shithub: git9

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git/query: make it possible query all history

Git/query now accepts the zero hash, 000000....00000,
as a parameter for git/query, and treats it as the
commit before the first commit. This means that

	git/query 000000000000..HEAD

is an easy way of getting all commits in history.

--- a/ref.c

+++ b/ref.c

@@ -35,6 +35,10 @@

 	int	color;

 };

+static Object zcommit = {

+	.type=GCommit

+};

+

 void

 eatspace(Eval *ev)

 {

@@ -52,7 +56,7 @@

 	assert(a->type == GCommit && b->type == GCommit);

 	if(a->commit->mtime == b->commit->mtime)

 		return 0;

-	else if(a->commit->mtime < b->commit->mtime)

+	else if(a->commit->mtime > b->commit->mtime)

 		return -1;

 	else

 		return 1;

@@ -415,7 +419,7 @@

 		idx = erealloc(idx, (nall + 1)*sizeof(int));

 		all[nall] = p;

 		idx[nall] = 0;

-		if(p == a)

+		if(p == a || p->commit->nparent == 0 && a == &zcommit)

 			if((nall = unwind(ev, all, idx, nall, &p, &keep, 1)) == -1)

 				break;

 		else if(p->commit->nparent == 0)

@@ -431,6 +435,8 @@

 			break;

 		if((p = readobject(p->commit->parent[idx[nall]])) == nil)

 			sysfatal("bad commit %H", p->commit->parent[idx[nall]]);

+		if(p->type != GCommit)

+			sysfatal("not commit: %H", p->hash);

 		nall++;

 	}

 	free(all);

@@ -494,7 +500,10 @@

 	if(readref(&h, name) == -1){

 		werrstr("invalid ref %s", name);

 		return -1;

-	}else if((o = readobject(h)) == nil){

+	}

+	if(hasheq(&h, &Zhash))

+		o = &zcommit;

+	else if((o = readobject(h)) == nil){

 		werrstr("invalid ref %s (hash %H)", name, h);

 		return -1;

 	}