# Merge / Diff algo **URL:** \ **Category:** Ruby\ **Created:** [March 15, 2007, 11:10pm UTC](https://www.ruby-forum.com/t/merge-diff-algo/88965 "2007-03-15T23:10:49Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![robertjames](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e9c0ed/32.png) [@robertjames](https://www.ruby-forum.com/u/robertjames)\ **Post date:** [March 15, 2007, 11:10pm UTC](https://www.ruby-forum.com/t/merge-diff-algo/88965/1 "2007-03-15T23:10:49Z")
Is there any lib to do simple text based merges (3 way) from Ruby? Perhaps it’s simple enough to do without an external lib. Just need to see which lines child1 added to parent, which ones child1 deleted, and same for child2, and then merge them - in order… Hmmm… perhaps I should use an external lib… ---
**Author:** ![robertjames](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e9c0ed/32.png) [@robertjames](https://www.ruby-forum.com/u/robertjames)\ **Post date:** [March 15, 2007, 11:56pm UTC](https://www.ruby-forum.com/t/merge-diff-algo/88965/2 "2007-03-15T23:56:55Z")
On Fri, 16 Mar 2007, S. Robert J. wrote: > Is there any lib to do simple text based merges (3 way) from Ruby? > > Perhaps it’s simple enough to do without an external lib. Just need > to see which lines child1 added to parent, which ones child1 deleted, > and same for child2, and then merge them - in order… > > Hmmm… perhaps I should use an external lib… `diff3 -Em myfile oldfile yourfile` John C. Phone : (64)(3) 358 6639 Tait Electronics Fax : (64)(3) 359 4632 PO Box 1645 Christchurch Email : removed\_email\_address@domain.invalid New Zealand ---
**Author:** ![robertjames](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e9c0ed/32.png) [@robertjames](https://www.ruby-forum.com/u/robertjames)\ **Post date:** [March 16, 2007, 1:59am UTC](https://www.ruby-forum.com/t/merge-diff-algo/88965/3 "2007-03-16T01:59:07Z")
On 3/15/07, S. Robert J. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Is there any lib to do simple text based merges (3 way) from Ruby? > > Perhaps it’s simple enough to do without an external lib. Just need > to see which lines child1 added to parent, which ones child1 deleted, > and same for child2, and then merge them - in order… > > Hmmm… perhaps I should use an external lib… I seem to recall that someone had put some merge operations around Diff::LCS. -austin