This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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168 lines
3.2 KiB
168 lines
3.2 KiB
'use strict'; |
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var stringWidth = require('string-width'); |
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var stripAnsi = require('strip-ansi'); |
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var ESCAPES = [ |
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'\u001b', |
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'\u009b' |
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]; |
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var END_CODE = 39; |
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var ESCAPE_CODES = { |
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0: 0, |
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1: 22, |
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2: 22, |
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3: 23, |
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4: 24, |
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7: 27, |
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8: 28, |
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9: 29, |
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30: 39, |
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31: 39, |
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32: 39, |
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33: 39, |
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34: 39, |
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35: 39, |
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36: 39, |
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37: 39, |
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90: 39, |
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40: 49, |
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41: 49, |
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42: 49, |
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43: 49, |
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44: 49, |
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45: 49, |
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46: 49, |
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47: 49 |
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}; |
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function wrapAnsi(code) { |
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return ESCAPES[0] + '[' + code + 'm'; |
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} |
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// calculate the length of words split on ' ', ignoring |
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// the extra characters added by ansi escape codes. |
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function wordLengths(str) { |
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return str.split(' ').map(function (s) { |
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return stringWidth(s); |
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}); |
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} |
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// wrap a long word across multiple rows. |
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// ansi escape codes do not count towards length. |
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function wrapWord(rows, word, cols) { |
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var insideEscape = false; |
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var visible = stripAnsi(rows[rows.length - 1]).length; |
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for (var i = 0; i < word.length; i++) { |
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var x = word[i]; |
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rows[rows.length - 1] += x; |
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if (ESCAPES.indexOf(x) !== -1) { |
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insideEscape = true; |
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} else if (insideEscape && x === 'm') { |
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insideEscape = false; |
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continue; |
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} |
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if (insideEscape) { |
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continue; |
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} |
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visible++; |
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if (visible >= cols && i < word.length - 1) { |
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rows.push(''); |
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visible = 0; |
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} |
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} |
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// it's possible that the last row we copy over is only |
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// ansi escape characters, handle this edge-case. |
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if (!visible && rows[rows.length - 1].length > 0 && rows.length > 1) { |
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rows[rows.length - 2] += rows.pop(); |
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} |
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} |
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// the wrap-ansi module can be invoked |
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// in either 'hard' or 'soft' wrap mode. |
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// |
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// 'hard' will never allow a string to take up more |
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// than cols characters. |
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// |
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// 'soft' allows long words to expand past the column length. |
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function exec(str, cols, opts) { |
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var options = opts || {}; |
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var pre = ''; |
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var ret = ''; |
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var escapeCode; |
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var lengths = wordLengths(str); |
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var words = str.split(' '); |
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var rows = ['']; |
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for (var i = 0, word; (word = words[i]) !== undefined; i++) { |
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var rowLength = stringWidth(rows[rows.length - 1]); |
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if (rowLength) { |
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rows[rows.length - 1] += ' '; |
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rowLength++; |
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} |
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// in 'hard' wrap mode, the length of a line is |
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// never allowed to extend past 'cols'. |
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if (lengths[i] > cols && options.hard) { |
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if (rowLength) { |
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rows.push(''); |
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} |
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wrapWord(rows, word, cols); |
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continue; |
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} |
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if (rowLength + lengths[i] > cols && rowLength > 0) { |
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if (options.wordWrap === false && rowLength < cols) { |
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wrapWord(rows, word, cols); |
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continue; |
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} |
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rows.push(''); |
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} |
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rows[rows.length - 1] += word; |
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} |
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pre = rows.map(function (r) { |
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return r.trim(); |
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}).join('\n'); |
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for (var j = 0; j < pre.length; j++) { |
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var y = pre[j]; |
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ret += y; |
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if (ESCAPES.indexOf(y) !== -1) { |
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var code = parseFloat(/[0-9][^m]*/.exec(pre.slice(j, j + 4))); |
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escapeCode = code === END_CODE ? null : code; |
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} |
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if (escapeCode && ESCAPE_CODES[escapeCode]) { |
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if (pre[j + 1] === '\n') { |
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ret += wrapAnsi(ESCAPE_CODES[escapeCode]); |
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} else if (y === '\n') { |
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ret += wrapAnsi(escapeCode); |
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} |
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} |
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} |
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return ret; |
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} |
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// for each line break, invoke the method separately. |
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module.exports = function (str, cols, opts) { |
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return String(str).split('\n').map(function (substr) { |
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return exec(substr, cols, opts); |
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}).join('\n'); |
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};
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