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Fix line wrapping issue #21

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Fix line wrapping issue #21

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bec4f26
Fix line wrapping issue
luismulinari Dec 5, 2025
5562f2e
Add terminal-width wrapping test case
luismulinari Dec 5, 2025
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7 changes: 3 additions & 4 deletions index.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
var MOVE_LEFT = new Buffer('1b5b3130303044', 'hex').toString();
var MOVE_UP = new Buffer('1b5b3141', 'hex').toString();
var CLEAR_LINE = new Buffer('1b5b304b', 'hex').toString();
var stringWidth = require('string-width');
Expand All @@ -23,9 +22,9 @@ module.exports = function(stream) {
str = '';
var nextStr = Array.prototype.join.call(arguments, ' ');

// Clear screen
// Move to beginning of line and clear, then move up for each previous line
for (var i=0; i<prevLineCount; i++) {
str += MOVE_LEFT + CLEAR_LINE + (i < prevLineCount-1 ? MOVE_UP : '');
str += '\r' + CLEAR_LINE + (i < prevLineCount-1 ? MOVE_UP : '');
}

// Actual log output
Expand All @@ -41,7 +40,7 @@ module.exports = function(stream) {
};

log.clear = function() {
stream.write('');
stream.write('\n');
};

return log;
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2 changes: 2 additions & 0 deletions test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,8 @@ setInterval(function() {
if (i < 30) s += '\nline 3 - ' + Math.random();
if (i < 20) s += '\nline 4 - ' + Math.random();

if (i < 10) s += '\nline 5 - Long line - ' + '*'.repeat(process.stdout.columns) + ' - ' + Math.random();

log(s);

if (i === 50) {
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