From a22baf4ba2ab78dfe0c5bbd74c9f6fef5aa35f5d Mon Sep 17 00:00:00 2001
From: iamcheeseman <[hidden email]>
Date: Sun, 1 Mar 2026 12:18:17 -0500
Subject: Allow changing values at runtime

---
 src/bardata.c | 15 +++++++++++----
 src/tsar.c    | 34 +++++++++++++++++++++++-----------
 src/tsar.h    |  6 ++++++
 3 files changed, 40 insertions(+), 15 deletions(-)
 create mode 100644 src/tsar.h

(limited to 'src')

diff --git a/src/bardata.c b/src/bardata.c
index 73b0cc2..6369aa3 100644
--- a/src/bardata.c
+++ b/src/bardata.c
@@ -6,6 +6,7 @@
 #include <string.h>
 
 #include "pipe.h"
+#include "tsar.h"
 
 int fontsize = 16;
 color_t default_fg, default_bg;
@@ -72,10 +73,16 @@ void set_layout(char argv[MAX_ARGS][MAX_ARG_LEN], int argc) {
 
 void set_var(char argv[MAX_ARGS][MAX_ARG_LEN], int argc) {
   char *var = argv[1];
-  if (strcmp(var, "height")) {
-    bar_height = atoi(argv[2]);
+  if (strcmp(var, "height") == 0) {
+    int new_bar_height = atoi(argv[2]);
+    if (new_bar_height <= 0) {
+      fprintf(stderr, "invalid bar height %d\n", new_bar_height);
+      return;
+    } 
+    bar_height = new_bar_height;
   }
-  if (strcmp(var, "fontsize")) {
-    fontsize = atoi(argv[2]);
+  if (strcmp(var, "font") == 0) {
+    // fontsize = atoi(argv[2]);
+    load_font(argv[2]);
   }
 }
diff --git a/src/tsar.c b/src/tsar.c
index 869d73c..a4a0025 100644
--- a/src/tsar.c
+++ b/src/tsar.c
@@ -9,15 +9,15 @@
 #include <X11/Xlib.h>
 
 #include "pipe.h"
+#include "bardata.h"
 
 Display* display;
 Window win;
 GC gc;
 
-XftFont* font;
+XftFont* font = NULL;
 XftColor fg_color;
 
-static int height = 17;
 static int width = 1000;
 static float width_ratio = 1;
 
@@ -34,7 +34,17 @@ void die(const char* fmt, ...) {
   exit(err_code);
 }
 
-void draw_bar(void) {
+void load_font(const char* font_name) {
+  XftFont* new_font = XftFontOpenName(display, DefaultScreen(display), font_name);
+  if (new_font == NULL) {
+    fprintf(stderr, "cannot open font %s\n", font_name);
+    return;
+  }
+
+  if (font != NULL) {
+    XftFontClose(display, font);
+  }
+  font = new_font;
 }
 
 void init_x(void) {
@@ -56,7 +66,7 @@ void init_x(void) {
     display,
     DefaultRootWindow(display),
     0, 0,
-    width, height,
+    width, bar_height,
     0,
     CopyFromParent,
     InputOutput,
@@ -67,11 +77,7 @@ void init_x(void) {
 
   XMapRaised(display, win);
 
-  gc = XCreateGC(display, win, 0, NULL);
-  XSetForeground(display, gc, 0xFFFFFF);
-
-  const char font_name[] = "CommitMono:style=Regular:antialias=true";
-  font = XftFontOpenName(display, DefaultScreen(display), font_name);
+  load_font("monospace:size=10");
 
   XftColorAllocName(
     display,
@@ -81,6 +87,9 @@ void init_x(void) {
     &fg_color
   );
 
+  gc = XCreateGC(display, win, 0, NULL);
+  XSetForeground(display, gc, 0xFFFFFF);
+
   XFlush(display);
 }
 
@@ -98,7 +107,7 @@ void draw_text(const char* text, int x, int y) {
     DefaultColormap(display, DefaultScreen(display))
   );
 
-  int dy = y + (height - font->height) / 2 + font->ascent;
+  int dy = y + (bar_height - font->height) / 2 + font->ascent;
   XftDrawString8(xft_draw, &fg_color, font, x, dy, (const FcChar8*)text, strlen(text));
 
   XftDrawDestroy(xft_draw);
@@ -110,10 +119,13 @@ int main(void) {
 
   while (true) {
     XEvent ev;
-    XNextEvent(display, &ev);
+    while (XPending(display))
+      XNextEvent(display, &ev);
 
     XClearWindow(display, win);
 
+    XResizeWindow(display, win, width, bar_height);
+
     draw_text("Hello, world!", 0, 0);
 
     XFlush(display);
diff --git a/src/tsar.h b/src/tsar.h
new file mode 100644
index 0000000..1c9e60b
--- /dev/null
+++ b/src/tsar.h
@@ -0,0 +1,6 @@
+#ifndef TSAR_H
+#define TSAR_H
+
+void load_font(const char* font_name);
+
+#endif
-- 
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