urbit/pkg/arvo/ted/diff.hoon
Philip Monk 4c758372d6
clay: minimal -diff thread
Barebones 2-way diff thread.  Further development should include:

- recognize at least %txt and %hoon diff types as (urge:clay cord) and
print them prettily

- check if they're directories and recurse through them, noting files
that exist in one or the other and diffing ones that exist in both

- support 3-way diffs.  Since we know the desks they're on, we can find
a mergebase (see how +trouble gets the base-hash in #3378) and do a
3-way diff.

- extend the above to support all the useful diffs, including
diff3(a,b), diff2(mergebase(a,b),a) and any other useful ones.
2020-08-27 21:14:47 -07:00

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/- spider
/+ strandio
=, strand=strand:spider
^- thread:spider
|= arg=vase
=/ m (strand ,vase)
^- form:m
|^
=+ !<([=a=path =b=path ~] arg)
=/ a-mark=mark -:(flop a-path)
=/ b-mark=mark -:(flop b-path)
?. =(a-mark b-mark)
(strand-fail:strandio %files-not-same-type ~)
=/ a-beam (need (de-beam:format a-path))
;< =a=cage bind:m (get-file a-path)
;< =b=cage bind:m (get-file b-path)
;< =dais:clay bind:m (build-mark:strandio -.a-beam a-mark)
(pure:m (~(diff dais q.a-cage) q.b-cage))
::
++ get-file
|= =path
=/ m (strand ,cage)
^- form:m
=/ beam (need (de-beam:format path))
;< =riot:clay bind:m
(warp:strandio p.beam q.beam ~ %sing %x r.beam (flop s.beam))
?~ riot
(strand-fail:strandio %file-not-found >path< ~)
(pure:m r.u.riot)
--