Add unused import detection workflow

.github/workflows/unused-imports.yml

@@ -0,0 +1,134 @@
+name: CI / Unused Imports Check
+
+on:
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  check-unused-imports:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+
+    steps:
+      - name: Checkout PR code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Setup Zig
+        uses: mlugg/setup-zig@v2
+        with:
+          version: 0.15.1
+
+      - name: Build zigimports
+        run: |
+          git clone --depth 1 https://github.com/tusharsadhwani/zigimports.git /tmp/zigimports
+          cd /tmp/zigimports
+          zig build --release=safe
+          # Binary is named zigimports-<arch>-<os>, find and symlink it
+          ln -s /tmp/zigimports/zig-out/bin/zigimports-* /tmp/zigimports/zig-out/bin/zigimports
+
+      - name: Get changed Zig files
+        id: changed-files
+        run: |
+          FILES=$(git diff --name-only --diff-filter=d ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }} | grep '\.zig$' || true)
+          echo "files<<EOF" >> $GITHUB_OUTPUT
+          echo "$FILES" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
+      - name: Check for unused imports
+        id: check
+        run: |
+          RESULTS=""
+          echo "${{ steps.changed-files.outputs.files }}" | while read file; do
+            if [ -n "$file" ] && [ -f "$file" ]; then
+              /tmp/zigimports/zig-out/bin/zigimports "$file" 2>&1 || true
+            fi
+          done | tee unused_imports.txt
+
+          # Set output for later steps
+          if grep -q "is unused" unused_imports.txt 2>/dev/null; then
+            echo "has_issues=true" >> $GITHUB_OUTPUT
+          else
+            echo "has_issues=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Post PR comment
+        if: steps.check.outputs.has_issues == 'true'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+
+            const content = fs.readFileSync('unused_imports.txt', 'utf8').trim();
+            const lines = content.split('\n').filter(l => l.includes('is unused'));
+
+            if (lines.length === 0) return;
+
+            // Check for existing comment and update it
+            const marker = '<!-- unused-imports-check -->';
+            const comments = await github.paginate(
+              github.rest.issues.listComments,
+              {
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number
+              }
+            );
+
+            const existing = comments.find(c =>
+              c.user.login === 'github-actions[bot]' &&
+              c.body.includes(marker)
+            );
+
+            let body = '## ⚠️ Unused Imports Found\n\n';
+            body += '```\n' + lines.join('\n') + '\n```\n\n';
+            body += 'Run `zigimports --fix <file>` locally to automatically remove unused imports.\n\n';
+            body += marker;
+
+            if (existing) {
+              await github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing.id,
+                body: body
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body: body
+              });
+            }
+
+      - name: Remove comment if no issues
+        if: steps.check.outputs.has_issues == 'false'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const marker = '<!-- unused-imports-check -->';
+            const comments = await github.paginate(
+              github.rest.issues.listComments,
+              {
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number
+              }
+            );
+
+            const existing = comments.find(c =>
+              c.user.login === 'github-actions[bot]' &&
+              c.body.includes(marker)
+            );
+
+            if (existing) {
+              await github.rest.issues.deleteComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing.id
+              });
+            }

tools/sorcerer/src/RegzWindow.zig

@@ -120,7 +120,6 @@ const Allocator = std.mem.Allocator;
 const regz = @import("regz");
 const VirtualFilesystem = regz.VirtualFilesystem;
 const RegisterSchemaUsage = @import("RegisterSchemaUsage");
-const diffz = @import("diffz");
 
 const dvui = @import("dvui");
 

tools/sorcerer/src/main.zig

@@ -1,7 +1,5 @@
 const std = @import("std");
-const builtin = @import("builtin");
 const dvui = @import("dvui");
-const serial = @import("serial");
 const regz = @import("regz");
 const schemas = @import("schemas");
 const RegisterSchemaUsage = @import("RegisterSchemaUsage");