[dev] [st] toggle font

[stanio]

Hi,

This patch (against tip) introduces an array of font names in the config
instead FONT and allows to cycle through them with Ctrl-PgUp at runtime.

I missed this feature a lot when light conditions and distance to
display change, often so with a notebook, even more when different
displays plugged. Of course, tmux helps -- kill, start new st, attach to
the right session --, but I like this approach more.

Someone might find it useful.

cheers,
--s_

diff -r ba208156a8af config.def.h
--- a/config.def.h      Tue Oct 09 19:40:37 2012 +0200
+++ b/config.def.h      Tue Oct 09 22:33:55 2012 +0200
@@ -1,5 +1,9 @@
 
-#define FONT "Liberation Mono:pixelsize=12:antialias=false:autohint=false"
+static char* fonts[] = {
+       "Liberation Mono:pixelsize=12:antialias=false:autohint=false",
+       "Liberation Mono:pixelsize=14:antialias=false:autohint=false",
+       "Liberation Mono:pixelsize=24:antialias=false:autohint=false"
+};
 
 /* Space in pixels around the terminal buffer */
 #define BORDER 2
diff -r ba208156a8af st.c
--- a/st.c      Tue Oct 09 19:40:37 2012 +0200
+++ b/st.c      Tue Oct 09 22:33:55 2012 +0200
@@ -73,6 +73,7 @@
 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
 
 #define VT102ID "\033[?6c"
+#define FONT   fonts[currfont]
 
 enum glyph_attribute {
        ATTR_NULL      = 0,
@@ -335,6 +336,8 @@
 static void selpaste(void);
 static void selscroll(int, int);
 
+static void togglefont(void);
+
 static int utf8decode(char *, long *);
 static int utf8encode(long *, char *);
 static int utf8size(char *);
@@ -378,6 +381,7 @@
 static char *opt_embed = NULL;
 static char *opt_class = NULL;
 static char *opt_font = NULL;
+static unsigned int currfont = 0;
 
 void *
 xmalloc(size_t len) {
@@ -2566,6 +2570,20 @@
 }
 
 void
+togglefont(){
+       int col, row;
+
+       currfont = (++currfont) % LEN(fonts);
+       initfonts(FONT);
+       col = (xw.w - 2*BORDER) / xw.cw;
+       row = (xw.h - 2*BORDER) / xw.ch;
+       tresize(col, row);
+       xresize(col, row);
+       ttyresize();
+       draw();
+}
+
+void
 kpress(XEvent *ev) {
        XKeyEvent *e = &ev->xkey;
        KeySym ksym;
@@ -2574,11 +2592,13 @@
        int len;
        int meta;
        int shift;
+       int ctrl;
        Status status;
 
        if (IS_SET(MODE_KBDLOCK))
                return;
 
+       ctrl = e->state & ControlMask;
        meta = e->state & Mod1Mask;
        shift = e->state & ShiftMask;
        len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
@@ -2589,6 +2609,11 @@
        /* 2. hardcoded (overrides X lookup) */
        } else {
                switch(ksym) {
+               case XK_Prior:
+               case XK_Next:
+                       if(ctrl)
+                               togglefont();
+                       break;
                case XK_Up:
                case XK_Down:
                case XK_Left: