wat

By a public request, let's support aliases for architecture parameters.
Treat "arch: Win32" as "x86" and "Win64" as "x64".

Test this on CI just in case x86 breaks or something.

.github/workflows/main.yml

@@ -6,7 +6,7 @@ on:
     branches:
       - master
       - release/*
-      - wip/path-test
+      - wip/bash
   schedule:
     - cron: '0 6 * * *'
 
@@ -19,19 +19,22 @@ jobs:
         uses: actions/checkout@v2
       - name: Download Internet
         run: npm install
-      - name: What's in the env?
-        shell: cmd
-        run: set
       - name: Enable Developer Command Prompt
         uses: ./
-      - name: What's in the env now?
-        shell: cmd
-        run: set
       - name: Compile and run some C code
         shell: cmd
         run: |
           cl.exe hello.c
           hello.exe
+      - name: Extra path
+        shell: bash
+        run: echo "C:\\foo" >> $GITHUB_PATH
+      - name: Check out bash env
+        shell: bash
+        run: |
+          env
+          which link || :
+          which cl   || :
   audit:
     name: npm audit
     if: false
@@ -41,3 +44,21 @@ jobs:
         uses: actions/checkout@v2
       - run: npm install
       - run: npm audit --audit-level=moderate
+  alias-arch:
+    name: arch aliases
+    if: false
+    runs-on: windows-latest
+    steps:
+      - name: Check out source code
+        uses: actions/checkout@v2
+      - name: Download Internet
+        run: npm install
+      - name: Enable Developer Command Prompt
+        uses: ./
+        with:
+          arch: Win32
+      - name: Compile and run some C code
+        shell: cmd
+        run: |
+          cl.exe hello.c
+          hello.exe

README.md

@@ -11,7 +11,9 @@ Supports Windows. Does nothing on Linux and macOS.
 ## Inputs
 
 - `arch` – target architecture
-  - native compilation: `x86`, `x64` (default), `amd64` (synonym for x64)
+  - native compilation:
+    - `x64` (default) or its synonyms: `amd64`, `win64`
+    - `x86` or its synonyms: `win32`
   - cross-compilation: `x86_amd64`, `x86_arm`, `x86_arm64`,
   	`amd64_x86`, `amd64_arm`, `amd64_arm64`
 - `sdk` – Windows SDK to use

index.js

@@ -77,12 +77,23 @@ function main() {
     // Add standard location of "vswhere" to PATH, in case it's not there.
     process.env.PATH += path.delimiter + VSWHERE_PATH
 
-    const arch    = core.getInput('arch')
+    var   arch    = core.getInput('arch')
     const sdk     = core.getInput('sdk')
     const toolset = core.getInput('toolset')
     const uwp     = core.getInput('uwp')
     const spectre = core.getInput('spectre')
 
+    // There are all sorts of way the architectures are called. In addition to
+    // values supported by Microsoft Visual C++, recognize some common aliases.
+    let arch_aliases = {
+        "win32": "x86",
+        "win64": "x64",
+    }
+    // Ignore case when matching as that's what humans expect.
+    if (arch.toLowerCase() in arch_aliases) {
+        arch = arch_aliases[arch.toLowerCase()]
+    }
+
     // Due to the way Microsoft Visual C++ is configured, we have to resort to the following hack:
     // Call the configuration batch file and then output *all* the environment variables.
 
@@ -104,6 +115,24 @@ function main() {
     core.debug(`Running: ${command}`)
     const environment = child_process.execSync(command, {shell: "cmd"}).toString().split('\r\n')
 
+    // If vsvars.bat is given an incorrect command line, it will print out
+    // an error and *still* exit successfully. Parse out errors from output
+    // which don't look like environment variables, and fail if appropriate.
+    var failed = false
+    for (let line of environment) {
+        if (line.match(/^\[ERROR.*\]/)) {
+            failed = true
+            // Don't print this particular line which will be confusing in output.
+            if (line.match(/Error in script usage. The correct usage is:$/)) {
+                continue
+            }
+            core.error(line)
+        }
+    }
+    if (failed) {
+        throw new Error('invalid parameters')
+    }
+
     for (let string of environment) {
         const [name, value] = string.split('=')
         for (let pattern of InterestingVariables) {