Add pre-inst-env script.

* configure.ac: Add pre-inst-env as config file.

* pre-inst-env.in: New file.

* 2d/config.scm.in (%pkgdatadir): Use GUILE_2D_PKGDATADIR environment
  variable, if defined.

* README.org: Document pre-inst-env script.

* .gitignore: Ignore pre-inst-env.

5 files changed, 41 insertions, 5 deletions

diff --git a/.gitignore b/.gitignore
index 31270d7..dd561c8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,4 @@ Makefile.in
 /doc/guile-2d.html
 /doc/guile-2d.t2p
 /2d/config.scm
+/pre-inst-env
diff --git a/2d/config.scm.in b/2d/config.scm.in
index 725bcda..e62a2b1 100644
--- a/2d/config.scm.in
+++ b/2d/config.scm.in
@@ -24,4 +24,5 @@
 (define-module (2d config)
   #:export (%pkgdatadir))
 
-(define %pkgdatadir "@pkgdatadir@")
+(define %pkgdatadir
+  (or (getenv "GUILE_2D_PKGDATADIR") "@pkgdatadir@"))
diff --git a/README.org b/README.org
index c1a4245..4502cbc 100644
--- a/README.org
+++ b/README.org
@@ -286,12 +286,12 @@
      guile simple.scm
    #+END_SRC
 
-   To run an example using the modules in the source directory (useful
-   when developing):
+   To run an example without installing guile-2d (useful when
+   developing):
 
    #+BEGIN_SRC sh
      cd examples
-     guile -L .. simple.scm
+     ../pre-inst-env guile simple.scm
    #+END_SRC
 
    To quit an example:
@@ -300,7 +300,7 @@
 
 ** Using the Sandbox
    If you want to quickly create a guile-2d environment and start
-   experimenting, run the =sandbox= script.  It will import many
+   experimenting, run =./pre-inst-env sandbox=.  It will import many
    useful modules, start a REPL server, open a window, and start the
    game loop.  Simply connect to the REPL server and start hacking!
 
diff --git a/configure.ac b/configure.ac
index 01f74b7..e0cc30f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,6 +17,7 @@ fi
 
 AC_CONFIG_FILES([Makefile doc/Makefile examples/Makefile data/Makefile])
 AC_CONFIG_FILES([env], [chmod +x env])
+AC_CONFIG_FILES([pre-inst-env], [chmod +x pre-inst-env])
 
 PKG_CHECK_MODULES([SDL], [sdl <= 1.3 sdl >= 1.2])
 PKG_CHECK_MODULES([SDL_tff], [SDL_ttf >= 2.0])
diff --git a/pre-inst-env.in b/pre-inst-env.in
new file mode 100644
index 0000000..f614211
--- /dev/null
+++ b/pre-inst-env.in
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+# guile-2d
+# Copyright © 2014 David Thompson <dthompson2@worcester.edu>
+#
+# guile-2d 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.
+#
+# This program 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 this program.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+abs_top_srcdir="`cd "@abs_top_srcdir@" > /dev/null; pwd`"
+abs_top_builddir="`cd "@abs_top_builddir@" > /dev/null; pwd`"
+
+GUILE_LOAD_COMPILED_PATH="$abs_top_builddir${GUILE_LOAD_COMPILED_PATH:+:}$GUILE_LOAD_COMPILED_PATH"
+GUILE_LOAD_PATH="$abs_top_builddir:$abs_top_srcdir${GUILE_LOAD_PATH:+:}:$GUILE_LOAD_PATH"
+export GUILE_LOAD_COMPILED_PATH GUILE_LOAD_PATH
+
+PATH="$abs_top_builddir:$PATH"
+export PATH
+
+GUILE_2D_PKGDATADIR="$abs_top_builddir/data"
+export GUILE_2D_PKGDATADIR
+
+exec "$@"