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git/query: add -r flag to print commits in reverse

This is useful for git/rebase and git/export, which need to
apply/export commits in chronological order.

--- a/git.1.man

+++ b/git.1.man

@@ -169,7 +169,7 @@

 .PP

 .B git/query

 [

-.B -pc

+.B -pcr

 ]

 .I query

 .PP

@@ -444,7 +444,11 @@

 .B Git/query

 takes an expression describing a commit, or set of commits,

-and resolves it to a list of commits. With the

+and resolves it to a list of commits.

+The

+.I -r

+option reverses the order of the commit list.

+With the

 .I -p

 option, instead of printing the commit hashes, the full

 path to their

--- a/query.c

+++ b/query.c

@@ -7,6 +7,7 @@

 int fullpath;

 int changes;

+int reverse;

 char *path[128];

 int npath;

@@ -120,7 +121,7 @@

 void

 usage(void)

 {

-	fprint(2, "usage: %s [-pc] query\n", argv0);

+	fprint(2, "usage: %s [-pcr] query\n", argv0);

 	exits("usage");

 }

@@ -135,6 +136,7 @@

 	ARGBEGIN{

 	case 'p':	fullpath++;	break;

 	case 'c':	changes++;	break;

+	case 'r':	reverse ^= 1;	break;

 	default:	usage();	break;

 	}ARGEND;

@@ -163,7 +165,7 @@

 	}else{

 		p = (fullpath ? "/mnt/git/object/" : "");

 		for(j = 0; j < n; j++)

-			print("%s%H\n", p, h[j]);

+			print("%s%H\n", p, h[reverse ? n - 1 - j : j]);

 	}

 	exits(nil);

 }