From 8b0968b2054d3bb8d90b5ac056727f7c2ebeaed3 Mon Sep 17 00:00:00 2001
From: Igor Pashev <pashev.igor@gmail.com>
Date: Tue, 11 Dec 2018 18:10:48 +0300
Subject: (* HUGE *) Use nixpkgs overlays

---
 pkgs/xinclude2nix/xinclude2nix.hs | 49 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 pkgs/xinclude2nix/xinclude2nix.hs

(limited to 'pkgs/xinclude2nix/xinclude2nix.hs')

diff --git a/pkgs/xinclude2nix/xinclude2nix.hs b/pkgs/xinclude2nix/xinclude2nix.hs
new file mode 100644
index 0000000..369f103
--- /dev/null
+++ b/pkgs/xinclude2nix/xinclude2nix.hs
@@ -0,0 +1,49 @@
+{-# LANGUAGE Arrows #-}
+
+{-
+ Takes a list of XML files
+ Parses them for xi:xinclude elements
+ Extract included files
+ Prints list of included files
+-}
+module Main
+  ( main
+  ) where
+
+import Data.List (isPrefixOf, stripPrefix)
+import Data.Maybe (fromMaybe)
+import System.Environment (getArgs)
+import Text.XML.HXT.Core
+       ((>>>), deep, getAttrValue, hasAttr, hasName, isElem, readDocument,
+        returnA, runX)
+
+getXIncludes :: FilePath -> IO [String]
+getXIncludes xmlFileName =
+  runX $
+  readDocument [] xmlFileName >>>
+  deep (isElem >>> hasName "xi:include" >>> hasAttr "href") >>>
+  proc d ->
+  do href <- getAttrValue "href" -< d
+     returnA -< href
+
+getFiles :: [String] -> [String]
+getFiles = map stripScheme . filter isFile
+  where
+    fileScheme = "file://"
+    isFile s = "/" `isPrefixOf` s || (fileScheme `isPrefixOf` s)
+    stripScheme u = fromMaybe u (stripPrefix fileScheme u)
+
+unique :: [String] -> [String]
+unique [] = []
+unique (x:xs)
+  | x `elem` xs = unique xs
+  | otherwise = x : unique xs
+
+toNix :: [String] -> String
+toNix ss = "[" ++ unwords (map show ss) ++ "]"
+
+main :: IO ()
+main = do
+  paths <- getArgs
+  includedFiles <- unique . getFiles . concat <$> mapM getXIncludes paths
+  putStrLn $ toNix includedFiles
-- 
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