From 70012dbf2cb8eddddc4ec57ecba4508a9d9664a5 Mon Sep 17 00:00:00 2001
From: bakkeby <bakkeby@gmail.com>
Date: Sat, 14 Sep 2019 23:58:04 +0200
Subject: [PATCH] Adding selfrestart patch

---
 README.md           |  5 +++-
 config.def.h        |  3 ++
 patch/include.c     |  4 +++
 patch/include.h     |  4 +++
 patch/selfrestart.c | 68 +++++++++++++++++++++++++++++++++++++++++++++
 patch/selfrestart.h |  2 ++
 patches.h           |  5 ++++
 7 files changed, 90 insertions(+), 1 deletion(-)
 create mode 100644 patch/selfrestart.c
 create mode 100644 patch/selfrestart.h

diff --git a/README.md b/README.md
index eea52ab..22dbed4 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Refer to [https://dwm.suckless.org/](https://dwm.suckless.org/) for details on t
 
 ### Changelog:
 
-2019-09-14 - Added setborderpx patch
+2019-09-14 - Added setborderpx and selfrestart patches
 
 2019-09-13 - Added titlecolor and push patches
 
@@ -119,6 +119,9 @@ Refer to [https://dwm.suckless.org/](https://dwm.suckless.org/) for details on t
       - saves size and position of every floating window before it is forced into tiled mode
       - if the window is made floating again then the old dimensions will be restored
 
+   - [selfrestart](https://dwm.suckless.org/patches/selfrestart/)
+      - restart dwm without the unnecessary dependency of an external script
+
    - [setborderpx](https://dwm.suckless.org/patches/statuspadding/)
       - this patch allows border pixels to be changed during runtime
 
diff --git a/config.def.h b/config.def.h
index 82ca8ee..9803c9c 100644
--- a/config.def.h
+++ b/config.def.h
@@ -272,6 +272,9 @@ static Key keys[] = {
 	{ MODKEY,                       XK_z,          showhideclient,    {0} },
 	#endif // AWESOMEBAR_PATCH
 	{ MODKEY|ShiftMask,             XK_c,          killclient,        {0} },
+	#if SELFRESTART_PATCH
+	{ MODKEY|ShiftMask,             XK_r,          self_restart,      {0} },
+	#endif // SELFRESTART_PATCH
 	{ MODKEY|ShiftMask,             XK_q,          quit,              {0} },
 	{ MODKEY,                       XK_t,          setlayout,         {.v = &layouts[0]} },
 	{ MODKEY,                       XK_f,          setlayout,         {.v = &layouts[1]} },
diff --git a/patch/include.c b/patch/include.c
index 61ac167..8a76a60 100644
--- a/patch/include.c
+++ b/patch/include.c
@@ -48,6 +48,10 @@
 #include "rotatestack.c"
 #endif
 
+#if SELFRESTART_PATCH
+#include "selfrestart.c"
+#endif
+
 #if SETBORDERPX_PATCH
 #include "setborderpx.c"
 #endif
diff --git a/patch/include.h b/patch/include.h
index fb427cf..924ffff 100644
--- a/patch/include.h
+++ b/patch/include.h
@@ -44,6 +44,10 @@
 #include "rotatestack.h"
 #endif
 
+#if SELFRESTART_PATCH
+#include "selfrestart.h"
+#endif
+
 #if SETBORDERPX_PATCH
 #include "setborderpx.h"
 #endif
diff --git a/patch/selfrestart.c b/patch/selfrestart.c
new file mode 100644
index 0000000..4fa6527
--- /dev/null
+++ b/patch/selfrestart.c
@@ -0,0 +1,68 @@
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/**
+ * Magically finds the current's executable path
+ *
+ * I'm doing the do{}while(); trick because Linux (what I'm running) is not
+ * POSIX compilant and so lstat() cannot be trusted on /proc entries
+ *
+ * @return char* the path of the current executable
+ */
+char *get_dwm_path()
+{
+    struct stat s;
+    int r, length, rate = 42;
+    char *path = NULL;
+
+    if (lstat("/proc/self/exe", &s) == -1) {
+        perror("lstat:");
+        return NULL;
+    }
+
+    length = s.st_size + 1 - rate;
+
+    do
+    {
+        length+=rate;
+
+        free(path);
+        path = malloc(sizeof(char) * length);
+
+        if (path == NULL){
+            perror("malloc:");
+            return NULL;
+        }
+
+        r = readlink("/proc/self/exe", path, length);
+
+        if (r == -1){
+            perror("readlink:");
+            return NULL;
+        }
+    } while(r >= length);
+
+    path[r] = '\0';
+
+    return path;
+}
+
+/**
+ * self-restart
+ *
+ * Initially inspired by: Yu-Jie Lin
+ * https://sites.google.com/site/yjlnotes/notes/dwm
+ */
+void self_restart(const Arg *arg)
+{
+    char *const argv[] = {get_dwm_path(), NULL};
+
+    if (argv[0] == NULL) {
+        return;
+    }
+
+    execv(argv[0], argv);
+}
\ No newline at end of file
diff --git a/patch/selfrestart.h b/patch/selfrestart.h
new file mode 100644
index 0000000..4af2436
--- /dev/null
+++ b/patch/selfrestart.h
@@ -0,0 +1,2 @@
+char *get_dwm_path();
+void self_restart(const Arg *arg);
\ No newline at end of file
diff --git a/patches.h b/patches.h
index 562d033..4b12fdc 100644
--- a/patches.h
+++ b/patches.h
@@ -187,6 +187,11 @@
  */
 #define SAVEFLOATS_PATCH 0
 
+/* Allows restarting dwm without the dependency of an external script.
+ * https://dwm.suckless.org/patches/selfrestart/
+ */
+#define SELFRESTART_PATCH 0
+
 /* This patch allows border pixels to be changed during runtime.
  * https://dwm.suckless.org/patches/setborderpx/
  */