octave.pkgs: init

Heavily based on Python's packages set.

pkgs/development/interpreters/octave/hooks/write-required-octave-packages-hook.sh

@@ -0,0 +1,17 @@
+# Setup hook for writing octave packages that are run-time dependencies for
+# another package to a nix-support file.
+# `echo`s the full path name to the package derivation that is required.
+echo "Sourcing write-required-octave-packages-hook.sh"
+
+writeRequiredOctavePackagesPhase() {
+    echo "Executing writeRequiredOctavePackagesPhase"
+
+    mkdir -p $out/nix-support
+    echo ${requiredOctavePackages} > $out/nix-support/required-octave-packages
+}
+
+# Yes its a bit long...
+if [ -z "${dontWriteRequiredOctavePackagesPhase-}" ]; then
+    echo "Using writeRequiredOctavePackagesPhase"
+    preDistPhases+=" writeRequiredOctavePackagesPhase"
+fi