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plan9: add undo/redo via command, allow two-char shorthands

--- a/orca.man

+++ b/orca.man

@@ -159,7 +159,11 @@

 .B Ctrl+k

 or with a

 .B $

-operator.

+operator. All commands except

+.I undo

+and

+.I redo

+have a shorthand equivalent to their first two characters.

 .PP

 Any command can start with

 .I ,

--- a/plan9.c

+++ b/plan9.c

@@ -438,12 +438,18 @@

 }

 static void

-command(char *s)

+nosnapshot(void)

 {

+}

+

+static void

+command(char *s, void (*snapshot)(void))

+{

 	char *a;

 	int x, y;

 	if (s[0] == ',') {

+		snapshot();

 		cur = ZP;

 		sel = Rect(0, 0, field.width, field.height);

 		s++;

@@ -450,6 +456,8 @@

 	}

 	if (s[0] == '|' || s[0] == '>' || s[0] == '<') {

+		if (s[0] != '>')

+			snapshot();

 		shellpipe(s);

 		return;

 	}

@@ -457,19 +465,21 @@

 	if ((a = strchr(s, ':')) != nil || (a = strchr(s, ' ')) != nil)

 		*a++ = 0;

-	if (strcmp(s, "play") == 0)

+	if (s[0] == 'p' && s[1] == 'l') /* play */

 		pause = false;

-	else if (strcmp(s, "stop") == 0)

+	else if (s[0] == 's' && s[1] == 't') /* stop */

 		pause = true;

-	else if (strcmp(s, "run") == 0)

+	else if (s[0] == 'r' && s[1] == 'u') /* run */

 		forward = true;

-	else if (strcmp(s, "copy") == 0)

+	else if (s[0] == 'c' && s[1] == 'o') /* copy */

 		selcopy();

-	else if (strcmp(s, "paste") == 0)

+	else if (s[0] == 'p' && s[1] == 'a') { /* paste */

+		snapshot();

 		selpaste();

-	else if (strcmp(s, "erase") == 0)

+	} else if (s[0] == 'e' && s[1] == 'r') { /* erase */

+		snapshot();

 		selset('.');

-	else if (strcmp(s, "print") == 0) {

+	} else if (s[0] == 'p' && s[1] == 'r') { /* print */

 		for (y = sel.min.y; y <= sel.max.y; y++) {

 			for (x = sel.min.x; x <= sel.max.x; x++)

 				putchar(field.buffer[x + y*field.width]);

@@ -479,24 +489,28 @@

 	} else if (a != nil) {

 		x = atoi(a);

-		if (strcmp(s, "bpm") == 0)

+		if (s[0] == 'b' && s[1] == 'p') /* bpm */

 			apm = bpm = MAX(1, x);

-		else if (strcmp(s, "apm") == 0)

+		else if (s[0] == 'a' && s[1] == 'p') /* apm */

 			apm = MAX(1, x);

-		else if (strcmp(s, "frame") == 0)

+		else if (s[0] == 'f' && s[1] == 'r') /* frame */

 			tick = MAX(0, x);

-		else if (strcmp(s, "skip") == 0)

+		else if (s[0] == 's' && s[1] == 'k') /* skip */

 			tick = MAX(0, tick+x);

-		else if (strcmp(s, "rewind") == 0)

+		else if (s[0] == 'r' && s[1] == 'e') /* rewind */

 			tick = MAX(0, tick-x);

-		else if (strcmp(s, "ip") == 0)

+		else if (s[0] == 'i' && s[1] == 'p') /* ip */

 			netdial(a, nil);

-		else if (strcmp(s, "udp") == 0)

+		else if (s[0] == 'u' && s[1] == 'd') /* udp */

 			netdial(nil, a);

-		else if (strcmp(s, "midi") == 0)

+		else if (s[0] == 'm' && s[1] == 'i') /* midi */

 			midiopen(a);

 		/* FIXME color, find, select, inject, write, time */

+	} else if (strcmp(s, "undo") == 0) {

+		undo();

+	} else if (strcmp(s, "redo") == 0) {

+		redo();

 	}

 }

@@ -527,7 +541,7 @@

 			Oevent_cmd_string *c = &e->cmd_string;

 			memmove(tmp, c->chars, c->count);

 			tmp[c->count] = 0;

-			command(tmp);

+			command(tmp, nosnapshot);

 		} else if (e->any.oevent_type = Oevent_type_udp_string) {

 			Oevent_udp_string *u = &e->udp_string;

 			if (udp >= 0)

@@ -969,13 +983,12 @@

 		if ((n = read(0, buf, sizeof(buf)-1)) <= 0)

 			break;

-		snapshot();

 		for (i = 0; i < n; i++) {

 			if (buf[i] == '\r' || buf[i] == '\n' || buf[i] == 0) {

 				buf[i] = 0;

 				while (buf[i+1] == '\n')

 					i++;

-				command(buf);

+				command(buf, snapshot);

 				n -= i;

 				memmove(buf, buf+i+1, n);

 				i = 0;

@@ -1462,9 +1475,8 @@

 				break;

 			case 0x0b: /* C-k */

 				tmp[0] = 0;

-				snapshot();

 				if (enter("command:", tmp, sizeof(tmp), nil, &kctl, nil) > 0)

-					command(tmp);

+					command(tmp, snapshot);

 				break;

 			case Kesc:

 				if (mode == Mslide || mode != Minsert)

@@ -1535,6 +1547,11 @@

 				break;

 			}

 		}

+

+		if (field.width != oldw)

+			w = field.width;

+		if (field.height != oldh)

+			h = field.height;

 		if (w != oldw || h != oldh) {

 			mbuf_reusable_ensure_size(&mscr, h, w);