Wide character support.

Thanks "Eon S. Jeon" <esjeon@hyunmu.am>!

1 files changed, 68 insertions, 16 deletions

diff --git a/st.c b/st.c
index 0fa0c86..96d45bf 100644
--- a/st.c
+++ b/st.c
@@ -27,6 +27,7 @@
 #include <X11/keysym.h>
 #include <X11/Xft/Xft.h>
 #include <fontconfig/fontconfig.h>
+#include <wchar.h>
 
 #include "arg.h"
 
@@ -96,6 +97,8 @@ enum glyph_attribute {
         ATTR_ITALIC    = 16,
         ATTR_BLINK     = 32,
         ATTR_WRAP      = 64,
+        ATTR_WIDE      = 128,
+        ATTR_WDUMMY    = 256,
 };
 
 enum cursor_movement {
@@ -165,7 +168,7 @@ typedef unsigned short ushort;
 
 typedef struct {
         char c[UTF_SIZ]; /* character code */
-        uchar mode;      /* attribute flags */
+        ushort mode;      /* attribute flags */
         ulong fg;        /* foreground  */
         ulong bg;        /* background  */
 } Glyph;
@@ -719,8 +722,13 @@ selsnap(int mode, int *x, int *y, int direction) {
                                 }
                         }
 
+                        if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
+                                *x += direction;
+                                continue;
+                        }
+
                         if(strchr(worddelimiters,
-                                        term.line[*y][*x + direction].c[0])) {
+                                        term.line[*y][*x+direction].c[0])) {
                                 break;
                         }
 
@@ -932,7 +940,7 @@ selcopy(void) {
                                 /* nothing */;
 
                         for(x = 0; gp <= last; x++, ++gp) {
-                                if(!selected(x, y))
+                                if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
                                         continue;
 
                                 size = utf8size(gp->c);
@@ -1533,6 +1541,16 @@ tsetchar(char *c, Glyph *attr, int x, int y) {
                 }
         }
 
+        if(term.line[y][x].mode & ATTR_WIDE) {
+                if(x+1 < term.col) {
+                        term.line[y][x+1].c[0] = ' ';
+                        term.line[y][x+1].mode &= ~ATTR_WDUMMY;
+                }
+        } else if(term.line[y][x].mode & ATTR_WDUMMY) {
+                term.line[y][x-1].c[0] = ' ';
+                term.line[y][x-1].mode &= ~ATTR_WIDE;
+        }
+
         term.dirty[y] = 1;
         term.line[y][x] = *attr;
         memcpy(term.line[y][x].c, c, UTF_SIZ);
@@ -2222,6 +2240,15 @@ void
 tputc(char *c, int len) {
         uchar ascii = *c;
         bool control = ascii < '\x20' || ascii == 0177;
+        long u8char;
+        int width;
+
+        if(len == 1) {
+                width = 1;
+        } else {
+                utf8decode(c, &u8char);
+                width = wcwidth(u8char);
+        }
 
         if(iofd != -1) {
                 if(xwrite(iofd, c, len) < 0) {
@@ -2469,9 +2496,20 @@ tputc(char *c, int len) {
                         (term.col - term.c.x - 1) * sizeof(Glyph));
         }
 
+        if(term.c.x+width > term.col)
+                tnewline(1);
+
         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
-        if(term.c.x+1 < term.col) {
-                tmoveto(term.c.x+1, term.c.y);
+
+        if(width == 2) {
+                term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
+                if(term.c.x+1 < term.col) {
+                        term.line[term.c.y][term.c.x+1].c[0] = '\0';
+                        term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
+                }
+        }
+        if(term.c.x+width < term.col) {
+                tmoveto(term.c.x+width, term.c.y);
         } else {
                 term.c.state |= CURSOR_WRAPNEXT;
         }
@@ -3173,7 +3211,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
                                 xp, winy + frc[i].font->ascent,
                                 (FcChar8 *)u8c, u8cblen);
 
-                xp += xw.cw;
+                xp += xw.cw * wcwidth(u8char);
         }
 
         /*
@@ -3193,18 +3231,27 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
 void
 xdrawcursor(void) {
         static int oldx = 0, oldy = 0;
-        int sl;
+        int sl, width, curx;
         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
 
         LIMIT(oldx, 0, term.col-1);
         LIMIT(oldy, 0, term.row-1);
 
+        curx = term.c.x;
+
+        /* adjust position if in dummy */
+        if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
+                oldx--;
+        if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
+                curx--;
+
         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
 
         /* remove the old cursor */
         sl = utf8size(term.line[oldy][oldx].c);
+        width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
-                        oldy, 1, sl);
+                        oldy, width, sl);
 
         /* draw the new one */
         if(!(IS_SET(MODE_HIDE))) {
@@ -3216,26 +3263,28 @@ xdrawcursor(void) {
                         }
 
                         sl = utf8size(g.c);
-                        xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
+                        width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
+                                ? 2 : 1;
+                        xdraws(g.c, g, term.c.x, term.c.y, width, sl);
                 } else {
                         XftDrawRect(xw.draw, &dc.col[defaultcs],
-                                        borderpx + term.c.x * xw.cw,
+                                        borderpx + curx * xw.cw,
                                         borderpx + term.c.y * xw.ch,
                                         xw.cw - 1, 1);
                         XftDrawRect(xw.draw, &dc.col[defaultcs],
-                                        borderpx + term.c.x * xw.cw,
+                                        borderpx + curx * xw.cw,
                                         borderpx + term.c.y * xw.ch,
                                         1, xw.ch - 1);
                         XftDrawRect(xw.draw, &dc.col[defaultcs],
-                                        borderpx + (term.c.x + 1) * xw.cw - 1,
+                                        borderpx + (curx + 1) * xw.cw - 1,
                                         borderpx + term.c.y * xw.ch,
                                         1, xw.ch - 1);
                         XftDrawRect(xw.draw, &dc.col[defaultcs],
-                                        borderpx + term.c.x * xw.cw,
+                                        borderpx + curx * xw.cw,
                                         borderpx + (term.c.y + 1) * xw.ch - 1,
                                         xw.cw, 1);
                 }
-                oldx = term.c.x, oldy = term.c.y;
+                oldx = curx, oldy = term.c.y;
         }
 }
 
@@ -3284,6 +3333,7 @@ drawregion(int x1, int y1, int x2, int y2) {
         Glyph base, new;
         char buf[DRAW_BUF_SIZ];
         bool ena_sel = sel.ob.x != -1;
+        long u8char;
 
         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
                 ena_sel = 0;
@@ -3301,6 +3351,8 @@ drawregion(int x1, int y1, int x2, int y2) {
                 ic = ib = ox = 0;
                 for(x = x1; x < x2; x++) {
                         new = term.line[y][x];
+                        if(new.mode == ATTR_WDUMMY)
+                                continue;
                         if(ena_sel && selected(x, y))
                                 new.mode ^= ATTR_REVERSE;
                         if(ib > 0 && (ATTRCMP(base, new)
@@ -3313,10 +3365,10 @@ drawregion(int x1, int y1, int x2, int y2) {
                                 base = new;
                         }
 
-                        sl = utf8size(new.c);
+                        sl = utf8decode(new.c, &u8char);
                         memcpy(buf+ib, new.c, sl);
                         ib += sl;
-                        ++ic;
+                        ic += (new.mode & ATTR_WIDE)? 2 : 1;
                 }
                 if(ib > 0)
                         xdraws(buf, base, ox, y, ic, ib);