3 files changed, 71 insertions, 0 deletions
diff --git a/src/cli/main.ts b/src/cli/main.ts
index 1fa9fce..52573fe 100644
--- a/src/cli/main.ts
+++ b/src/cli/main.ts
@@ -186,6 +186,37 @@ async function cmdProjects(flags: Record<string, string | boolean>): Promise<voi
   }
 }
 
+async function cmdCopy(positional: string[], flags: Record<string, string | boolean>): Promise<void> {
+  const sourceRef = positional[0]
+  const newName = positional[1]
+  if (!sourceRef || !newName) {
+    exitWith(EXIT_USAGE, 'Usage: lattex-cli copy <source-id|name> <new-name>')
+  }
+
+  const cookie = await resolveAuth(flags)
+  const api = new OverleafApi(cookie)
+
+  // Resolve project ID from name if needed
+  let sourceId = sourceRef
+  if (!sourceRef.match(/^[0-9a-f]{24}$/)) {
+    const projects = await api.listProjects()
+    const match = projects.find(p => p.name === sourceRef)
+    if (!match) {
+      exitWith(EXIT_ERROR, `Project not found: ${sourceRef}`)
+    }
+    sourceId = match!.id
+  }
+
+  err(`Copying project ${sourceId} as "${newName}"...`)
+  const newId = await api.copyProject(sourceId, newName)
+
+  if (jsonMode) {
+    jsonOut({ ok: true, sourceId, newId, newName })
+  } else {
+    out(`Copied → ${newId} "${newName}"`)
+  }
+}
+
 async function cmdClone(positional: string[], flags: Record<string, string | boolean>): Promise<void> {
   const projectRef = positional[0]
   const targetDir = positional[1]
@@ -693,6 +724,7 @@ Commands:
 
   projects [--json]     List Overleaf projects
 
+  copy <id|name> <name> Copy (clone) a project on Overleaf
   clone <id|name> <dir> Download project to local directory
   pull <dir>            Update local dir from Overleaf
   status <dir>          Show local changes
@@ -726,6 +758,9 @@ async function main(): Promise<void> {
       case 'projects':
         await cmdProjects(parsed.flags)
         break
+      case 'copy':
+        await cmdCopy(parsed.positional, parsed.flags)
+        break
       case 'clone':
         await cmdClone(parsed.positional, parsed.flags)
         break
diff --git a/src/cli/overleafApi.ts b/src/cli/overleafApi.ts
index 6301638..94bdac2 100644
--- a/src/cli/overleafApi.ts
+++ b/src/cli/overleafApi.ts
@@ -348,6 +348,17 @@ export class OverleafApi {
     }
   }
 
+  /** Clone (copy) a project on Overleaf, returning the new project ID */
+  async copyProject(sourceProjectId: string, newName: string): Promise<string> {
+    const result = await this.requestWithCsrf('POST', `/project/${sourceProjectId}/clone`, {
+      projectName: newName
+    })
+    if (!result.ok || !(result.data as any)?.project_id) {
+      throw new Error(`Copy project failed: HTTP ${result.status}`)
+    }
+    return (result.data as any).project_id
+  }
+
   /** Flush project (ensure OT changes are saved to database) */
   async flushProject(projectId: string): Promise<void> {
     await this.requestWithCsrf('POST', `/project/${projectId}/flush`)
diff --git a/src/cli/test.ts b/src/cli/test.ts
index e76182e..f81a89b 100644
--- a/src/cli/test.ts
+++ b/src/cli/test.ts
@@ -1,5 +1,6 @@
 // Tests for CLI arg parsing and diff logic
 import { parseArgs } from './args'
+import { OverleafApi } from './overleafApi'
 import { walkRootFolder } from './fileTree'
 import { join } from 'path'
 import { mkdtemp, writeFile, mkdir, rm } from 'fs/promises'
@@ -229,6 +230,28 @@ l.3 \\usepackage{nonexistent}`
   eq(entries4[0].line, 20, 'overfull line')
 }
 
+// ── copy command arg parsing test ──
+
+function testCopyArgs(): void {
+  console.log('--- copy args ---')
+
+  const r1 = parseArgs(['node', 'cli', 'copy', '6a965e135690947a3be20882', 'My New Project'])
+  eq(r1.command, 'copy', 'copy command')
+  eq(r1.positional, ['6a965e135690947a3be20882', 'My New Project'], 'copy positionals')
+
+  const r2 = parseArgs(['node', 'cli', 'copy', 'My Source', 'My Copy', '--json'])
+  eq(r2.command, 'copy', 'copy command with json')
+  eq(r2.positional, ['My Source', 'My Copy'], 'copy positionals by name')
+  eq(r2.flags.json, true, 'json flag with copy')
+}
+
+// ── OverleafApi.copyProject existence test ──
+
+function testCopyProjectMethod(): void {
+  console.log('--- copyProject method ---')
+  assert(typeof OverleafApi.prototype.copyProject === 'function', 'copyProject is a method on OverleafApi')
+}
+
 // ── Run all tests ──
 
 async function runTests(): Promise<void> {
@@ -237,6 +260,8 @@ async function runTests(): Promise<void> {
   testIsTextFile()
   await testComputeDiff()
   testParseCompileLog()
+  testCopyArgs()
+  testCopyProjectMethod()
 
   console.log(`\n${passed} passed, ${failed} failed`)
   process.exit(failed > 0 ? 1 : 0)