From d77f364af4d685a614545120d4fa28e9e3770c5e Mon Sep 17 00:00:00 2001
From: sewn <sewn@disroot.org>
Date: Wed, 7 Jun 2023 14:46:03 +0300
Subject: [PATCH] Pass selected text to a plumber program

---
 config.def.h |  7 +++++++
 st.c         | 11 ++++++++++-
 st.h         |  4 ++++
 x.c          | 28 ++++++++++++++++++++++++++++
 4 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/config.def.h b/config.def.h
index 91ab8ca..1f5b17a 100644
--- a/config.def.h
+++ b/config.def.h
@@ -170,6 +170,12 @@ static unsigned int defaultattr = 11;
  */
 static uint forcemousemod = ShiftMask;
 
+/* 
+ *  Default plumber program. The selected text will be passed as an argument.
+ *  No other arguments can be passed.
+ */
+static char plumber[] = "plumber";
+
 /*
  * Internal mouse shortcuts.
  * Beware that overloading Button1 will disable the selection.
@@ -181,6 +187,7 @@ static MouseShortcut mshortcuts[] = {
 	{ XK_ANY_MOD,           Button4, ttysend,        {.s = "\031"} },
 	{ ShiftMask,            Button5, ttysend,        {.s = "\033[6;2~"} },
 	{ XK_ANY_MOD,           Button5, ttysend,        {.s = "\005"} },
+	{ XK_NO_MOD,            Button3, plumb,          {.i = 0}, },
 };
 
 /* Internal keyboard shortcuts. */
diff --git a/st.c b/st.c
index 134e724..626efa3 100644
--- a/st.c
+++ b/st.c
@@ -225,7 +225,8 @@ static CSIEscape csiescseq;
 static STREscape strescseq;
 static int iofd = 1;
 static int cmdfd;
-static pid_t pid;
+
+pid_t pid;
 
 static const uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 static const uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
@@ -1054,6 +1055,14 @@ tswapscreen(void)
 	tfulldirt();
 }
 
+int
+chdir_by_pid(pid_t pid)
+{
+	char buf[32];
+	snprintf(buf, sizeof buf, "/proc/%ld/cwd", (long)pid);
+	return chdir(buf);
+}
+
 void
 tscrolldown(int orig, int n)
 {
diff --git a/st.h b/st.h
index fd3b0d8..cca6468 100644
--- a/st.h
+++ b/st.h
@@ -81,6 +81,8 @@ void die(const char *, ...);
 void redraw(void);
 void draw(void);
 
+int chdir_by_pid(pid_t pid);
+
 void printscreen(const Arg *);
 void printsel(const Arg *);
 void sendbreak(const Arg *);
@@ -124,3 +126,5 @@ extern unsigned int tabspaces;
 extern unsigned int defaultfg;
 extern unsigned int defaultbg;
 extern unsigned int defaultcs;
+
+extern pid_t pid;
diff --git a/x.c b/x.c
index aa09997..1cca84e 100644
--- a/x.c
+++ b/x.c
@@ -5,6 +5,7 @@
 #include <locale.h>
 #include <signal.h>
 #include <sys/select.h>
+#include <sys/wait.h>
 #include <time.h>
 #include <unistd.h>
 #include <libgen.h>
@@ -55,6 +56,7 @@ static void clipcopy(const Arg *);
 static void clippaste(const Arg *);
 static void numlock(const Arg *);
 static void selpaste(const Arg *);
+static void plumb(const Arg *);
 static void zoom(const Arg *);
 static void zoomabs(const Arg *);
 static void zoomreset(const Arg *);
@@ -292,6 +294,32 @@ numlock(const Arg *dummy)
 	win.mode ^= MODE_NUMLOCK;
 }
 
+void
+plumb(const Arg *dummy)
+{
+	switch(fork()) {
+	case -1: 
+			die("plumb failed: %s\n", strerror(errno));
+			break;
+	case 0:
+		switch(fork()) {
+			case -1: 
+				die("plumb failed: %s\n", strerror(errno));
+				_exit(1);
+				break;
+			case 0:
+				chdir_by_pid(pid);
+				execlp(plumber, plumber, xsel.primary, NULL);
+				_exit(127);
+				break;
+			default:
+				_exit(0);
+		}
+	default:
+		wait(NULL);
+	}
+}
+
 void
 zoom(const Arg *arg)
 {
-- 
2.40.1