From 000c7fbeea391188f53710880aab0c80958b2a62 Mon Sep 17 00:00:00 2001
From: Alex Kotov <kotovalexarian@gmail.com>
Date: Wed, 17 Nov 2021 03:02:06 +0500
Subject: [PATCH] Configure build

---
 .gitignore          |   5 +-
 Makefile            |  36 ++++++++------
 config.mk           |  23 ---------
 config/4-defvars.mk |  15 ++++++
 configure           | 118 ++++++++++++++++++++++++++++++++++++++++++++
 src/dwm.c           |  12 ++---
 6 files changed, 164 insertions(+), 45 deletions(-)
 delete mode 100644 config.mk
 create mode 100644 config/4-defvars.mk
 create mode 100755 configure

diff --git a/.gitignore b/.gitignore
index 3392289..0526db3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
-/config/active.mk
+/config/1-custom.mk
+/config/2-generated.mk
+/config/3-custom.mk
+/config/5-custom.mk
 /polytreewm
 /src/*.o
diff --git a/Makefile b/Makefile
index fb8ebb4..47c5a2a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,17 @@
 # PolytreeWM - tiling window manager
 # See LICENSE file for copyright and license details.
 
-include config.mk
+CONFIGMKS = \
+	config/1-custom.mk \
+	config/2-generated.mk \
+	config/3-custom.mk \
+	config/4-defvars.mk \
+	config/5-custom.mk
+
+include $(CONFIGMKS)
 
 VERSION = 6.2
 
-CPPFLAGS += -DVERSION=\"$(VERSION)\" -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L
-CFLAGS   += $(CPPFLAGS) -std=c99 -Os -pedantic -Wall -Wno-deprecated-declarations
-LDFLAGS  +=
-
 SRC = \
 	src/atoms.c \
 	src/drw.c \
@@ -57,23 +60,26 @@ polytreewm: ${OBJ}
 	${CC} -c $< -o $@ ${CFLAGS}
 
 dwm.o: ${DWM_SRC} ${DWM_HDR}
-${OBJ}: ${HDR}
+${OBJ}: ${CONFIGMKS} ${HDR}
 
 clean:
 	rm -f polytreewm ${OBJ}
 
+distclean: clean
+	rm -f config/2-generated.mk
+
 install: all
-	mkdir -p ${DESTDIR}${PREFIX}/bin
-	cp -f polytreewm ${DESTDIR}${PREFIX}/bin
-	chmod 755 ${DESTDIR}${PREFIX}/bin/polytreewm
+	mkdir -p ${DESTDIR}${BINDIR}
+	cp -f polytreewm ${DESTDIR}${BINDIR}
+	chmod 755 ${DESTDIR}${BINDIR}/polytreewm
 	
-	mkdir -p ${DESTDIR}${MANPREFIX}/man1
-	sed "s/VERSION/${VERSION}/g" < polytreewm.1 > ${DESTDIR}${MANPREFIX}/man1/polytreewm.1
-	chmod 644 ${DESTDIR}${MANPREFIX}/man1/polytreewm.1
+	mkdir -p ${DESTDIR}${MANDIR}/man1
+	sed "s/VERSION/${VERSION}/g" < polytreewm.1 > ${DESTDIR}${MANDIR}/man1/polytreewm.1
+	chmod 644 ${DESTDIR}${MANDIR}/man1/polytreewm.1
 
 uninstall:
 	rm -f \
-		${DESTDIR}${PREFIX}/bin/polytreewm \
-		${DESTDIR}${MANPREFIX}/man1/polytreewm.1
+		${DESTDIR}${BINDIR}/polytreewm \
+		${DESTDIR}${MANDIR}/man1/polytreewm.1
 
-.PHONY: all options clean install uninstall
+.PHONY: all options clean distclean install uninstall
diff --git a/config.mk b/config.mk
deleted file mode 100644
index fd410e7..0000000
--- a/config.mk
+++ /dev/null
@@ -1,23 +0,0 @@
-##########################
-# Compiler, linker, etc. #
-##########################
-
-CC = cc
-PKGCONFIG = pkg-config
-
-#########
-# Paths #
-#########
-
-PREFIX = /usr/local
-MANPREFIX = $(PREFIX)/share/man
-
-################
-# Dependencies #
-################
-
-PKGS = fontconfig freetype2 x11 x11-xcb xcb xcb-res xft xinerama
-
-CPPFLAGS = -DXINERAMA
-CFLAGS   = `$(PKGCONFIG) --cflags $(PKGS)`
-LDFLAGS  = `$(PKGCONFIG) --libs   $(PKGS)`
diff --git a/config/4-defvars.mk b/config/4-defvars.mk
new file mode 100644
index 0000000..3d1bcf1
--- /dev/null
+++ b/config/4-defvars.mk
@@ -0,0 +1,15 @@
+CC = cc
+PKGCONFIG = pkg-config
+
+PKGS += fontconfig freetype2 x11 x11-xcb xcb xcb-res xft
+
+ifeq (yes,$(ENABLE_XINERAMA))
+CPPFLAGS += -DENABLE_XINERAMA
+PKGS += xinerama
+endif
+
+CFLAGS  += `$(PKGCONFIG) --cflags $(PKGS)`
+LDFLAGS += `$(PKGCONFIG) --libs   $(PKGS)`
+
+CPPFLAGS += -DVERSION=\"$(VERSION)\" -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L
+CFLAGS   += $(CPPFLAGS) -std=c99 -Os -pedantic -Wall -Wno-deprecated-declarations
diff --git a/configure b/configure
new file mode 100755
index 0000000..084b746
--- /dev/null
+++ b/configure
@@ -0,0 +1,118 @@
+#!/bin/sh
+
+set -e
+
+help() {
+	cat <<HELP
+This script tries to be similar to autotools' \`configure', but is different.
+
+Usage: ./configure [OPTION]...
+
+Defaults for the options are specified in brackets.
+
+Configuration:
+  -h, --help              Display this help and exit
+
+Installation directories:
+  --prefix PREFIX         install architecture-independent files in PREFIX
+                          [/usr/local]
+  --exec-prefix EPREFIX   install architecture-dependent files in EPREFIX
+                          [PREFIX]
+
+By default, \`make install' will install all the files in
+\`/usr/local/bin', \`/usr/local/lib' etc. You can specify
+an installation prefix other than \`/usr/local' using \`--prefix',
+for instance \`--prefix \$HOME'.
+
+For better control, use the options below.
+
+File tuning of the installation directories:
+  --bindir DIR            user executables [EPREFIX/bin]
+  --datarootdir DIR       read-only arch.-independent data root [PREFIX/share]
+  --mandir DIR            man documentation [DATAROOTDIR/man]
+
+Optional Features:
+  --disable-xinerama      disable Xinerama
+HELP
+}
+
+prefix='/usr/local'
+eprefix=''
+bindir=''
+datarootdir=''
+mandir=''
+enable_xinerama='yes'
+
+while [ $# -gt 0 ]; do
+	case "$1" in
+		-h | -? | --help | -help | help)
+			help
+			exit
+			;;
+		--prefix)
+			shift
+			prefix="$1"
+			;;
+		--exec-prefix)
+			shift
+			eprefix="$1"
+			;;
+		--bindir)
+			shift
+			bindir="$1"
+			;;
+		--datarootdir)
+			shift
+			datarootdir="$1"
+			;;
+		--mandir)
+			shift
+			mandir="$1"
+			;;
+		--disable-xinerama)
+			enable_xinerama='no'
+			;;
+		*)
+			help
+			exit
+			;;
+	esac
+
+	shift
+done
+
+if [ "$eprefix" = '' ]; then
+	eprefix="$prefix"
+fi
+
+if [ "$bindir" = '' ]; then
+	bindir="$eprefix/bin"
+fi
+
+if [ "$datarootdir" = '' ]; then
+	datarootdir="$prefix/share"
+fi
+
+if [ "$mandir" = '' ]; then
+	mandir="$datarootdir/man"
+fi
+
+echo "PREFIX          = $prefix"
+echo "EPREFIX         = $eprefix"
+echo "BINDIR          = $bindir"
+echo "DATAROOTDIR     = $datarootdir"
+echo "MANDIR          = $mandir"
+echo "ENABLE_XINERAMA = $enable_xinerama"
+
+touch 'config/1-custom.mk'
+touch 'config/3-custom.mk'
+touch 'config/5-custom.mk'
+
+rm -f 'config/2-generated.mk'
+
+echo "PREFIX          = $prefix"          >> 'config/2-generated.mk'
+echo "EPREFIX         = $eprefix"         >> 'config/2-generated.mk'
+echo "BINDIR          = $bindir"          >> 'config/2-generated.mk'
+echo "DATAROOTDIR     = $datarootdir"     >> 'config/2-generated.mk'
+echo "MANDIR          = $mandir"          >> 'config/2-generated.mk'
+echo "ENABLE_XINERAMA = $enable_xinerama" >> 'config/2-generated.mk'
diff --git a/src/dwm.c b/src/dwm.c
index ed06a0b..5914811 100644
--- a/src/dwm.c
+++ b/src/dwm.c
@@ -34,9 +34,9 @@
 #include <X11/Xlib.h>
 #include <X11/Xproto.h>
 #include <X11/Xutil.h>
-#ifdef XINERAMA
+#ifdef ENABLE_XINERAMA
 #include <X11/extensions/Xinerama.h>
-#endif /* XINERAMA */
+#endif /* ENABLE_XINERAMA */
 #include <X11/Xft/Xft.h>
 #include <X11/Xlib-xcb.h>
 #include <xcb/res.h>
@@ -1007,7 +1007,7 @@ incnmaster(const Arg *arg)
 	arrange(selmon);
 }
 
-#ifdef XINERAMA
+#ifdef ENABLE_XINERAMA
 static int
 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
 {
@@ -1017,7 +1017,7 @@ isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
 			return 0;
 	return 1;
 }
-#endif /* XINERAMA */
+#endif /* ENABLE_XINERAMA */
 
 void
 killclient(const Arg *arg)
@@ -2047,7 +2047,7 @@ updategeom(void)
 {
 	int dirty = 0;
 
-#ifdef XINERAMA
+#ifdef ENABLE_XINERAMA
 	if (XineramaIsActive(dpy)) {
 		int i, j, n, nn;
 		Client *c;
@@ -2102,7 +2102,7 @@ updategeom(void)
 		}
 		free(unique);
 	} else
-#endif /* XINERAMA */
+#endif /* ENABLE_XINERAMA */
 	{ /* default monitor setup */
 		if (!mons)
 			mons = createmon();