text-history

Keeps track of changes to text so you can pull specific versions and patch an old version

• Retrieve any version
• Get patches to transform any version to the last version added
• Changes stored with deltas to save space

var TextHistory = require('text-history');

var history = new TextHistory();
var id1 = history.addVersion('document version 1');
var id2 = history.addVersion('document version 2');

console.assert(history.getVersion(id1) === 'document version 1');
console.assert(history.getVersion(id2) === 'document version 2');

var patches = history.getPatches(id1);
// diff_match_patch is a different module
console.assert(diff_match_patch.patch_apply(patches, 'document version 1')[0] === 'document version 2');

TextHistory

new TextHistory()

Construct a new TextHistory object.

history.addVersion(text)

Add a new, updated version of the text. Returns a string id used to access the version again.

history.getVersion(id)

Retrieve text from the version of id. Returns undefined if version id does not exist.

history.hasVersion(id)

Returns boolean value whether the version id exists or not.

history.lastVersion

The text of the latest version (last added) in the history.

history.getPatches(id)

Get the patches to transform the text of version id into the last version. Returns an array of patches than can be used in [google-difff-patch-match] (https://code.google.com/p/google-diff-match-patch/) to patch a version to the lastest version.