convert renderer to async

lib/renderer.ts

@@ -1,55 +1,30 @@
-import { mkdir, writeFile } from 'fs'
-import { spawn } from 'child_process'
+import { promisify } from 'util'
+import { promises } from 'fs'
+import { exec } from 'child_process'
 import { v1 as uuidv1 } from 'uuid'
-
 import { getDirPath, getDocPath, getTexCmd } from './utils'
 
-function copyToTemp(id: string, texDocument: string): Promise<string> {
-  return new Promise((resolve, reject) => {
-    const dirPath = getDirPath(id)
+const execPromise = promisify(exec)
 
-    mkdir(dirPath, (err) => {
-      if (err) {
-        reject(err)
-        return
-      }
+async function copyToTemp(id: string, texDocument: string): Promise<void> {
+  const dirPath = getDirPath(id)
+  const docPath = getDocPath(id)
 
-      const docPath = getDocPath(id)
-      writeFile(docPath, texDocument, (err) => {
-        if (err) {
-          reject(err)
-        }
-        resolve(id)
-      })
-    })
-  })
+  await promises.mkdir(dirPath)
+  await promises.writeFile(docPath, texDocument)
 }
 
-function generateDoc(id: string) {
-  return new Promise((resolve, reject): void => {
-    const pdflatex = spawn(...getTexCmd(id))
-    pdflatex.stderr?.on('data', (data: string) => {
-      console.error('error: ', data)
-      reject()
-    })
-    pdflatex.on('error', (error) => {
-      console.error('error', error)
-      reject()
-    })
-
-    pdflatex.on('close', (code) => {
-      if (code !== null && code > 0) {
-        reject(`pdflatex returned with code ${code}`)
-        return
-      }
-      console.log(`PDF ${id} generated`)
-      resolve(id)
-    })
-  })
+async function generateDoc(id: string) {
+  const { cmd, options } = getTexCmd(id)
+  const { stdout, stderr } = await execPromise(cmd, options)
+  stdout.length && console.log('stdout:', stdout)
+  stderr.length && console.error('error: ', stderr)
+  console.log(`PDF ${id} generated`)
 }
 
 export default async function (texDocument: string) {
   const id = uuidv1()
-  const id_2 = await copyToTemp(id, texDocument)
-  return generateDoc(id_2)
+  await copyToTemp(id, texDocument)
+  await generateDoc(id)
+  return id
 }

lib/utils.ts

@@ -1,4 +1,4 @@
-import { CommonSpawnOptions } from 'node:child_process'
+import { ExecOptions } from 'node:child_process'
 import path from 'path'
 
 export function getDirPath(id: string) {
@@ -13,6 +13,9 @@ export function getPdfPath(id: string) {
   return path.join(getDirPath(id), 'doc.pdf')
 }
 
-export function getTexCmd(id: string): [command: string, args: ReadonlyArray<string>, options: CommonSpawnOptions] {
-  return ['pdflatex', ['-interaction', 'nonstopmode', getDocPath(id)], { cwd: getDirPath(id) }]
+export function getTexCmd(id: string): { cmd: string; options: ExecOptions } {
+  return {
+    cmd: `pdflatex -interaction nonstopmode ${getDocPath(id)}`,
+    options: { cwd: getDirPath(id) },
+  }
 }