Add doc subdirectory with Termux manpage/user documentation

Makefile.am

@@ -16,7 +16,7 @@
 # along with termux-tools.  If not, see
 # <https://www.gnu.org/licenses/>.
 
-SUBDIRS = scripts
+SUBDIRS = scripts doc
 
 # We have two variants of our motd message:
 #   1. motd.sh: is sourced and echo'es a motd message with something that looks

configure.ac

@@ -90,6 +90,6 @@ AC_SUBST(termux_android_home)
 AC_SUBST(termux_package_format)
 AC_SUBST(termux_package_manager)
 
-AC_CONFIG_FILES([Makefile scripts/Makefile])
+AC_CONFIG_FILES([Makefile scripts/Makefile doc/Makefile])
 
 AC_OUTPUT

doc/Makefile.am

@@ -0,0 +1,29 @@
+# Copyright (C) 2022 Termux
+
+# This file is part of termux-tools.
+
+# termux-tools is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# termux-tools is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with termux-tools.  If not, see
+# <https://www.gnu.org/licenses/>.
+
+man_MANS = termux.1
+
+termux.1.md: ${srcdir}/termux.1.md.in
+	@echo "Creating termux.1.md"
+	@sed -e "s%[@]TERMUX_PREFIX[@]%$(termux_prefix)%g" \
+	    -e "s%[@]TERMUX_HOME[@]%${termux_android_home}%g" \
+	${srcdir}/termux.1.md.in > termux.1.md
+
+termux.1: termux.1.md
+	@echo "Generating termux.1"
+	@pandoc --standalone --to man --output termux.1 termux.1.md

packages/termux-tools/build.sh

@@ -56,12 +56,6 @@ termux_step_make_install() {
 
 	ln -sfr $TERMUX_PREFIX/bin/termux-open $TERMUX_PREFIX/bin/xdg-open
 
-	mkdir -p $TERMUX_PREFIX/share/man/man1
-	sed -e "s|@TERMUX_PREFIX@|${TERMUX_PREFIX}|g" -e "s|@TERMUX_HOME@|${TERMUX_ANDROID_HOME}|g" \
-		$TERMUX_PKG_BUILDER_DIR/termux.1.md.in > $TERMUX_PKG_TMPDIR/termux.1.md
-	pandoc --standalone --to man --output $TERMUX_PREFIX/share/man/man1/termux.1 \
-		$TERMUX_PKG_TMPDIR/termux.1.md
-
 	mkdir -p $TERMUX_PREFIX/etc/termux
 	cp -r $TERMUX_PKG_BUILDER_DIR/mirrors $TERMUX_PREFIX/etc/termux/
 	cd $TERMUX_PREFIX