diff f03556a76343783be1873dc39d57b63e37c07dc1 uncommitted
--- /dev/null
+++ b//lib/ktrans/telex.map
@@ -1,0 +1,127 @@
+aw	ă
+aa	â
+dd	đ
+ee	ê
+oo	ô
+ow	ơ
+uw	ư
+Af	À
+af	à
+Ăf	Ằ
+ăf	ằ
+Âf	Ầ
+âf	ầ
+Ef	È
+ef	è
+Êf	Ề
+êf	ề
+If	Ì
+if	ì
+Of	Ò
+of	ò
+Ôf	Ồ
+ôf	ồ
+Ơf	Ờ
+ơf	ờ
+Uf	Ù
+uf	ù
+Ưf	Ừ
+ưf	ừ
+Yf	Ỳ
+yf	ỳ
+As	Á
+as	á
+Ăs	Ắ
+ăs	ắ
+Âs	Ấ
+âs	ấ
+Es	É
+es	é
+Ês	Ế
+ês	ế
+Is	Í
+is	í
+Os	Ó
+os	ó
+Ôs	Ố
+ôs	ố
+Ơs	Ớ
+ơs	ớ
+Us	Ú
+us	ú
+Ưs	Ứ
+ưs	ứ
+Ys	Ý
+ys	ý
+Ar	Ả
+ar	ả
+Ăr	Ẳ
+ăr	ẳ
+Âr	Ẩ
+âr	ẩ
+Er	Ẻ
+er	ẻ
+Êr	Ể
+êr	ể
+Ir	Ỉ
+ir	ỉ
+Or	Ỏ
+or	ỏ
+Ôr	Ổ
+ôr	ổ
+Ơr	Ở
+ơr	ở
+Ur	Ủ
+ur	ủ
+Ưr	Ử
+ưr	ử
+Yr	Ỷ
+yr	ỷ
+Ax	Ã
+ax	ã
+Ăx	Ẵ
+ăx	ẵ
+Âx	Ẫ
+âx	ẫ
+Ex	Ẽ
+ex	ẽ
+Êx	Ễ
+êx	ễ
+Ix	Ĩ
+ix	ĩ
+Ox	Õ
+ox	õ
+Ôx	Ỗ
+ôx	ỗ
+Ơx	Ỡ
+ơx	ỡ
+Ux	Ũ
+ux	ũ
+Ưx	Ữ
+ưx	ữ
+Yx	Ỹ
+yx	ỹ
+Aj	Ạ
+aj	ạ
+Ăj	Ặ
+ăj	ặ
+Âj	Ậ
+âj	ậ
+Ej	Ẹ
+ej	ẹ
+Êj	Ệ
+êj	ệ
+Ij	Ị
+ij	ị
+Oj	Ọ
+oj	ọ
+Ôj	Ộ
+ôj	ộ
+Ơj	Ợ
+ơj	ợ
+Uj	Ụ
+uj	ụ
+Ưj	Ự
+ưj	ự
+Yj	Ỵ
+yj	ỵ
--- a//sys/src/cmd/ktrans/main.c
+++ b//sys/src/cmd/ktrans/main.c
@@ -17,10 +17,7 @@
 #include "hash.h"
 #include "ktrans.h"
 
-static Hmap  *jisho, *zidian;
-static int   deflang;
 static char  backspace[64];
-
 mainstacksize = 8192*2;
 
 char*
@@ -59,6 +56,14 @@
 	return d;
 }
 
+char*
+peekstr(char *s, char *b)
+{
+	while(s > b && (*--s & 0xC0)==0x80)
+		;
+	return s;
+}
+
 typedef struct Str Str;
 struct Str {
 	char b[128];
@@ -83,9 +88,7 @@
 void
 popstr(Str *s)
 {
-	while(s->p > s->b && (*--s->p & 0xC0)==0x80)
-		;
-
+	s->p = peekstr(s->p, s->b);
 	s->p[0] = '\0';
 }
 
@@ -199,15 +202,26 @@
 	LangEL	= '',	// ^o
 	LangKO	= '',	// ^s
 	LangZH	= '',	// ^c
+	LangVN	= '',  // ^v
 };
 
+/* explicit mapping */
+Hmap  *jisho;
+Hmap  *zidian;
+
+/* implicit mapping */
 Hmap *natural;
 Hmap *hira, *kata;
 Hmap *cyril;
 Hmap *greek;
 Hmap *hangul;
+
+/* marker only */
 Hmap *hanzi;
+Hmap *telex;
 
+int   deflang;
+
 Hmap **langtab[] = {
 	[LangEN]  &natural,
 	[LangJP]  &hira,
@@ -216,6 +230,7 @@
 	[LangEL]  &greek,
 	[LangKO]  &hangul,
 	[LangZH]  &hanzi,
+	[LangVN]  &telex,
 };
 
 char *langcodetab[] = {
@@ -226,6 +241,7 @@
 	[LangEL]  "el",
 	[LangKO]  "ko",
 	[LangZH]  "zh",
+	[LangVN]  "vn",
 };
 
 int
@@ -434,6 +450,43 @@
 	send(t->done, nil);
 }
 
+int
+telexlkup(Str *line, Str *out)
+{
+	Map lkup;
+	char buf[UTFmax*3], *p, *e, *x;
+	int n;
+
+	p = pushutf(buf, buf+sizeof buf, line->b, 1);
+	n = p-buf;
+
+	if(hmapget(telex, buf, &lkup) < 0)
+		return -1;
+
+	assert(lkup.leadstomore == 1);
+	//All of our keys are 2 characters long, but we
+	//need to peek three in order to fully disambiguate.
+	if(utflen(line->b) < 3)
+		return 1;
+
+	x = peekstr(line->p, line->b);
+	e = peekstr(x, line->b);
+	pushutf(p, buf+sizeof buf, e, 1);
+	if(hmapget(telex, buf, &lkup) < 0)
+		return 1;
+
+	if(strcmp(x, e) == 0)
+		return -1;
+
+	out->p = pushutf(out->b, strend(out), lkup.kana, 0);
+	//fprint(2, "%s %s\n", line->b, line->b+n);
+	out->p = pushutf(out->p, strend(out), line->b+n, 0);
+	popstr(out);
+	popstr(out);
+	out->p = pushutf(out->p, strend(out), x, 1);
+	return 0;
+}
+
 void
 keyproc(void *a)
 {
@@ -445,7 +498,7 @@
 	int n;
 	Rune r;
 	char peek[UTFmax+1];
-	Str line;
+	Str line, tbuf;
 	int mode;
 
 	t = a;
@@ -475,6 +528,11 @@
 				resetstr(&line, nil);
 				continue;
 			}
+			if(lang == LangVN && utfrune(" \n", r) != nil){
+				resetstr(&line, nil);
+				if(r == '')
+					continue;
+			}
 			if(lang == LangZH || lang == LangJP){
 				emitutf(t->dict, p, 1);
 				if(utfrune("\n", r) != nil){
@@ -498,6 +556,21 @@
 			}
 
 			line.p = pushutf(line.p, strend(&line), p, 1);
+			if(lang == LangVN){
+				switch(telexlkup(&line, &tbuf)){
+				case -1:
+					resetstr(&line, nil);
+					continue;
+				case 1:
+					continue;
+				case 0:
+					emitutf(t->output, backspace, utflen(line.b));
+					emitutf(t->output, tbuf.b, 0);
+					//fprint(2, "tbuf: %s\n", tbuf.b);
+					resetstr(&line, nil);
+					continue;
+				}
+			}
 			if(maplkup(lang, line.b, &lkup) < 0){
 				resetstr(&line, nil);
 				pushutf(peek, peek + sizeof peek, p, 1);
@@ -581,6 +654,7 @@
 	greek 	= openmap("/lib/ktrans/greek.map");
 	cyril 	= openmap("/lib/ktrans/cyril.map");
 	hangul 	= openmap("/lib/ktrans/hangul.map");
+	telex	= openmap("/lib/ktrans/telex.map");
 
 	launchfs(srv, mntpt, kbd);
 }