Transform a file as a stream in place (with a temp file, but retaining inode info)
Take a look at the test folder for more usages, but the basic idea is you pass in a file, a transform callback and a done callback and it calls the transform callback on each chunk passing in a buffer and a boolean that's true if it's the last chunk in the file, the callback can be async or sync, by either accepting a third arg or not. Here's an example:
var transformFile = require('transform-file');
transformFile(
__dirname + '/package.json',
function(buffer, isLastChunk) {
return buffer.toString().toUpperCase() + (isLastChunk ? '\n\n\n' : '');
},
function() {
fs.readFile(__dirname + '/package.json', function(err, buffer) {
console.log(buffer.toString()); // uppercase with trailing newlines
});
}
);
// same as above just async
transformFile(
__dirname + '/package.json',
function(buffer, isLastChunk, next) {
setTimeout(function() {
// notice we use next() and not return
next(buffer.toString().toUpperCase() + (isLastChunk ? '\n\n\n' : ''));
}, 10);
},
function() {
fs.readFile(__dirname + '/package.json', function(err, buffer) {
console.log(buffer.toString()); // uppercase with trailing newlines
});
}
);
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