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packager: terminal: split status too big to fit in screen 

Reviewed By: cpojer

Differential Revision: D4627512

fbshipit-source-id: 6e7b5f3a6e2d012a44373014f93ab17ef4f290a2
This commit is contained in:
Jean Lauliac 2017-02-28 06:41:12 -08:00 committed by Facebook Github Bot
parent c1a81571fc
commit 933f63478a
1 changed files with 10 additions and 0 deletions
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10
packages/metro-bundler/src/lib/terminal.js
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@ -31,6 +31,15 @@ function clearStringBackwards(stream: tty.WriteStream, str: string): void {
}
}
/**
* Cut a string into an array of string of the specific maximum size. A newline
* ends a chunk immediately (it's not included in the "." RexExp operator), and
* is not included in the result.
*/
function chunkString(str: string, size: number): Array<string> {
return str.match(new RegExp(`.{1,${size}}`, 'g')) || [];
}
/**
* We don't just print things to the console, sometimes we also want to show
* and update progress. This utility just ensures the output stays neat: no
@ -78,6 +87,7 @@ class Terminal {
const {_statusStr, _stream} = this;
if (_statusStr !== str && _stream instanceof tty.WriteStream) {
clearStringBackwards(_stream, _statusStr);
str = chunkString(str, _stream.columns).join('\n');
_stream.write(str);
}
this._statusStr = str;