rewrite configure script

configure

@@ -1,41 +1,21 @@
-#! /bin/bash
+#! /usr/bin/env bash
 
-#
-#  Output variables
-#
-
-# Path parameters
+# Install prefix
 PREFIX="$HOME/.local"
 # Individual component selection
 BUILD_fxsdk=1
 BUILD_fxconv=1
 BUILD_fxg1a=1
 
-#
-#  Tool name checking
-#
-
-check()
-{
-	[[ $1 = "fxsdk"  ]] ||
-	[[ $1 = "fxconv" ]] ||
-	[[ $1 = "fxg1a"  ]]
-}
-
-#
-#  Usage
-#
-
-help()
-{
-	cat << EOF
+help() {
+  cat << EOF
 Configuration options for the fxSDK (fx9860g and fxcg50 development tools).
 
 Tool selection:
   <tool> may be one of the following:
-    "fxsdk"          Command-line options (you generally want this)
-    "fxconv"         Asset conversion for gint (or any 4-aligned-VRAM system)
-    "fxg1a"          G1A file wrapper, editor and analyzer
+    fxsdk            Project management (you generally want this)
+    fxconv           Asset conversion for standard and custom gint formats
+    fxg1a            G1A file wrapper, editor and analyzer
 
   --enable-<tool>    Build and install the selected tool [default]
   --disable-<tool>   Do not build or install the selected tool
@@ -46,65 +26,49 @@ Install folders:
 
   --prefix=<prefix>  Base install folder [default $HOME/.local]
 EOF
-	exit 0
+  exit 0
 }
 
-#
-#  Argument parsing
-#
-
+# Parse arguments
 for arg; do case "$arg" in
-	-h | -? | --help)
-		help;;
+  -h | -? | --help)
+    help;;
 
-	--prefix=*)
-		PREFIX=${arg#--prefix=};;
+  --prefix=*)
+    PREFIX=${arg#--prefix=};;
 
-	--enable-*)
-		tool="${arg#--enable-}"
-		if ! check $tool; then
-			echo "error: cannot enable $tool: unknown tool"
-			exit 1
-		fi
+  --enable-*)
+    tool="${arg#--enable-}"
+    if [[ ! ":fxsdk:fxg1a:fxconv:" =~ ":$tool:" ]]; then
+      echo "error: $arg: no such tool"
+      exit 1
+    fi
+    eval "BUILD_${tool}=1";;
 
-		eval "BUILD_${tool}=1";;
+  --disable-*)
+    tool="${arg#--disable-}"
+    if [[ ! ":fxsdk:fxg1a:fxconv:" =~ ":$tool:" ]]; then
+      echo "error: $arg: no such tool"
+      exit 1
+    fi
+    eval "BUILD_${tool}=0";;
 
-	--disable-*)
-		tool="${arg#--disable-}"
-		if ! check $tool; then
-			echo "error: cannot disable $tool: unknown tool"
-			exit 1
-		fi
-
-		eval "BUILD_${tool}=0";;
-
-	*)
-		echo "error: unrecognized option $arg"
-		exit 1;;
+  *)
+    echo "error: unrecognized option $arg"
+    exit 1;;
 esac; done
 
-#
-#  Makefile generation
-#
-
-gen()
-{
-	# Allow an install script to change the destination at the last second
-        # to have all files in a separate root before packaging
-	echo "PREFIX  ?= $PREFIX"
-	echo -n "TARGETS ="
-
-	[[ $BUILD_fxsdk  = 1 ]] && echo -n " fxsdk"
-	[[ $BUILD_fxconv = 1 ]] && echo -n " fxconv"
-	[[ $BUILD_fxg1a  = 1 ]] && echo -n " fxg1a"
-
-	echo ""
+# Generate sub-Makefile with configuration details
+gen() {
+  # Allow an install script to change the destination at the last second
+  # to have all files in a separate root before packaging
+  # TODO: Support DESTDIR instead
+  echo "PREFIX ?= $PREFIX"
+  echo -n "TARGETS ="
+  [[ $BUILD_fxsdk  = 1 ]] && echo -n " fxsdk"
+  [[ $BUILD_fxconv = 1 ]] && echo -n " fxconv"
+  [[ $BUILD_fxg1a  = 1 ]] && echo -n " fxg1a"
+  echo ""
 }
 
-echo "Configuration complete, the following has been saved in Makefile.cfg:"
-echo ""
-
-gen | tee Makefile.cfg
-
-echo ""
-echo "You can now 'make'."
+gen > Makefile.cfg