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nixpkgs/pkgs/development/haskell-modules/patches/gitit-pandoc-2.12.patch
sternenseemann 8babfa7fa5 haskellPackages.gitit: unbreak
pandoc 2.12 changed and removed a few exports gitit used. I procured a
patch which fixes those without any refactoring by vendoring in the
removed function from pandoc which is no problem as they are both
available under the GPL 2.0.
2021-04-02 15:25:51 +02:00

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commit a03d3b043458f45d29ba32068a77c0d3b8a4223f
Author: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Fri Apr 2 15:14:02 2021 +0200
Allow compilation with pandoc 2.12 and 2.13
pandoc 2.13 introduced the following breakages for gitit:
* UTF8.readFile now returns a Text which is actually ideal for gitit.
If pandoc is new enough we just make readFileUTF8 an alias for
UTF8.readFile.
* Text.Pandoc.Shared no longer exports substitute. In order to be
conservative I've chosen to just copy the substitute function from
pandoc 2.11.4. I need this patch kind of urgently so I didn't want to
make any changes or refactors independently from upstream if
avoidable. However, I'd be happy to rebase this PR branch to adopt a
different solution to just copying the function.
diff --git a/src/Network/Gitit/Authentication.hs b/src/Network/Gitit/Authentication.hs
index 4c240e7..c0f92fd 100644
--- a/src/Network/Gitit/Authentication.hs
+++ b/src/Network/Gitit/Authentication.hs
@@ -44,7 +44,7 @@ import System.Exit
import System.Log.Logger (logM, Priority(..))
import Data.Char (isAlphaNum, isAlpha)
import qualified Data.Map as M
-import Text.Pandoc.Shared (substitute)
+import Data.List (stripPrefix)
import Data.Maybe (isJust, fromJust, isNothing, fromMaybe)
import Network.URL (exportURL, add_param, importURL)
import Network.BSD (getHostName)
@@ -54,6 +54,16 @@ import Codec.Binary.UTF8.String (encodeString)
import Data.ByteString.UTF8 (toString)
import Network.Gitit.Rpxnow as R
+-- | Replace each occurrence of one sublist in a list with another.
+-- Vendored in from pandoc 2.11.4 as 2.12 removed this function.
+substitute :: (Eq a) => [a] -> [a] -> [a] -> [a]
+substitute _ _ [] = []
+substitute [] _ xs = xs
+substitute target replacement lst@(x:xs) =
+ case stripPrefix target lst of
+ Just lst' -> replacement ++ substitute target replacement lst'
+ Nothing -> x : substitute target replacement xs
+
data ValidationType = Register
| ResetPassword
deriving (Show,Read)
diff --git a/src/Network/Gitit/Util.hs b/src/Network/Gitit/Util.hs
index c5e9fe5..067130a 100644
--- a/src/Network/Gitit/Util.hs
+++ b/src/Network/Gitit/Util.hs
@@ -45,7 +45,11 @@ import Network.URL (encString)
-- | Read file as UTF-8 string. Encode filename as UTF-8.
readFileUTF8 :: FilePath -> IO Text
+#if MIN_VERSION_pandoc(2,12,0)
+readFileUTF8 = UTF8.readFile
+#else
readFileUTF8 = fmap T.pack . UTF8.readFile
+#endif
-- | Perform a function a directory and return to working directory.
inDir :: FilePath -> IO a -> IO a