[hackers] [st][PATCH] Set custom environment variables in config.h

[Subhaditya Nath]

>From 79e69338725563e1bdba32e856726e8fa5151e4c Mon Sep 17 00:00:00 2001
From: Subhaditya Nath <sn03.gene...@gmail.com>
Date: Thu, 1 Apr 2021 19:42:51 +0530
Subject: [PATCH] Set custom environment variables in config.h

This patch enables setting custom environment variables in config.h.
This patch changes config.def.h, and sets $EDITOR to /usr/bin/vim by
default. Beware.
---
 config.def.h | 11 +++++++++++
 x.c          | 17 +++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/config.def.h b/config.def.h
index 6f05dce..d0d8078 100644
--- a/config.def.h
+++ b/config.def.h
@@ -73,6 +73,17 @@ static unsigned int cursorthickness = 2;
  */
 static int bellvolume = 0;

+/*
+ * environment variables
+ * Name     (char) - Name of the variable
+ * Value    (char) - Value of the variable
+ * Override (int)  - If set to 0, any existing value won't be overwritten
+ */
+static Envvar envvars[] = {
+       /* Name,        Value,          Override */
+       { "EDITOR",     "/usr/bin/vim", 1 },
+};
+
 /* default TERM value */
 char *termname = "st-256color";

diff --git a/x.c b/x.c
index 8bf998e..b7e1f14 100644
--- a/x.c
+++ b/x.c
@@ -45,6 +45,12 @@ typedef struct {
        signed char appcursor; /* application cursor */
 } Key;

+typedef struct {
+       char *name;
+       char *val;
+       int override;
+} Envvar;
+
 /* X modifiers */
 #define XK_ANY_MOD    UINT_MAX
 #define XK_NO_MOD     0
@@ -185,6 +191,7 @@ static void mousesel(XEvent *, int);
 static void mousereport(XEvent *);
 static char *kmap(KeySym, uint);
 static int match(uint, uint);
+static void setenvvars(void);

 static void run(void);
 static void usage(void);
@@ -1877,6 +1884,15 @@ resize(XEvent *e)
        cresize(e->xconfigure.width, e->xconfigure.height);
 }

+void
+setenvvars(void)
+{
+       for (int index = 0; index < (sizeof envvars / sizeof envvars[0]); 
index++) {
+               Envvar *envvar = &envvars[index];
+               setenv(envvar->name, envvar->val, envvar->override);
+       }
+}
+
 void
 run(void)
 {
@@ -2059,6 +2075,7 @@ run:
        xinit(cols, rows);
        xsetenv();
        selinit();
+       setenvvars();
        run();

        return 0;
-- 
2.31.0