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50 lines
1.3 KiB
50 lines
1.3 KiB
2 years ago
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var map = require('./map');
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var reduce = require('./reduce');
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var concat = require('./concat');
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var last = require('./last');
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var trim = require('./trim');
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exports = function(txt, width) {
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var lines = txt.split('\n');
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return map(lines, function(line) {
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return wrap(line, width);
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}).join('\n');
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};
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var regWordBoundary = /(\S+\s+)/;
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function wrap(txt, width) {
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var chunks = reduce(
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txt.split(regWordBoundary),
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function(chunks, word) {
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if (trim(word) === '') return chunks;
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if (word.length > width) {
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chunks = concat(
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chunks,
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word.match(new RegExp('.{1,'.concat(width, '}'), 'g'))
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);
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} else {
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chunks.push(word);
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}
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return chunks;
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},
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[]
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);
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var lines = reduce(
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chunks,
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function(lines, chunk) {
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var lastLine = last(lines);
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if (lastLine.length + chunk.length > width) {
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if (trim(lastLine) === '') {
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lines.pop();
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}
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lines.push(chunk);
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} else {
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lines[lines.length - 1] = lastLine + chunk;
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}
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return lines;
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},
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[chunks.shift()]
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);
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return lines.join('\n');
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}
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module.exports = exports;
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