eq directive

render.ts

@@ -1,9 +1,23 @@
-import { readdirSync, statSync, readFileSync, mkdirSync, writeFileSync } from "node:fs"
+import { readdirSync, statSync, readFileSync, mkdirSync, writeFileSync, rmSync } from "node:fs"
 import { join } from "node:path"
 
-const IF_PATH_RE = /^<@if\(context\.(.+?)\)>(.*)$/
+const IF_PATH_RE = /^<@if\((.+?)\)>(.*)$/
 const VAR_RE = /<@var\(context\.(.+?)(?::(\w+))?\)>/g
-const DIRECTIVE_RE = /<@(if|elseif|else|endif)(?:\(context\.(.+?)\))?>/g
+const DIRECTIVE_RE = /<@(if|elseif|else|endif)(?:\((.+?)\))?>/g
+const EQ_RE = /^eq\(context\.(.+?),\s*"(.*)"\)$/
+const PATH_RE = /^context\.(.+)$/
+
+function evalCondition(expr: string, context: Record<string, unknown>): boolean {
+  const eqMatch = expr.match(EQ_RE)
+  if (eqMatch) {
+    return resolve(context, eqMatch[1]!) === eqMatch[2]
+  }
+  const pathMatch = expr.match(PATH_RE)
+  if (pathMatch) {
+    return !!resolve(context, pathMatch[1]!)
+  }
+  throw new Error(`Invalid condition expression: ${expr}`)
+}
 
 function resolve(context: Record<string, unknown>, path: string): unknown {
   const segments = path.split(".")
@@ -36,7 +50,7 @@ function processIfBlocks(content: string, context: Record<string, unknown>): str
 
     if (directive === "if") {
       if (isEmitting()) result += content.slice(pos, match.index)
-      const truthy = !!resolve(context, condPath!)
+      const truthy = evalCondition(condPath!, context)
       stack.push({ matched: truthy, active: truthy })
       pos = re.lastIndex
     } else if (directive === "elseif") {
@@ -48,7 +62,7 @@ function processIfBlocks(content: string, context: Record<string, unknown>): str
         // A previous branch already matched — skip this one
         top.active = false
       } else {
-        const truthy = !!resolve(context, condPath!)
+        const truthy = evalCondition(condPath!, context)
         top.matched = truthy
         top.active = truthy
       }
@@ -87,6 +101,15 @@ function renderDir(
   srcDir: string,
   destDir: string,
   context: Record<string, unknown>,
+) {
+  rmSync(destDir, { recursive: true, force: true })
+  renderDirInner(srcDir, destDir, context)
+}
+
+function renderDirInner(
+  srcDir: string,
+  destDir: string,
+  context: Record<string, unknown>,
 ) {
   mkdirSync(destDir, { recursive: true })
   const entries = readdirSync(srcDir).sort()
@@ -99,8 +122,7 @@ function renderDir(
     const ifMatch = entry.match(IF_PATH_RE)
     let outputName = entry
     if (ifMatch) {
-      const conditionPath = ifMatch[1]!
-      if (!resolve(context, conditionPath)) continue
+      if (!evalCondition(ifMatch[1]!, context)) continue
       outputName = ifMatch[2]!
     }
 
@@ -111,7 +133,7 @@ function renderDir(
 
     const destPath = join(destDir, outputName)
     if (stat.isDirectory()) {
-      renderDir(srcPath, destPath, context)
+      renderDirInner(srcPath, destPath, context)
     } else {
       mkdirSync(destDir, { recursive: true })
       const content = readFileSync(srcPath, "utf-8")