CI: install Nushell from latest nightly build

.github/workflows/ci.yml

@@ -3,9 +3,14 @@ on:
   push:
     branches:
       - main
+  workflow_dispatch:
 
 name: continuous-integration
 
+defaults:
+  run:
+    shell: bash
+
 jobs:
   tests:
     strategy:
@@ -18,13 +23,51 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Setup Rust toolchain
-        uses: actions-rust-lang/[email protected]
-        with:
-          rustflags: ""
+      - name: Set platform-specific variables
+        run: |
+          if [ "${{ runner.os }}" = "Linux" ]; then
+            echo "ARCH=x86_64-linux-gnu-full" >> $GITHUB_ENV
+            echo "EXT=tar.gz" >> $GITHUB_ENV
+            echo "NU_BIN=nu" >> $GITHUB_ENV
+            echo "CWD=$PWD" >> $GITHUB_ENV
+          elif [ "${{ runner.os }}" = "Windows" ]; then
+            echo "ARCH=x86_64-pc-windows-msvc" >> $GITHUB_ENV
+            echo "EXT=zip" >> $GITHUB_ENV
+            echo "NU_BIN=nu.exe" >> $GITHUB_ENV
+            # NOTE: for some reason, `$PWD` gives an incorrect path on Windows, e.g. it looks like
+            # `/d/a/nupm/nupm` where it should really be `d:\a\nupm\nupm`: this commands changes the
+            # `/` into `\` and replaces the first part of the path with "x:\"
+            echo "CWD=$(echo $PWD | tr '/' '\\' | sed 's/^\\\(.\)\\/\1:\\/')" >> $GITHUB_ENV
+          elif [ "${{ runner.os }}" = "macOS" ]; then
+            echo "ARCH=x86_64-apple-darwin" >> $GITHUB_ENV
+            echo "EXT=tar.gz" >> $GITHUB_ENV
+            echo "NU_BIN=nu" >> $GITHUB_ENV
+            echo "CWD=$PWD" >> $GITHUB_ENV
+          fi
+
+      - name: Install Nushell from Nightly
+        run: |
+          tarball=$(\
+            curl -L https://api.github.com/repos/nushell/nightly/releases \
+                | jq 'sort_by(.published_at) | reverse | .[0].assets'\
+                | jq '.[] | select(.name | test("${{ env.ARCH }}.${{ env.EXT }}")) | {name, browser_download_url}'\
+            )
+          name=$(echo $tarball | jq '.name' | tr -d '"' | sed 's/.${{ env.EXT }}$//')
+          url=$(echo $tarball | jq '.browser_download_url' | tr -d '"')
+
+          curl -fLo $name $url
+
+          if [ "${{ env.EXT }}" = "tar.gz" ]; then
+            tar xvf $name --directory /tmp
+          elif [ "${{ env.EXT }}" = "zip" ]; then
+            unzip $name -d "/tmp/$name"
+          fi
+          cp "/tmp/$name/${{ env.NU_BIN }}" "$HOME/${{ env.NU_BIN }}"
 
-      - name: Install Nushell
-        run: cargo install --locked --git https://github.com/nushell/nushell.git nu
+      - name: Show Nushell Version
+        run: |
+          "$HOME/${{ env.NU_BIN }}" --commands "version"
 
       - name: Run the tests
-        run: nu --commands "use $PWD/nupm/; nupm test"
+        run: |
+          "$HOME/${{ env.NU_BIN }}" --commands "use ${{ env.CWD }}/nupm/; nupm test"

nupm/install.nu

@@ -128,7 +128,7 @@ def install-path [
 
             do {
                 cd $tmp_dir
-                nu $build_file ($pkg_dir | path join 'package.nuon')
+                ^$nu.current-exe $build_file ($pkg_dir | path join 'package.nuon')
             }
 
             rm -rf $tmp_dir

nupm/test.nu

@@ -18,7 +18,7 @@ export def main [
     print $'Testing package ($pkg_root)'
     cd $pkg_root
 
-    let tests = nu [
+    let tests = ^$nu.current-exe [
         --no-config-file
         --commands
         'use tests/
@@ -34,7 +34,7 @@ export def main [
         | where ($filter in $it)
         | par-each {|test|
             let res = do {
-                nu [
+                ^$nu.current-exe [
                     --no-config-file
                     --commands
                     $'use tests/; ($test)'