Switch to native Rust for nu_protocol handling (#26)

Tracking changes in the Nu plugin protocol by hand was too onerous.

This is a major change so that the plugin is now native Rust, and spawns the Bash script as a subprocess.

Fixes #25

.github/workflows/test-suite.yml

@@ -1,7 +1,7 @@
 name: test suite
 on: [push, pull_request]
 env:
-  NU_VERSION: 0.96.1
+  NU_VERSION: 0.97.1
 
 jobs:
   test:
@@ -15,10 +15,16 @@ jobs:
           curl -L https://github.com/nushell/nushell/releases/download/${NU_VERSION}/nu-${NU_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar xzf -
       - name: Version Check
         run: |
-          ./nu-${NU_VERSION}-x86_64-unknown-linux-gnu/nu --version
+          export PATH=./nu-${NU_VERSION}-x86_64-unknown-linux-gnu:$PATH
+          nu --version
           bash --version
           jq --version
+      - name: Install Rust Toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Build
+        run: cargo build
       - name: Run Tests
         run: |
-          ./nu-${NU_VERSION}-x86_64-unknown-linux-gnu/nu --no-config-file --no-history -c "plugin add --plugin-config plugin.msgpackz nu_plugin_bash_env"
-          ./nu-${NU_VERSION}-x86_64-unknown-linux-gnu/nu --no-config-file --no-history -c "plugin use --plugin-config plugin.msgpackz bash_env ; use tests.nu run_bash_env_tests ; run_bash_env_tests"
+          export PATH=./nu-${NU_VERSION}-x86_64-unknown-linux-gnu:$PATH
+          nu --no-config-file --no-history -c "plugin add --plugin-config plugin.msgpackz target/debug/nu_plugin_bash_env"
+          nu --no-config-file --no-history -c "plugin use --plugin-config plugin.msgpackz bash_env ; use tests.nu run_bash_env_tests ; run_bash_env_tests"

.gitignore

@@ -1,2 +1,4 @@
+/target/
 /.direnv/
+/result
 plugin.msgpackz