slice-file

slice-file

stream file slices by line number indexes

example

positive slice

var sf = require('slice-file');
var words = sf('/usr/share/dict/words');
words.slice(22398,22408).pipe(process.stdout);

beep
beep's
beeped
beeper
beeper's
beepers
beeping
beeps
beer
beer's

tail

var sf = require('slice-file');
var xs = sf('/usr/share/dict/words');
xs.slice(-10).pipe(process.stdout);

élan's
émigré
émigré's
émigrés
épée
épée's
épées
étude
étude's
études

methods

var sf = require('slice-file')

var xs = sf(filename, opts={})

Create a slice-file instance xs from a filename and some options opts.

These opts are passed to fs.open():

• opts.flags - string flags to open the file with, default "r"
• opts.mode - mask to open the file with, default 0666

If you already have a file descriptor open you can pass opts.fd to skip calling fs.open().

Use opts.bufsize to set how much data to read in each chunk. Default 4096.

var stream = xs.slice(i, j, cb)

Return a readable stream that emits each line between line numbers [i,j) exactly like Array.prototype.slice(). Each line data buffer includes a trailing "\n" except for the last line if there is no trailing newline before the EOF.

Just like Array.prototype.slice(), i and j may be negative.

If cb(err, lines) is given, the lines will be buffered into lines.

install

With npm do:

npm install slice-file

license

MIT