Add spawninfo patch

patches/spawninfo/README.md

@@ -0,0 +1,41 @@
+### Description
+
+This patch adds `spawninfo` function that is very similar to `spawn`, except it
+also passes some information about the focused client via stdin.
+
+The info is passed in this format:
+
+    PID
+    TITLE
+    APPID
+    TAGS
+    X,Y WIDTHxHEIGHT
+
+I use it for 2 things: grabbing a screenshot of a focused window and adjusting
+volume of audio produced by a focused window (so much simpler than having to
+open pulsemixer every time). If you want to have the same functionality, you
+need to put these scripts into your PATH and make them executable:
+
+[screenshotwin](/dwl/dwl-patches/raw/branch/main/patches/spawninfo/screenshotwin)
+for taking a screenshot (`grim` is required):
+
+```c
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_S,          spawninfo,      SHCMD("screenshotwin") },
+```
+
+[pamixerc](/dwl/dwl-patches/raw/branch/main/patches/spawninfo/pamixerc)
+for adjusting volume (`pactl` is required):
+
+```c
+	{ MODKEY,                    XKB_KEY_XF86AudioRaiseVolume,spawninfo,SHCMD("pamixerc -- -i 5") },
+	{ MODKEY,                    XKB_KEY_XF86AudioLowerVolume,spawninfo,SHCMD("pamixerc -- -d 5") },
+	{ MODKEY,                    XKB_KEY_XF86AudioMute, spawninfo,    SHCMD("pamixerc -- -t") },
+```
+
+### Download
+
+- [0.7](/dwl/dwl-patches/raw/branch/main/patches/spawninfo/spawninfo.patch)
+
+### Authors
+
+- [Nikita Ivanov](https://codeberg.org/nikitaivanov) ([GitHub](https://github.com/NikitaIvanovV))

patches/spawninfo/pamixerc

@@ -0,0 +1,134 @@
+#!/usr/bin/awk -f
+
+function get_parent(pid,   cmd, ppid, arr) {
+	cmd = sprintf("/proc/%d/stat", pid)
+	ppid = ""
+	if ((getline line < cmd) > 0) {
+		split(line, arr)
+		ppid = arr[4]
+	}
+	close(cmd)
+	return ppid
+}
+
+function proc_clients(line,   arr) {
+	if (match(line, /^Client #(.*)/, arr)) {
+		store_client()
+		client_index = arr[1]
+		return
+	}
+	else if (match(line, /^\s*application\.process\.id = "(.*)"/, arr)) {
+		process_id = arr[1]
+		return
+	}
+	else if (match(line, /^\s*application\.name = "(.*)"/, arr)) {
+		application_name = arr[1]
+		return
+	}
+}
+
+function store_client() {
+	if (client_index == "")
+		return
+
+	clients[client_index] = 1
+	clients[client_index, "pid"] = process_id
+	clients[client_index, "parent_pid"] = get_parent(process_id)
+	clients[client_index, "name"] = application_name
+	client_index = ""
+	process_id = ""
+}
+
+function proc_sink_inputs(line,   arr) {
+	if (match(line, /^Sink Input #(.*)/, arr)) {
+		apply_sink_input()
+		sink_index = arr[1]
+		return
+	}
+	else if (match(line, /^\s*application\.process\.id = "(.*)"/, arr)) {
+		process_id = arr[1]
+		return
+	}
+	else if (match(line, /^\s*Client: (.*)/, arr)) {
+		client_index = arr[1]
+		return
+	}
+	else if (match(line, /^\s*Mute: (.*)/, arr)) {
+		muted = (arr[1] == "yes")
+		return
+	}
+	else if (match(line, /^\s*Volume:.* ([0-9]+)%/, arr)) {
+		volume = strtonum(arr[1])
+		return
+	}
+}
+
+function apply_sink_input(   cmd, header, msg, inc) {
+	if (sink_index == "")
+		return
+
+	# Do stuff if PID matches
+	if (PID == clients[client_index, "pid"] || PID == clients[client_index, "parent_pid"]) {
+		switch (ACTION) {
+			case "-i":
+			case "-d":
+				inc = strtonum(ARG)
+				if (ACTION == "-i")
+					volume += inc
+				else
+					volume -= inc
+				volume = volume > 100 ? 100 : volume
+				volume = volume < 0   ? 0   : volume
+				cmd = sprintf("pactl set-sink-input-volume '%d' '%d'%", sink_index, volume)
+				system(cmd)
+                print cmd
+				break
+			case "-t":
+				muted = !muted
+				cmd = sprintf("pactl set-sink-input-mute '%d' '%s'", sink_index, muted ? "true" : "false")
+				system(cmd)
+				print cmd
+				break
+		}
+		# Display a "popup" with new volume
+		header = sprintf("Client Volume: %d%%%s", volume, muted ? " MUTED" : "")
+		msg = clients[client_index, "name"]
+		system(sprintf("notify-send -r 101 -u low -h 'int:value:%d' '%s' '%s'", volume, header, msg))
+	}
+
+	sink_index = ""
+}
+
+BEGIN {
+	# Get arguments
+	# ACTION: -d, -i or -t (like pamixer)
+	# ARG:    num arg for -d or -i
+	ACTION = ARGV[1]
+	ARG    = ARGV[2]
+	for (i = 1; i < ARGC; i++)
+		delete ARGV[i]
+
+	# Get client info
+	getline PID
+	getline TITLE     # Not used
+	getline APPID     # Not used
+	getline TAGS      # Not used
+	getline GEOMETRY  # Not used
+
+	if (PID == "")
+		exit 1
+
+	# Process PulseAudio clients list and store PIDs for each
+	cmd = "pactl list clients"
+	while ((cmd | getline line) > 0)
+		proc_clients(line)
+	close(cmd)
+	store_client()
+
+	# Process PulseAudio sink inputs list and run apply_sink_input() for each
+	cmd = "pactl list sink-inputs"
+	while ((cmd | getline line) > 0)
+		proc_sink_inputs(line)
+	close(cmd)
+	apply_sink_input()
+}

patches/spawninfo/screenshotwin

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# Get client info
+read -r PID
+read -r TITLE
+read -r APPID
+read -r TAGS
+read -r GEOMETRY
+
+[ -n "$GEOMETRY" ] || exit 1
+
+tempdir="/tmp/screenshots"
+mkdir -p "$tempdir"
+file="$(mktemp -p "$tempdir" "XXXXXX.png")"
+
+# Grab the screenshot! Very conviniently, GEOMETRY format matches the one
+# expected by grim
+grim -g "$GEOMETRY" "$file" || exit
+
+wl-copy -t image/png < "$file"
+notify-send -i "$file" "Screenshot taken!" "Image copied to clipboard and saved to $file"

patches/spawninfo/spawninfo.patch

@@ -0,0 +1,110 @@
+From 83b8dc03f5ea40f472e90d452671f8e55faf2c4c Mon Sep 17 00:00:00 2001
+From: Nikita Ivanov <nikita.vyach.ivanov@gmail.com>
+Date: Sun, 9 Feb 2025 23:27:48 +0100
+Subject: [PATCH] spawninfo: spawn but pass client info via stdin
+
+---
+ client.h | 12 ++++++++++++
+ dwl.c    | 42 ++++++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 54 insertions(+)
+
+diff --git a/client.h b/client.h
+index 42f225f..bc9cad2 100644
+--- a/client.h
++++ b/client.h
+@@ -131,6 +131,18 @@ client_get_appid(Client *c)
+ 	return c->surface.xdg->toplevel->app_id;
+ }
+ 
++static inline int
++client_get_pid(Client *c)
++{
++	pid_t pid;
++#ifdef XWAYLAND
++	if (client_is_x11(c))
++		return c->surface.xwayland->pid;
++#endif
++	wl_client_get_credentials(c->surface.xdg->client->client, &pid, NULL, NULL);
++	return pid;
++}
++
+ static inline void
+ client_get_clip(Client *c, struct wlr_box *clip)
+ {
+diff --git a/dwl.c b/dwl.c
+index def2562..859514c 100644
+--- a/dwl.c
++++ b/dwl.c
+@@ -141,6 +141,7 @@ typedef struct {
+ 	uint32_t tags;
+ 	int isfloating, isurgent, isfullscreen;
+ 	uint32_t resize; /* configure serial of a pending resize */
++	pid_t pid;
+ } Client;
+ 
+ typedef struct {
+@@ -334,6 +335,7 @@ static void setpsel(struct wl_listener *listener, void *data);
+ static void setsel(struct wl_listener *listener, void *data);
+ static void setup(void);
+ static void spawn(const Arg *arg);
++static void spawninfo(const Arg *arg);
+ static void startdrag(struct wl_listener *listener, void *data);
+ static void tag(const Arg *arg);
+ static void tagmon(const Arg *arg);
+@@ -466,6 +468,8 @@ applyrules(Client *c)
+ 	if (!(title = client_get_title(c)))
+ 		title = broken;
+ 
++	c->pid = client_get_pid(c);
++
+ 	for (r = rules; r < END(rules); r++) {
+ 		if ((!r->title || strstr(title, r->title))
+ 				&& (!r->id || strstr(appid, r->id))) {
+@@ -2658,6 +2662,44 @@ spawn(const Arg *arg)
+ 	}
+ }
+ 
++void
++spawninfo(const Arg *arg)
++{
++	int fd[2];
++	pid_t pid;
++	const char *title, *appid;
++	Client *c = focustop(selmon);
++
++	if (pipe(fd) == -1)
++		return;
++	if ((pid = fork()) == -1)
++		return;
++	if (pid == 0) {
++		dup2(fd[0], STDIN_FILENO);
++		close(fd[0]);
++		close(fd[1]);
++		dup2(STDERR_FILENO, STDOUT_FILENO);
++		setsid();
++		execvp(((char **)arg->v)[0], (char **)arg->v);
++		die("dwl: execvp %s failed:", ((char **)arg->v)[0]);
++	}
++
++	close(fd[0]);
++
++	if (c) {
++		if (!(title = client_get_title(c)))
++			title = "";
++		if (!(appid = client_get_appid(c)))
++			appid = "";
++		dprintf(fd[1], "%d\n%s\n%s\n%"PRIu32"\n%d,%d %dx%d\n", c->pid,
++				title, appid, c->tags,
++				c->geom.x + c->bw, c->geom.y + c->bw,
++				c->geom.width - 2 * c->bw, c->geom.height - 2 * c->bw);
++	}
++
++	close(fd[1]);
++}
++
+ void
+ startdrag(struct wl_listener *listener, void *data)
+ {
+-- 
+2.48.1
+