not a valid object name %s", obj_name);
 
        buf = NULL;
@@ -127,6 +128,8 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
                        return cmd_ls_tree(2, ls_args, NULL);
                }
 
+               if (type == OBJ_BLOB)
+                       return stream_blob_to_fd(1, sha1, NULL, 0);
                buf = read_sha1_file(sha1, &type, &size);
                if (!buf)
                        die("Cannot read object %s", obj_name);
@@ -149,6 +152,28 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
                break;
 
        case 0:
+               if (type_from_string(exp_type) == OBJ_BLOB) {
+                       unsigned char blob_sha1[20];
+                       if (sha1_object_info(sha1, NULL) == OBJ_TAG) {
+                               enum object_type type;
+                               unsigned long size;
+                               char *buffer = read_sha1_file(sha1, &type, &size);
+                               if (memcmp(buffer, "object ", 7) ||
+                                   get_sha1_hex(buffer + 7, blob_sha1))
+                                       die("%s not a valid tag", sha1_to_hex(sha1));
+                               free(buffer);
+                       } else
+                               hashcpy(blob_sha1, sha1);
+
+                       if (sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
+                               return stream_blob_to_fd(1, blob_sha1, NULL, 0);
+                       /*
+                        * we attempted to dereference a tag to a blob
+                        * and failed; there may be new dereference
+                        * mechanisms this code is not aware of.
+                        * fall-back to the usual case.
+                        */
+               }
                buf = read_object_with_reference(sha1, exp_type, &size, NULL);
                break;
 
@@ -219,21 +244,15 @@ static int batch_objects(int print_contents)
 }
 
 static const char * const cat_file_usage[] = {
-       "git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>",
-       "git cat-file (--batch|--batch-check) < <list_of_objects>",
+       N_("git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>"),
+       N_("git cat-file (--batch|--batch-check) < <list_of_objects>"),
        NULL
 };
 
 static int git_cat_file_config(const char *var, const char *value, void *cb)
 {
-       switch (userdiff_config(var, value)) {
-       case 0:
-               break;
-       case -1:
+       if (userdiff_config(var, value) < 0)
                return -1;
-       default:
-               return 0;
-       }
 
        return git_default_config(var, value, cb);
 }
@@ -244,19 +263,19 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
        const char *exp_type = NULL, *obj_name = NULL;
 
        const struct option options[] = {
-               OPT_GROUP("<type> can be one of: blob, tree, commit, tag"),
-               OPT_SET_INT('t', NULL, &opt, "show object type", 't'),
-               OPT_SET_INT('s', NULL, &opt, "show object size", 's'),
+               OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
+               OPT_SET_INT('t', NULL, &opt, N_("show object type"), 't'),
+               OPT_SET_INT('s', NULL, &opt, N_("show object size"), 's'),
                OPT_SET_INT('e', NULL, &opt,
-                           "exit with zero when there's no error", 'e'),
-               OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
+                           N_("exit with zero when there's no error"), 'e'),
+               OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
                OPT_SET_INT(0, "textconv", &opt,
-                           "for blob objects, run textconv on object's content", 'c'),
+                           N_("for blob objects, run textconv on object's content"), 'c'),
                OPT_SET_INT(0, "batch", &batch,
-                           "show info and content of objects fed from the standard input",
+                           N_("show info and content of objects fed from the standard input"),
                            BATCH),
                OPT_SET_INT(0, "batch-check", &batch,
-                           "show info about objects fed from the standard input",
+                           N_("show info about objects fed from the standard input"),
                            BATCH_CHECK),
                OPT_END()
        };