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44 lines
1.3 KiB
JavaScript
44 lines
1.3 KiB
JavaScript
var common = require('./common');
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var fs = require('fs');
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//@
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//@ ### sed([options ,] search_regex, replacement, file)
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//@ Available options:
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//@
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//@ + `-i`: Replace contents of 'file' in-place. _Note that no backups will be created!_
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//@
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//@ Examples:
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//@
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//@ ```javascript
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//@ sed('-i', 'PROGRAM_VERSION', 'v0.1.3', 'source.js');
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//@ sed(/.*DELETE_THIS_LINE.*\n/, '', 'source.js');
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//@ ```
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//@
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//@ Reads an input string from `file` and performs a JavaScript `replace()` on the input
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//@ using the given search regex and replacement string or function. Returns the new string after replacement.
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function _sed(options, regex, replacement, file) {
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options = common.parseOptions(options, {
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'i': 'inplace'
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});
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if (typeof replacement === 'string' || typeof replacement === 'function')
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replacement = replacement; // no-op
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else if (typeof replacement === 'number')
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replacement = replacement.toString(); // fallback
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else
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common.error('invalid replacement string');
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if (!file)
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common.error('no file given');
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if (!fs.existsSync(file))
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common.error('no such file or directory: ' + file);
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var result = fs.readFileSync(file, 'utf8').replace(regex, replacement);
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if (options.inplace)
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fs.writeFileSync(file, result, 'utf8');
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return common.ShellString(result);
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}
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module.exports = _sed;
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