1 files changed, 152 insertions, 0 deletions
diff --git a/configure b/configure
new file mode 100755
index 0000000..f10ef90
--- /dev/null
+++ b/configure
@@ -0,0 +1,152 @@
+#!/bin/sh
+# vim:ft=sh:ts=4:sw=4:noexpandtab
+set -e
+
+# Configured variables #####################################################
+# Described in following format:
+# name:initial value:type:if exported to makefile:if exported to C header
+# Where type can be just a string (in C in "") or plain. None implies plain.
+CNFS="CBUILD:::F:F
+CHOST:::F:F
+DEBUG:no::T:F
+CPREFIX:::T:F
+CCX:g++::T:F
+CFLAGS:::T:F
+LFLAGS:::T:F"
+############################################################################
+# TODO add options to fine tune installation directories
+
+print_help() {
+	echo "Usage: ./configure [OPTION]..."
+	echo "GEML configuration script. Execute this script to configure project"
+	echo "and prepare it for building."
+	echo
+	echo "  --help, -h              Give this help list"
+	echo "  --debug, -d             Enable development features."
+	echo "  --release, -r           Disable development features for project."
+	echo "  --dep-check             Force depencency check."
+	echo "  --build=CBUILD          System compiler prefix on which project is"
+	echo "                          built."
+	echo "  --host=CHOST            Compiler prefix for system program and"
+	echo "                          libraries will run on."
+	echo
+	echo "Environment variables:"
+	echo "  CPREFIX                 Compilation tools prefix."
+	echo "  CXX                     C++ compiler command."
+	echo "  CFLAGS                  C++ compiler flags."
+	echo "  LDFLAGS                 C++ Linker flags."
+}
+
+CONFIG_FILE=.config
+CONFIGURED_FILE=.configured # TODO
+
+# Backup variables from environment
+ENVVARS="CPREFIX CXX CFLAGS LDFLAGS"
+for E in $ENVVARS; do
+	eval "[ -n \"\${$E+y}\" ]" && eval "BACKUP_$E=\$$E"
+done
+
+# Load default configuration if variable not set from environment
+eval `echo "$CNFS" | sed -ne 's/^\([^:]*\):\([^:]*\).*$/\1=\2/p'`
+
+# Load existing configuration
+if [ -f "$CONFIG_FILE" ]; then
+	. ./"$CONFIG_FILE"
+fi
+
+# Functions used for arguments parsing. Handles both --*=* and --* * arguments.
+# First arguments is option name. Second is $1 and third $2
+set_options() {
+	if [[ "$2" == --*=* ]]; then
+		VAL="$(echo "$2" | sed 's/--[^=]*=//')"
+	else
+		VAL="$3"
+	fi
+}
+
+# Requested operation.
+# c - Configure, default configuration behavior
+# m - Prints output for Makefile
+# h - Prints C header file
+OP=c
+
+# Parse arguments
+while [ "$#" -gt 0 ]; do
+	case $1 in
+		-h|--help)
+			print_help
+			exit 0
+			;;
+		-d|--debug)
+			DEBUG=yes
+			;;
+		-r|--release)
+			DEBUG=no
+			;;
+		--op-makefile)
+			OP=m
+			;;
+		--op-h)
+			OP=h
+			;;
+		*)
+			echo Warning: Unknown option $1 1>&2
+			;;
+	esac
+	shift
+done
+
+# Recover from enviroment variables
+for E in $ENVVARS; do
+	eval "[ -n \"\${BACKUP_$E+y}\" ]" && eval "$E=\$BACKUP_$E"
+done
+
+# Basically save configuration to file
+configure() {
+	echo "# linux-lcd configuration file" > "$CONFIG_FILE"
+	echo "# Please do not edit this file directly." >> "$CONFIG_FILE"
+	echo "$CNFS" | while read L; do
+		NAME=`echo "$L" | grep -o -E '^[^:]*'`
+		eval "VALUE=\$$NAME"
+		echo "$NAME=$VALUE" >> "$CONFIG_FILE"
+	done
+	echo "Configuration written to \"$CONFIG_FILE\""
+}
+
+makefile() {
+	echo "$CNFS" | while read L; do
+		if [ `echo $L | awk -F ':' '{ print $4 }'` != "T" ]; then
+			continue
+		fi
+		NAME=`echo "$L" | grep -o -E '^[^:]*'`
+		eval "VALUE=\$$NAME"
+		echo "$NAME := $VALUE"
+	done
+}
+
+cheader() {
+	echo "$CNFS" | while read L; do
+		if [ `echo $L | awk -F ':' '{ print $5 }'` != "T" ]; then
+			continue
+		fi
+		NAME=`echo "$L" | grep -o -E '^[^:]*'`
+		eval "VALUE=\$$NAME"
+		if [ "`echo $L | awk -F ':' '{ print $3 }'`" = "string" ]; then
+			echo "#define $NAME \"$VALUE\""
+		else
+			echo "#define $NAME $VALUE"
+		fi
+	done
+}
+
+case $OP in
+	c)
+		configure
+		;;
+	m)
+		makefile
+		;;
+	h)
+		cheader
+		;;
+esac