Cannot read property 'push' of undefined

[paulirish]

Here's what I get while running pretty-diff on master.

$ pretty-diff
/Users/paulirish/.homebrew/lib/node_modules/pretty-diff/diff.js:48
        files[ filename ].push( line );
                         ^
TypeError: Cannot read property 'push' of undefined
    at /Users/paulirish/.homebrew/lib/node_modules/pretty-diff/diff.js:48:20
    at Array.forEach (native)
    at splitByFile (/Users/paulirish/.homebrew/lib/node_modules/pretty-diff/diff.js:35:21)
    at ChildProcess.<anonymous> (/Users/paulirish/.homebrew/lib/node_modules/pretty-diff/diff.js:25:14)
    at ChildProcess.emit (events.js:110:17)
    at maybeClose (child_process.js:1015:16)
    at Socket.<anonymous> (child_process.js:1183:11)
    at Socket.emit (events.js:107:17)
    at Pipe.close (net.js:485:12)

[paulirish]

Ah, it's because of two issues

1. color.ui = always will toss in color codes and mess up the ^diff --git regex
2. i'm currently doing diff on a merge conflict which uses diff --cc instead. (what --cc is about)

raw output:

diff --cc Source/devtools/front_end/timeline/TimelinePanel.js