cmCTestRunTest: Implement the ENVIRONMENT test property with EnvDiff too

Going through the same internal API for both `ENVIRONMENT` and
`ENVIRONMENT_MODIFICATION` properties will make it easier to implement
checkpointing for `MYVAR=reset:` more efficiently if the need ever
presents itself.  It also makes the two-stage nature of the environment
mutation clearer in the code itself.

1 files changed, 9 insertions, 0 deletions

diff --git a/Source/cmSystemTools.h b/Source/cmSystemTools.h
index 3c5c28c..e8c04b1 100644
--- a/Source/cmSystemTools.h
+++ b/Source/cmSystemTools.h
@@ -388,6 +388,15 @@ public:
   class EnvDiff
   {
   public:
+    /** Append multiple variables to the current environment diff */
+    void AppendEnv(std::vector<std::string> const& env);
+
+    /**
+     * Add a single variable (or remove if no = sign) to the current
+     * environment diff.
+     */
+    void PutEnv(const std::string& env);
+
     /**
      * Apply an ENVIRONMENT_MODIFICATION operation to this diff. Returns
      * false and issues an error on parse failure.