Implement italic font support.

TODO

@@ -4,7 +4,6 @@ vt emulation
 * implement BCE right
 * color definition in CSI
 	* implement CSI parsing
-* implement real italic
 * make the keypad keys really work
 	* kf0 .. kf44
 	* kend, kel, kent, kfnd, ked, kext

config.def.h

@@ -1,6 +1,8 @@
 
 #define FONT "-*-*-medium-r-*-*-*-120-75-75-*-60-*-*"
 #define BOLDFONT "-*-*-bold-r-*-*-*-120-75-75-*-60-*-*"
+/* If italic is not availbel, fall back to bold. */
+#define ITALICFONT "-*-*-medium-o-*-*-*-120-75-75-*-60-*-*," BOLDFONT
 
 /* Space in pixels around the terminal buffer */
 #define BORDER 2

st.c

@@ -76,6 +76,7 @@ enum glyph_attribute {
 	ATTR_UNDERLINE = 2,
 	ATTR_BOLD      = 4,
 	ATTR_GFX       = 8,
+	ATTR_ITALIC    = 16,
 };
 
 enum cursor_movement {
@@ -238,7 +239,7 @@ typedef struct {
 		short lbearing;
 		short rbearing;
 		XFontSet set;
-	} font, bfont;
+	} font, bfont, ifont;
 } DC;
 
 static void die(const char*, ...);
@@ -1122,8 +1123,8 @@ tsetattr(int *attr, int l) {
 		case 1:
 			term.c.attr.mode |= ATTR_BOLD;
 			break;
-		case 3: /* enter standout (highlight) mode TODO: make it italic */
-			term.c.attr.mode |= ATTR_REVERSE;
+		case 3: /* enter standout (highlight) */
+			term.c.attr.mode |= ATTR_ITALIC;
 			break;
 		case 4:
 			term.c.attr.mode |= ATTR_UNDERLINE;
@@ -1134,8 +1135,8 @@ tsetattr(int *attr, int l) {
 		case 22:
 			term.c.attr.mode &= ~ATTR_BOLD;
 			break;
-		case 23: /* leave standout (highlight) mode TODO: make it italic */
-			term.c.attr.mode &= ~ATTR_REVERSE;
+		case 23: /* leave standout (highlight) mode */
+			term.c.attr.mode &= ~ATTR_ITALIC;
 			break;
 		case 24:
 			term.c.attr.mode &= ~ATTR_UNDERLINE;
@@ -1886,14 +1887,20 @@ xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rb
 }
 
 void
-initfonts(char *fontstr, char *bfontstr) {
-	if((dc.font.set = xinitfont(fontstr)) == NULL ||
-	   (dc.bfont.set = xinitfont(bfontstr)) == NULL)
-		die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
+initfonts(char *fontstr, char *bfontstr, char *ifontstr) {
+	if((dc.font.set = xinitfont(fontstr)) == NULL)
+		die("Can't load font %s\n", fontstr);
+	if((dc.bfont.set = xinitfont(bfontstr)) == NULL)
+		die("Can't load bfont %s\n", bfontstr);
+	if((dc.ifont.set = xinitfont(ifontstr)) == NULL)
+		die("Can't load ifont %s\n", ifontstr);
+
 	xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
 	    &dc.font.lbearing, &dc.font.rbearing);
 	xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
 	    &dc.bfont.lbearing, &dc.bfont.rbearing);
+	xgetfontinfo(dc.ifont.set, &dc.ifont.ascent, &dc.ifont.descent,
+	    &dc.ifont.lbearing, &dc.ifont.rbearing);
 }
 
 void
@@ -1927,7 +1934,7 @@ xinit(void) {
 	}
 
 	/* font */
-	initfonts(FONT, BOLDFONT);
+	initfonts(FONT, BOLDFONT, ITALICFONT);
 
 	/* XXX: Assuming same size for bold font */
 	xw.cw = dc.font.rbearing - dc.font.lbearing;
@@ -2002,6 +2009,9 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
 		fontset = dc.bfont.set;
 	}
 
+	if(base.mode & ATTR_ITALIC)
+		fontset = dc.ifont.set;
+
 	XSetBackground(xw.dpy, dc.gc, dc.col[bg]);
 	XSetForeground(xw.dpy, dc.gc, dc.col[fg]);
 

st.info

@@ -83,15 +83,16 @@ st| simpleterm,
 	op=\E[39;49m,
 	pairs#64,
 	rc=\E8,
-	rs1=\Ec,
-	rs2=\E[4l\E>,
 	rev=\E[7m,
 	ri=\EM,
+	ritm=\E[23m,
 	rmacs=\E(B,
 	rmcup=\E[?1049l,
-	rmkx=\E>,
+#	rmkx=\E>,
 	rmso=\E[23m,
 	rmul=\E[m,
+	rs1=\Ec,
+	rs2=\E[4l\E>,
 	sc=\E7,
 	setab=\E[4%p1%dm,
 	setaf=\E[3%p1%dm,
@@ -99,9 +100,10 @@ st| simpleterm,
 	setf=\E[3%?%p1%{1}%=%t4%e%p1%{3}%=%t6%e%p1%{4}%=%t1%e%p1%{6}%=%t3%e%p1%d%;m,
 	sgr0=\E[0m,
 	sgr=%?%p9%t\E(0%e\E(B%;\E[0%?%p6%t;1%;%?%p2%t;4%;%?%p1%p3%|%t;7%;%?%p4%t;5%;%?%p7%t;8%;m,
+	sitm=\E[3m,
 	smacs=\E(0,
 	smcup=\E[?1049h,
-	smkx=\E=,
+#	smkx=\E=,
 	smso=\E[3m,
 	smul=\E[4m,
 	tbc=\E[3g,