From dc7293dd15fd6982920324f172fa8a8cc5791da5 Mon Sep 17 00:00:00 2001
From: bakkeby <bakkeby@gmail.com>
Date: Thu, 11 Feb 2021 11:08:32 +0100
Subject: [PATCH] Adding rio-like draw-to-resize windows.

This was backported from instantWM and depends on an external tool
slop to be installed.

Contributed by jzbor.
---
 config.def.h |  2 ++
 dwm.c        | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)

diff --git a/config.def.h b/config.def.h
index 1c0b587..cc9e851 100644
--- a/config.def.h
+++ b/config.def.h
@@ -5,6 +5,7 @@ static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
+static const char slopstyle[]       = "-t 0 -c 0.92,0.85,0.69,0.3"; /* do NOT define -f (format) here */
 static const char *fonts[]          = { "monospace:size=10" };
 static const char dmenufont[]       = "monospace:size=10";
 static const char col_gray1[]       = "#222222";
@@ -94,6 +95,7 @@ static Key keys[] = {
 	TAGKEYS(                        XK_8,                      7)
 	TAGKEYS(                        XK_9,                      8)
 	{ MODKEY|ShiftMask,             XK_q,      quit,           {0} },
+	{ MODKEY,                       XK_s,      riodraw,        {0} },
 };
 
 /* button definitions */
diff --git a/dwm.c b/dwm.c
index 4465af1..dd85686 100644
--- a/dwm.c
+++ b/dwm.c
@@ -192,6 +192,7 @@ static void resize(Client *c, int x, int y, int w, int h, int interact);
 static void resizeclient(Client *c, int x, int y, int w, int h);
 static void resizemouse(const Arg *arg);
 static void restack(Monitor *m);
+static void riodraw(const Arg *arg);
 static void run(void);
 static void scan(void);
 static int sendevent(Client *c, Atom proto);
@@ -1369,6 +1370,82 @@ restack(Monitor *m)
 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 }
 
+/* drag out an area using slop and resize the selected window to it. */
+void
+riodraw(const Arg *arg)
+{
+	char str[100];
+	int i;
+	char strout[100];
+	int dimensions[4];
+	int width, height, x, y;
+	char tmpstring[30] = {0};
+	char slopcmd[100] = "slop -f x%xx%yx%wx%hx ";
+	int firstchar = 0;
+	int counter = 0;
+	Monitor *m;
+	Client *c;
+
+	if (!selmon->sel)
+		return;
+	strcat(slopcmd, slopstyle);
+	FILE *fp = popen(slopcmd, "r");
+
+	while (fgets(str, 100, fp) != NULL) {
+		strcat(strout, str);
+	}
+
+	pclose(fp);
+
+	if (strlen(strout) < 6) {
+		return;
+	}
+
+	for (i = 0; i < strlen(strout); i++){
+		if (!firstchar) {
+			if (strout[i] == 'x')
+				firstchar = 1;
+			continue;
+		}
+
+		if (strout[i] != 'x') {
+			tmpstring[strlen(tmpstring)] = strout[i];
+		} else {
+			dimensions[counter] = atoi(tmpstring);
+			counter++;
+			memset(tmpstring,0,strlen(tmpstring));
+		}
+	}
+
+	x = dimensions[0];
+	y = dimensions[1];
+	width = dimensions[2];
+	height = dimensions[3];
+
+	if (!selmon->sel)
+		return;
+
+	c = selmon->sel;
+
+	if (width > 50 && height > 50 && x > -40 && y > -40 && width < selmon->mw + 40 && height < selmon->mh + 40 &&
+			(abs(c->w - width) > 20 || abs(c->h - height) > 20 || abs(c->x - x) > 20 || abs(c->y - y) > 20)) {
+		if ((m = recttomon(x, y, width, height)) != selmon) {
+			sendmon(c, m);
+			unfocus(selmon->sel, 0);
+			selmon = m;
+			focus(NULL);
+		}
+
+		if (!c->isfloating)
+			togglefloating(NULL);
+		resizeclient(c, x, y, width - (c->bw * 2), height - (c->bw * 2));
+		arrange(selmon);
+	} else {
+		fprintf(stderr, "error %s", strout);
+	}
+	memset(tmpstring,0,strlen(tmpstring));
+}
+
 void
 run(void)
 {
-- 
2.19.1