read-tree: migrate to parse-options

Cleanup the documentation to explicitly state that --exclude-directory
is only meaningful when used with -u. Also make the documentation more
consistent with the usage message printed with read-tree --help-all.

The -m, --prefix, --reset options are performing similar actions
(setting some flags, read_cache_unmerged(), checking for illegal option
combinations). Instead of performing these actions when the options are
parsed, we delay performing them until after parse-opts has finished.

The bit fields in struct unpack_trees_options have been promoted to full
unsigned ints. This is necessary to avoid "foo ? 1 : 0" constructs to
set these fields.

Signed-off-by: Stephen Boyd <bebarino@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-read-tree.txt b/Documentation/git-read-tree.txt
index 7160fa1536e3af2edbdfb6d1049f2145bf2b4f50..4a932b08c6ed4f1de46d51fd92046d5190f831a7 100644 (file)
--- a/Documentation/git-read-tree.txt
+++ b/Documentation/git-read-tree.txt
@@ -8,7 +8,10 @@ git-read-tree - Reads tree information into the index
 
 SYNOPSIS
 --------
-'git read-tree' (<tree-ish> | [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>] [-u | -i]] [--exclude-per-directory=<gitignore>] [--index-output=<file>] <tree-ish1> [<tree-ish2> [<tree-ish3>]])
+'git read-tree' [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>]
+               [-u [--exclude-per-directory=<gitignore>] | -i]]
+               [--index-output=<file>]
+               <tree-ish1> [<tree-ish2> [<tree-ish3>]]
 
 
 DESCRIPTION

diff --git a/builtin-read-tree.c b/builtin-read-tree.c
index 17c96310ab66987dd02ef118d8f43d8d45923d01..9c2d634d6d04c3ce08e1352adcba31b527fc08b1 100644 (file)
--- a/builtin-read-tree.c
+++ b/builtin-read-tree.c
@@ -12,6 +12,7 @@
 #include "unpack-trees.h"
 #include "dir.h"
 #include "builtin.h"
+#include "parse-options.h"
 
 static int nr_trees;
 static struct tree *trees[MAX_UNPACK_TREES];
@@ -29,7 +30,39 @@ static int list_tree(unsigned char *sha1)
        return 0;
 }
 
-static const char read_tree_usage[] = "git read-tree (<sha> | [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>] [-u | -i]] [--exclude-per-directory=<gitignore>] [--index-output=<file>] <sha1> [<sha2> [<sha3>]])";
+static const char * const read_tree_usage[] = {
+       "git read-tree [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>] [-u [--exclude-per-directory=<gitignore>] | -i]]  [--index-output=<file>] <tree-ish1> [<tree-ish2> [<tree-ish3>]]",
+       NULL
+};
+
+static int index_output_cb(const struct option *opt, const char *arg,
+                                int unset)
+{
+       set_alternate_index_output(arg);
+       return 0;
+}
+
+static int exclude_per_directory_cb(const struct option *opt, const char *arg,
+                                   int unset)
+{
+       struct dir_struct *dir;
+       struct unpack_trees_options *opts;
+
+       opts = (struct unpack_trees_options *)opt->value;
+
+       if (opts->dir)
+               die("more than one --exclude-per-directory given.");
+
+       dir = xcalloc(1, sizeof(*opts->dir));
+       dir->flags |= DIR_SHOW_IGNORED;
+       dir->exclude_per_dir = arg;
+       opts->dir = dir;
+       /* We do not need to nor want to do read-directory
+        * here; we are merely interested in reusing the
+        * per directory ignore stack mechanism.
+        */
+       return 0;
+}
 
 static struct lock_file lock_file;
 
@@ -39,6 +72,34 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
        unsigned char sha1[20];
        struct tree_desc t[MAX_UNPACK_TREES];
        struct unpack_trees_options opts;
+       int prefix_set = 0;
+       const struct option read_tree_options[] = {
+               { OPTION_CALLBACK, 0, "index-output", NULL, "FILE",
+                 "write resulting index to <FILE>",
+                 PARSE_OPT_NONEG, index_output_cb },
+               OPT__VERBOSE(&opts.verbose_update),
+               OPT_GROUP("Merging"),
+               OPT_SET_INT('m', NULL, &opts.merge,
+                           "perform a merge in addition to a read", 1),
+               OPT_SET_INT(0, "trivial", &opts.trivial_merges_only,
+                           "3-way merge if no file level merging required", 1),
+               OPT_SET_INT(0, "aggressive", &opts.aggressive,
+                           "3-way merge in presence of adds and removes", 1),
+               OPT_SET_INT(0, "reset", &opts.reset,
+                           "same as -m, but discard unmerged entries", 1),
+               { OPTION_STRING, 0, "prefix", &opts.prefix, "<subdirectory>/",
+                 "read the tree into the index under <subdirectory>/",
+                 PARSE_OPT_NONEG | PARSE_OPT_LITERAL_ARGHELP },
+               OPT_SET_INT('u', NULL, &opts.update,
+                           "update working tree with merge result", 1),
+               { OPTION_CALLBACK, 0, "exclude-per-directory", &opts,
+                 "gitignore",
+                 "allow explicitly ignored files to be overwritten",
+                 PARSE_OPT_NONEG, exclude_per_directory_cb },
+               OPT_SET_INT('i', NULL, &opts.index_only,
+                           "don't check the working tree after merging", 1),
+               OPT_END()
+       };
 
        memset(&opts, 0, sizeof(opts));
        opts.head_idx = -1;
@@ -49,104 +110,19 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
 
        newfd = hold_locked_index(&lock_file, 1);
 
-       for (i = 1; i < argc; i++) {
-               const char *arg = argv[i];
-
-               /* "-u" means "update", meaning that a merge will update
-                * the working tree.
-                */
-               if (!strcmp(arg, "-u")) {
-                       opts.update = 1;
-                       continue;
-               }
-
-               if (!strcmp(arg, "-v")) {
-                       opts.verbose_update = 1;
-                       continue;
-               }
-
-               /* "-i" means "index only", meaning that a merge will
-                * not even look at the working tree.
-                */
-               if (!strcmp(arg, "-i")) {
-                       opts.index_only = 1;
-                       continue;
-               }
-
-               if (!prefixcmp(arg, "--index-output=")) {
-                       set_alternate_index_output(arg + 15);
-                       continue;
-               }
-
-               /* "--prefix=<subdirectory>/" means keep the current index
-                *  entries and put the entries from the tree under the
-                * given subdirectory.
-                */
-               if (!prefixcmp(arg, "--prefix=")) {
-                       if (stage || opts.merge || opts.prefix)
-                               usage(read_tree_usage);
-                       opts.prefix = arg + 9;
-                       opts.merge = 1;
-                       stage = 1;
-                       if (read_cache_unmerged())
-                               die("you need to resolve your current index first");
-                       continue;
-               }
-
-               /* This differs from "-m" in that we'll silently ignore
-                * unmerged entries and overwrite working tree files that
-                * correspond to them.
-                */
-               if (!strcmp(arg, "--reset")) {
-                       if (stage || opts.merge || opts.prefix)
-                               usage(read_tree_usage);
-                       opts.reset = 1;
-                       opts.merge = 1;
-                       stage = 1;
-                       read_cache_unmerged();
-                       continue;
-               }
-
-               if (!strcmp(arg, "--trivial")) {
-                       opts.trivial_merges_only = 1;
-                       continue;
-               }
-
-               if (!strcmp(arg, "--aggressive")) {
-                       opts.aggressive = 1;
-                       continue;
-               }
+       argc = parse_options(argc, argv, unused_prefix, read_tree_options,
+                            read_tree_usage, 0);
 
-               /* "-m" stands for "merge", meaning we start in stage 1 */
-               if (!strcmp(arg, "-m")) {
-                       if (stage || opts.merge || opts.prefix)
-                               usage(read_tree_usage);
-                       if (read_cache_unmerged())
-                               die("you need to resolve your current index first");
-                       stage = 1;
-                       opts.merge = 1;
-                       continue;
-               }
+       if (read_cache_unmerged() && (opts.prefix || opts.merge))
+               die("You need to resolve your current index first");
 
-               if (!prefixcmp(arg, "--exclude-per-directory=")) {
-                       struct dir_struct *dir;
-
-                       if (opts.dir)
-                               die("more than one --exclude-per-directory are given.");
-
-                       dir = xcalloc(1, sizeof(*opts.dir));
-                       dir->flags |= DIR_SHOW_IGNORED;
-                       dir->exclude_per_dir = arg + 24;
-                       opts.dir = dir;
-                       /* We do not need to nor want to do read-directory
-                        * here; we are merely interested in reusing the
-                        * per directory ignore stack mechanism.
-                        */
-                       continue;
-               }
+       prefix_set = opts.prefix ? 1 : 0;
+       if (1 < opts.merge + opts.reset + prefix_set)
+               die("Which one? -m, --reset, or --prefix?");
+       stage = opts.merge = (opts.reset || opts.merge || prefix_set);
 
-               if (1 < opts.index_only + opts.update)
-                       die("-u and -i at the same time makes no sense");
+       for (i = 0; i < argc; i++) {
+               const char *arg = argv[i];
 
                if (get_sha1(arg, sha1))
                        die("Not a valid object name %s", arg);
@@ -154,6 +130,8 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
                        die("failed to unpack tree object %s", arg);
                stage++;
        }
+       if (1 < opts.index_only + opts.update)
+               die("-u and -i at the same time makes no sense");
        if ((opts.update||opts.index_only) && !opts.merge)
                die("%s is meaningless without -m, --reset, or --prefix",
                    opts.update ? "-u" : "-i");

diff --git a/unpack-trees.h b/unpack-trees.h
index 1e0e2325f150e943dd22b16c1392c136570732bc..d19df44f4070ca1bda29382e56fbced53aacd994 100644 (file)
--- a/unpack-trees.h
+++ b/unpack-trees.h
@@ -17,18 +17,18 @@ struct unpack_trees_error_msgs {
 };
 
 struct unpack_trees_options {
-       unsigned int reset:1,
-                    merge:1,
-                    update:1,
-                    index_only:1,
-                    nontrivial_merge:1,
-                    trivial_merges_only:1,
-                    verbose_update:1,
-                    aggressive:1,
-                    skip_unmerged:1,
-                    initial_checkout:1,
-                    diff_index_cached:1,
-                    gently:1;
+       unsigned int reset,
+                    merge,
+                    update,
+                    index_only,
+                    nontrivial_merge,
+                    trivial_merges_only,
+                    verbose_update,
+                    aggressive,
+                    skip_unmerged,
+                    initial_checkout,
+                    diff_index_cached,
+                    gently;
        const char *prefix;
        int pos;
        struct dir_struct *dir;