Pre gap input

README.md

@@ -20,6 +20,12 @@ All of the following inputs are optional.
 - `GAP_TESTFILE`:
   - The name of the GAP file to be read for executing the package tests.
   - default: `'tst/testall.g'`
+- `pre-gap`:
+  - Commands to be executed immediately before GAP is launched. For example,
+    specifying `'valgrind --trace-children=yes --leak-check=full'` will ensure
+    that GAP is launched using Valgrind, and the test-suite will be checked for
+    memory leaks.
+  - default: `''`
 
 ### Example
 
@@ -46,10 +52,12 @@ jobs:
 ```
 
 ## Contact
+
 Please submit bug reports, suggestions for improvements and patches via
 the [issue tracker](https://github.com/gap-actions/run-pkg-tests/issues).
 
 ## License
+
 The action `run-pkg-tests` is free software; you can redistribute
 and/or modify it under the terms of the GNU General Public License as published
 by the Free Software Foundation; either version 2 of the License, or (at your

action.yml

@@ -16,6 +16,11 @@ inputs:
     required: false
     type: boolean
     default: false
+  pre-gap:
+    description: 'Commands to be executed immediately before GAP is launched (e.g. ''valgrind --trace-children=yes --leak-check=full'')'
+    required: false
+    type: string
+    default: ''
 env:
   CHERE_INVOKING: 1
 
@@ -37,8 +42,9 @@ runs:
          mkdir -p /tmp/gaproot/pkg/
          ln -f -s $PWD /tmp/gaproot/pkg/
 
-         # start GAP with custom GAP root, to ensure correct package version is loaded
-         GAP="$GAPROOT/gap -l /tmp/gaproot; --quitonbreak"
+         # start GAP with custom GAP root and any pre-gap commands, to ensure
+         # correct package version is loaded
+         GAP="${{ inputs.pre-gap }} $GAPROOT/gap -l /tmp/gaproot; --quitonbreak"
 
          if ${{ inputs.only-needed }} = 'true' ; then
            GAP="$GAP -A"