Adding font2 patch as per request #3

README.md

@@ -1,4 +1,4 @@
-Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.8.2 project has a different take on st patching. It uses preprocessor directives to decide whether or not to include a patch during build time. Essentially this means that this build, for better or worse, contains both the patched _and_ the original code. The aim being that you can select which patches to include and the build will contain that code and nothing more.
+Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.8.2 (ed68fe7dce2b21b4e0e595b99d47790e76812cb7) project has a different take on st patching. It uses preprocessor directives to decide whether or not to include a patch during build time. Essentially this means that this build, for better or worse, contains both the patched _and_ the original code. The aim being that you can select which patches to include and the build will contain that code and nothing more.
 
 For example to include the `alpha` patch then you would only need to flip this setting from 0 to 1 in [patches.h](https://github.com/bakkeby/st-flexipatch/blob/master/patches.h):
 ```c
@@ -15,6 +15,8 @@ Refer to [https://st.suckless.org/](https://st.suckless.org/) for details on the
 
 ### Changelog:
 
+2020-03-21 - Added font2 patch
+
 2020-01-07 - Added st embedder patch
 
 2019-10-16 - Introduced [flexipatch-finalizer](https://github.com/bakkeby/flexipatch-finalizer)
@@ -58,6 +60,9 @@ Refer to [https://st.suckless.org/](https://st.suckless.org/) for details on the
    - [fix-keyboard-input](https://st.suckless.org/patches/fix_keyboard_input/)
       - allows cli applications to use all the fancy key combinations that are available to GUI applications
 
+   - [font2](https://st.suckless.org/patches/font2/)
+      - allows you to add a spare font besides the default
+
    - [hidecursor](https://st.suckless.org/patches/hidecursor/)
       - hides the X cursor whenever a key is pressed and show it back when the mouse is moved in the terminal window
 

config.def.h

@@ -6,6 +6,14 @@
  * font: see http://freedesktop.org/software/fontconfig/fontconfig-user.html
  */
 static char *font = "Liberation Mono:pixelsize=12:antialias=true:autohint=true";
+#if FONT2_PATCH
+/* Spare fonts */
+static char *font2[] = {
+/*	"Inconsolata for Powerline:pixelsize=12:antialias=true:autohint=true", */
+/*	"Hack Nerd Font Mono:pixelsize=11:antialias=true:autohint=true", */
+};
+#endif // FONT2_PATCH
+
 #if RELATIVEBORDER_PATCH
 /* borderperc: percentage of cell width to use as a border
  *             0 = no border, 100 = border width is same as cell width */

patch/font2.c

@@ -0,0 +1,94 @@
+int
+xloadsparefont(FcPattern *pattern, int flags)
+{
+	FcPattern *match;
+	FcResult result;
+
+	match = FcFontMatch(NULL, pattern, &result);
+	if (!match) {
+		return 1;
+	}
+
+	if (!(frc[frclen].font = XftFontOpenPattern(xw.dpy, match))) {
+		FcPatternDestroy(match);
+		return 1;
+	}
+
+	frc[frclen].flags = flags;
+	/* Believe U+0000 glyph will present in each default font */
+	frc[frclen].unicodep = 0;
+	frclen++;
+
+	return 0;
+}
+
+void
+xloadsparefonts(void)
+{
+	FcPattern *pattern;
+	double sizeshift, fontval;
+	int fc;
+	char **fp;
+
+	if (frclen != 0)
+		die("can't embed spare fonts. cache isn't empty");
+
+	/* Calculate count of spare fonts */
+	fc = sizeof(font2) / sizeof(*font2);
+	if (fc == 0)
+		return;
+
+	/* Allocate memory for cache entries. */
+	if (frccap < 4 * fc) {
+		frccap += 4 * fc - frccap;
+		frc = xrealloc(frc, frccap * sizeof(Fontcache));
+	}
+
+	for (fp = font2; fp - font2 < fc; ++fp) {
+
+		if (**fp == '-')
+			pattern = XftXlfdParse(*fp, False, False);
+		else
+			pattern = FcNameParse((FcChar8 *)*fp);
+
+		if (!pattern)
+			die("can't open spare font %s\n", *fp);
+
+		if (defaultfontsize > 0) {
+			sizeshift = usedfontsize - defaultfontsize;
+			if (sizeshift != 0 &&
+					FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval) ==
+					FcResultMatch) {
+				fontval += sizeshift;
+				FcPatternDel(pattern, FC_PIXEL_SIZE);
+				FcPatternDel(pattern, FC_SIZE);
+				FcPatternAddDouble(pattern, FC_PIXEL_SIZE, fontval);
+			}
+		}
+
+		FcPatternAddBool(pattern, FC_SCALABLE, 1);
+
+		FcConfigSubstitute(NULL, pattern, FcMatchPattern);
+		XftDefaultSubstitute(xw.dpy, xw.scr, pattern);
+
+		if (xloadsparefont(pattern, FRC_NORMAL))
+			die("can't open spare font %s\n", *fp);
+
+		FcPatternDel(pattern, FC_SLANT);
+		FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
+		if (xloadsparefont(pattern, FRC_ITALIC))
+			die("can't open spare font %s\n", *fp);
+
+		FcPatternDel(pattern, FC_WEIGHT);
+		FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
+		if (xloadsparefont(pattern, FRC_ITALICBOLD))
+			die("can't open spare font %s\n", *fp);
+
+		FcPatternDel(pattern, FC_SLANT);
+		FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
+		if (xloadsparefont(pattern, FRC_BOLD))
+			die("can't open spare font %s\n", *fp);
+
+		FcPatternDestroy(pattern);
+	}
+}

patch/font2.h

@@ -0,0 +1,2 @@
+static int xloadsparefont(FcPattern *, int);
+static void xloadsparefonts(void);

patch/x_include.c

@@ -11,6 +11,9 @@
 #if FIXKEYBOARDINPUT_PATCH
 #include "fixkeyboardinput.c"
 #endif
+#if FONT2_PATCH
+#include "font2.c"
+#endif
 #if KEYBOARDSELECT_PATCH
 #include "keyboardselect_x.c"
 #endif

patch/x_include.h

@@ -8,6 +8,9 @@
 #if FIXIME_PATCH
 #include "fixime_x.h"
 #endif
+#if FONT2_PATCH
+#include "font2.h"
+#endif
 #if KEYBOARDSELECT_PATCH
 #include "keyboardselect_x.h"
 #endif

patches.def.h

@@ -79,6 +79,14 @@
  */
 #define FIXKEYBOARDINPUT_PATCH 0
 
+/* This patch allows you to add spare font besides the default. Some glyphs can be not present in
+ * the default font. For this glyphs st uses font-config and try to find them in font cache first.
+ * This patch append fonts defined in font2 variable to the beginning of the font cache.
+ * So they will be used first for glyphs that are absent in the default font.
+ * https://st.suckless.org/patches/font2/
+ */
+#define FONT2_PATCH 0
+
 /* Hide the X cursor whenever a key is pressed and show it back when the mouse is moved in
  * the terminal window.
  * https://st.suckless.org/patches/hidecursor/

st.c

@@ -2468,7 +2468,6 @@ tputc(Rune u)
 			goto check_control_code;
 		}
 
-
 		if (IS_SET(MODE_SIXEL)) {
 			/* TODO: implement sixel mode */
 			return;

x.c

@@ -254,8 +254,9 @@ typedef struct {
 } Fontcache;
 
 /* Fontcache is an array now. A new font will be appended to the array. */
-static Fontcache frc[16];
+static Fontcache *frc = NULL;
 static int frclen = 0;
+static int frccap = 0;
 static char *usedfont = NULL;
 static double usedfontsize = 0;
 static double defaultfontsize = 0;
@@ -331,6 +332,9 @@ zoomabs(const Arg *arg)
 {
 	xunloadfonts();
 	xloadfonts(usedfont, arg->f);
+	#if FONT2_PATCH
+	xloadsparefonts();
+	#endif // FONT2_PATCH
 	cresize(0, 0);
 	redraw();
 	xhints();
@@ -861,7 +865,6 @@ xsetcolorname(int x, const char *name)
 	if (!BETWEEN(x, 0, dc.collen))
 		return 1;
 
-
 	if (!xloadcolor(x, name, &ncolor))
 		return 1;
 
@@ -1163,6 +1166,11 @@ xinit(int cols, int rows)
 	usedfont = (opt_font == NULL)? font : opt_font;
 	xloadfonts(usedfont, 0);
 
+	#if FONT2_PATCH
+	/* spare fonts */
+	xloadsparefonts();
+	#endif // FONT2_PATCH
+
 	/* colors */
 	#if ALPHA_PATCH
 	xw.cmap = XCreateColormap(xw.dpy, parent, xw.vis, None);
@@ -1447,13 +1455,10 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
 			fontpattern = FcFontSetMatch(0, fcsets, 1,
 					fcpattern, &fcres);
 
-			/*
+			/* Allocate memory for the new cache entry. */
-			 * Overwrite or create the new cache entry.
+			if (frclen >= frccap) {
-			 */
+				frccap += 16;
-			if (frclen >= LEN(frc)) {
+				frc = xrealloc(frc, frccap * sizeof(Fontcache));
-				frclen = LEN(frc) - 1;
-				XftFontClose(xw.dpy, frc[frclen].font);
-				frc[frclen].unicodep = 0;
  			}
 
 			frc[frclen].font = XftFontOpenPattern(xw.dpy,