From 061085232ef35f956316812806875331f175acf7 Mon Sep 17 00:00:00 2001
From: Mitchell Riedstra <mitch@riedstra.dev>
Date: Tue, 19 Oct 2021 23:18:47 -0400
Subject: Small patch to allow environment variables to be changed on the fly
 when DWM is reloaded.

---
 dwm.c   |  6 ++++++
 util2.h | 24 ++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 util2.h

diff --git a/dwm.c b/dwm.c
index cb4113f..8bcd0d2 100644
--- a/dwm.c
+++ b/dwm.c
@@ -43,6 +43,7 @@
 
 #include "drw.h"
 #include "util.h"
+#include "util2.h"
 
 /* macros */
 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
@@ -2142,6 +2143,11 @@ main(int argc, char *argv[])
 	if (!(dpy = XOpenDisplay(NULL)))
 		die("dwm: cannot open display");
 	checkotherwm();
+
+	FILE *fh;
+	if ((fh = fopen(".env", "r")))
+		readEnv(fh);
+
 	setup();
 #ifdef __OpenBSD__
 	if (pledge("stdio rpath proc exec", NULL) == -1)
diff --git a/util2.h b/util2.h
new file mode 100644
index 0000000..ab25acf
--- /dev/null
+++ b/util2.h
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <err.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+int
+readEnv(FILE *fh)
+{
+	int ret;
+	char name[1024], value[8192];
+
+	while (1) {
+		if ((ret = fscanf(fh, "%1023[^=]=%8191[^\n]\n", &name, &value)) == EOF)
+			break;
+		else if (ret == 0)
+			break;
+
+		fprintf(stderr, "Setting: '%s' = '%s'\n", name, value);
+		setenv(name, value, 1);
+	}
+
+	return 0;
+}
-- 
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