Usage string fixes to make maintenance easier (only one instance
of a string to update not multiple copies).  I've spotted and
corrected inconsistent usage text in diff-tree while doing this.

Also diff-cache and read-tree usage text have been corrected to
match their up-to-date features.  Earlier, neither "--cached"
form of diff-cache nor "-m single-merge" form of read-tree were
described. 

Signed-off-by: Junio C Hamano <[EMAIL PROTECTED]>
---

 commit-tree.c |   14 ++++++--------
 diff-cache.c  |    6 ++++--
 diff-tree.c   |    6 ++++--
 read-tree.c   |   10 ++++++----
 4 files changed, 20 insertions(+), 16 deletions(-)


--- ../git.linus/commit-tree.c  2005-04-20 19:00:38.000000000 -0700
+++ ../git.junio/commit-tree.c  2005-04-20 11:41:45.000000000 -0700
@@ -268,15 +268,13 @@
 }
 
 /*
- * Having more than two parents may be strange, but hey, there's
- * no conceptual reason why the file format couldn't accept multi-way
- * merges. It might be the "union" of several packages, for example.
- *
- * I don't really expect that to happen, but this is here to make
- * it clear that _conceptually_ it's ok..
+ * Having more than two parents is not strange at all, and this is
+ * how multi-way merges are represented.
  */
 #define MAXPARENT (16)
 
+static char *commit_tree_usage = "commit-tree <sha1> [-p <sha1>]* < changelog";
+
 int main(int argc, char **argv)
 {
        int i, len;
@@ -296,14 +294,14 @@
        unsigned int size;
 
        if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
-               usage("commit-tree <sha1> [-p <sha1>]* < changelog");
+               usage(commit_tree_usage);
 
        check_valid(tree_sha1, "tree");
        for (i = 2; i < argc; i += 2) {
                char *a, *b;
                a = argv[i]; b = argv[i+1];
                if (!b || strcmp(a, "-p") || get_sha1_hex(b, 
parent_sha1[parents]))
-                       usage("commit-tree <sha1> [-p <sha1>]* < changelog");
+                       usage(commit_tree_usage);
                check_valid(parent_sha1[parents], "commit");
                parents++;
        }


--- ../git.linus/diff-cache.c   2005-04-20 19:00:38.000000000 -0700
+++ ../git.junio/diff-cache.c   2005-04-20 19:14:25.000000000 -0700
@@ -215,6 +215,8 @@
        return 0;
 }
 
+static char *diff_cache_usage = "diff-cache [-r] [-z] [--cached] <tree sha1>";
+
 int main(int argc, char **argv)
 {
        unsigned char tree_sha1[20];
@@ -238,11 +240,11 @@
                        cached_only = 1;
                        continue;
                }
-               usage("diff-cache [-r] [-z] <tree sha1>");
+               usage(diff_cache_usage);
        }
 
        if (argc != 2 || get_sha1_hex(argv[1], tree_sha1))
-               usage("diff-cache [-r] [-z] <tree sha1>");
+               usage(diff_cache_usage);
 
        tree = read_tree_with_tree_or_commit_sha1(tree_sha1, &size, 0);
        if (!tree)


--- ../git.linus/diff-tree.c    2005-04-20 19:00:38.000000000 -0700
+++ ../git.junio/diff-tree.c    2005-04-20 19:14:55.000000000 -0700
@@ -178,6 +178,8 @@
        return retval;
 }
 
+static char *diff_tree_usage = "diff-tree [-r] [-z] <tree sha1> <tree sha1>";
+
 int main(int argc, char **argv)
 {
        unsigned char old[20], new[20];
@@ -194,10 +196,10 @@
                        line_termination = '\0';
                        continue;
                }
-               usage("diff-tree [-r] [-z] <tree sha1> <tree sha1>");
+               usage(diff_tree_usage);
        }
 
        if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], 
new))
-               usage("diff-tree <tree sha1> <tree sha1>");
+               usage(diff_tree_usage);
        return diff_tree_sha1(old, new, "");
 }



--- ../git.linus/read-tree.c    2005-04-20 19:00:38.000000000 -0700
+++ ../git.junio/read-tree.c    2005-04-20 19:15:33.000000000 -0700
@@ -217,6 +217,8 @@
        }
 }
 
+static char *read_tree_usage = "read-tree (<sha> | -m <sha1> [<sha2> <sha3>])";
+
 int main(int argc, char **argv)
 {
        int i, newfd, merge;
@@ -236,20 +238,20 @@
                if (!strcmp(arg, "-m")) {
                        int i;
                        if (stage)
-                               usage("-m needs to come first");
+                               die("-m needs to come first");
                        read_cache();
                        for (i = 0; i < active_nr; i++) {
                                if (ce_stage(active_cache[i]))
-                                       usage("you need to resolve your current 
index first");
+                                       die("you need to resolve your current 
index first");
                        }
                        stage = 1;
                        merge = 1;
                        continue;
                }
                if (get_sha1_hex(arg, sha1) < 0)
-                       usage("read-tree [-m] <sha1>");
+                       usage(read_tree_usage);
                if (stage > 3)
-                       usage("can't merge more than two trees");
+                       usage(read_tree_usage);
                if (read_tree(sha1, "", 0) < 0)
                        die("failed to unpack tree object %s", arg);
                stage++;
 

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