add no-color option

Author: cricrio

packages/gatsby-cli/src/create-cli.js

@@ -60,7 +60,8 @@ function buildLocalCommands(cli, isLocalSite) {
   function getCommandHandler(command, handler) {
     return argv => {
       report.setVerbose(!!argv.verbose)
-
+      report.setNoColor(!!argv.noColor)
+      
       process.env.gatsby_log_level = argv.verbose ? `verbose` : `normal`
       report.verbose(`set gatsby_log_level: "${process.env.gatsby_log_level}"`)
 
@@ -175,6 +176,12 @@ module.exports = (argv, handlers) => {
       describe: `Turn on verbose output`,
       global: true,
     })
+    .option(`no-color`,{
+      default: false,
+      type: `boolean`,
+      describe: `Turn off the color in output`,
+      global: true,
+    })
 
   buildLocalCommands(cli, isLocalSite)
 

packages/gatsby-cli/src/reporter/index.js

@@ -17,7 +17,11 @@ module.exports = Object.assign(reporter, {
   setVerbose(isVerbose = true) {
     this.isVerbose = !!isVerbose
   },
-
+  setNoColor(isNoColor = false){
+    if(isNoColor){
+      errorFormatter.withoutColors()
+    }
+  },
   panic(...args) {
     this.error(...args)
     process.exit(1)