Adding dynamic cursor color patch ref. #10

README.md

@@ -15,6 +15,8 @@ Refer to [https://st.suckless.org/](https://st.suckless.org/) for details on the
 
 ### Changelog:
 
+2021-02-26 - Added the dynamic cursor color patch
+
 2021-02-15 - Added the alpha gradient patch
 
 2020-11-14 - Added the wide glyphs patch
@@ -80,6 +82,9 @@ Refer to [https://st.suckless.org/](https://st.suckless.org/) for details on the
    - [disable-fonts](https://st.suckless.org/patches/disable_bold_italic_fonts/)
       - this patch adds the option of disabling bold/italic/roman fonts globally
 
+   - [dynamic-cursor-color](https://st.suckless.org/patches/dynamic-cursor-color/)
+      - this patch makes the cursor color the inverse of the current cell color
+
    - [externalpipe](https://st.suckless.org/patches/externalpipe/)
       - this patch allows for eading and writing st's screen through a pipe, e.g. to pass info to dmenu
 

patches.def.h

@@ -79,6 +79,11 @@
  */
 #define DISABLE_ROMAN_FONTS_PATCH 0
 
+/* This patch makes the cursor color the inverse of the current cell color.
+ * https://st.suckless.org/patches/dynamic-cursor-color/
+ */
+#define DYNAMIC_CURSOR_COLOR_PATCH 0
+
 /* Reading and writing st's screen through a pipe, e.g. pass info to dmenu.
  * https://st.suckless.org/patches/externalpipe/
  */

x.c

@@ -1848,6 +1848,9 @@ xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
 #endif // LIGATURES_PATCH
 {
 	Color drawcol;
+	#if DYNAMIC_CURSOR_COLOR_PATCH
+	XRenderColor colbg;
+	#endif // DYNAMIC_CURSOR_COLOR_PATCH
 
 	/* remove the old cursor */
 	if (selected(ox, oy))
@@ -1887,10 +1890,27 @@ xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
 			g.fg = defaultfg;
 			g.bg = defaultrcs;
 		} else {
+			#if DYNAMIC_CURSOR_COLOR_PATCH
+			g.bg = g.fg;
+			g.fg = defaultbg;
+			#else
 			g.fg = defaultbg;
 			g.bg = defaultcs;
+			#endif // DYNAMIC_CURSOR_COLOR_PATCH
 		}
+
+		#if DYNAMIC_CURSOR_COLOR_PATCH
+		if (IS_TRUECOL(g.bg)) {
+			colbg.alpha = 0xffff;
+			colbg.red = TRUERED(g.bg);
+			colbg.green = TRUEGREEN(g.bg);
+			colbg.blue = TRUEBLUE(g.bg);
+			XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &drawcol);
+		} else
+			drawcol = dc.col[g.bg];
+		#else
 		drawcol = dc.col[g.bg];
+		#endif // DYNAMIC_CURSOR_COLOR_PATCH
 	}
 
 	/* draw the new one */