Created skeleton for Groovy implementation, basic Nim implementation.

.gitignore

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+*.sw?
+nimcache/
+build/
+.gradle/

build.gradle

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+apply plugin: "groovy"
+apply plugin: "maven"
+
+group = "com.jdblabs"
+version = "alpa"
+

src/main/groovy/com/jdblabs/file/TreeDiff.groovy

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+package com.jdblabs.file
+
+import com.jdblabs.util.LightOptionParser
+
+public class TreeDiff {
+
+
+}

treediff.nim

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+import os, docopt, tables, md5, iterutils, re
+
+proc studyDir(root: string, ignore: Iterable[string]): TableRef[string, string] =
+    result = newTable[string, string]()
+
+    for path in walkDirRec(root):
+        var relPath = substr(path, len(root))
+
+        if foldl(ignore, proc (acc: bool, it: string): bool = acc and match(relPath, re(it)), true): continue
+
+        var fileInfo = getFileInfo(path)
+
+        if fileInfo.kind == pcFile:
+            result.add(relPath, $(toMD5(readFile(path))))
+        elif fileInfo.kind == pcDir:
+            result.add(relPath, "directory")
+
+when isMainModule:
+
+    let doc = """
+treediff
+
+Usage:
+  treediff [-i <regex>]... [<path>]...
+  treediff (-h | --help)
+  treediff (-v | --version)
+
+Options:
+  -h --help     Show this usage information.
+  -v --version  Show the program version.
+"""
+
+    let args = docopt(doc, version = "treediff 0.1")
+
+    for root in @(args["<path>"]):
+        echo "Looking at ", root
+
+        echo studyDir(root, @(args["<regex>"]))
+        echo ""

treediff.nimble

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+[Package]
+name          = "treeediff"
+version       = "0.1.0"
+author        = "Jonathan Bernard (jdb@jdb-labs.com)"
+description   = "Tree Diff"
+license       = "BSD"
+
+bin           = "treediff"
+
+[Deps]
+Requires: "nim >= 0.10.0, docopt >= 0.1.0, iterutils >= 0.1.0"