From 0ab014ed1e5890e338792fab98aecc45cd889f99 Mon Sep 17 00:00:00 2001
From: Albert Krewinkel <albert@zeitkraut.de>
Date: Thu, 29 Sep 2022 14:09:48 +0200
Subject: [API Change] App: parameterize `options` over the scripting engine

---
 pandoc-cli/src/pandoc.hs                  |  8 +++++---
 src/Text/Pandoc/App/CommandLineOptions.hs | 18 +++++++++---------
 test/test-pandoc.hs                       |  5 +++--
 3 files changed, 17 insertions(+), 14 deletions(-)

diff --git a/pandoc-cli/src/pandoc.hs b/pandoc-cli/src/pandoc.hs
index ca5cf6651..216198291 100644
--- a/pandoc-cli/src/pandoc.hs
+++ b/pandoc-cli/src/pandoc.hs
@@ -20,7 +20,7 @@ import Text.Pandoc.App ( convertWithOpts, defaultOpts, options
                        , parseOptionsFromArgs)
 import Text.Pandoc.Class (runIOorExplode)
 import Text.Pandoc.Error (handleError)
-import Text.Pandoc.Lua (runLua, runLuaNoEnv)
+import Text.Pandoc.Lua (getEngine, runLua, runLuaNoEnv)
 import Text.Pandoc.Shared (pandocVersionText)
 import qualified Text.Pandoc.UTF8 as UTF8
 import PandocCLI.Server
@@ -37,8 +37,10 @@ main = E.handle (handleError . Left) $ do
       case rawArgs of
         "lua" : args   -> runLuaInterpreter "pandoc lua" args
         "serve" : args -> runServer args
-        _              -> parseOptionsFromArgs options defaultOpts prg rawArgs
-                          >>= convertWithOpts
+        _              -> do
+          engine <- getEngine
+          let opts = options engine
+          parseOptionsFromArgs opts defaultOpts prg rawArgs >>= convertWithOpts
 
 -- | Runs pandoc as a Lua interpreter that is (mostly) compatible with
 -- the default @lua@ program shipping with Lua.
diff --git a/src/Text/Pandoc/App/CommandLineOptions.hs b/src/Text/Pandoc/App/CommandLineOptions.hs
index 8d5677b82..abd7703a4 100644
--- a/src/Text/Pandoc/App/CommandLineOptions.hs
+++ b/src/Text/Pandoc/App/CommandLineOptions.hs
@@ -53,6 +53,7 @@ import Text.Pandoc.App.Opt (Opt (..), LineEnding (..), IpynbOutput (..),
                             fullDefaultsPath)
 import Text.Pandoc.Filter (Filter (..))
 import Text.Pandoc.Highlighting (highlightingStyles, lookupHighlightingStyle)
+import Text.Pandoc.Scripting (ScriptingEngine (engineName))
 import Text.Pandoc.Shared (ordNub, elemText, safeStrRead, defaultUserDataDir)
 import Text.Printf
 
@@ -145,8 +146,8 @@ pdfEngines = ordNub $ map snd engines
 
 -- | A list of functions, each transforming the options data structure
 --   in response to a command-line option.
-options :: [OptDescr (Opt -> IO Opt)]
-options =
+options :: ScriptingEngine -> [OptDescr (Opt -> IO Opt)]
+options scriptingEngine =
     [ Option "fr" ["from","read"]
                  (ReqArg
                   (\arg opt -> return opt { optFrom =
@@ -828,7 +829,8 @@ options =
                      let optnames (Option shorts longs _ _) =
                            map (\c -> ['-',c]) shorts ++
                            map ("--" ++) longs
-                     let allopts = unwords (concatMap optnames options)
+                     let allopts = unwords (concatMap optnames
+                                            (options scriptingEngine))
                      UTF8.hPutStrLn stdout $ T.pack $ printf tpl allopts
                          (T.unpack $ T.unwords readersNames)
                          (T.unpack $ T.unwords writersNames)
@@ -960,14 +962,11 @@ options =
                   (\_ -> do
                      prg <- getProgName
                      defaultDatadir <- defaultUserDataDir
-                     luaVersion <- HsLua.run @HsLua.Exception $ do
-                       openlibs
-                       getglobal "_VERSION"
-                       peek top
                      UTF8.hPutStrLn stdout
                       $ T.pack
                       $ prg ++ " " ++ T.unpack pandocVersionText ++ versionSuffix ++
-                        compileInfo ++ "\nScripting engine: " ++ luaVersion ++
+                        compileInfo ++ "\nScripting engine: " ++
+                        T.unpack (engineName scriptingEngine) ++
                         "\nUser data directory: " ++ defaultDatadir ++
                         ('\n':copyrightMessage)
                      exitSuccess ))
@@ -977,7 +976,8 @@ options =
                  (NoArg
                   (\_ -> do
                      prg <- getProgName
-                     UTF8.hPutStr stdout (T.pack $ usageMessage prg options)
+                     UTF8.hPutStr stdout (T.pack $ usageMessage prg
+                                          (options scriptingEngine))
                      exitSuccess ))
                  "" -- "Show help"
     ]
diff --git a/test/test-pandoc.hs b/test/test-pandoc.hs
index 5552bc450..467e264f0 100644
--- a/test/test-pandoc.hs
+++ b/test/test-pandoc.hs
@@ -7,6 +7,7 @@ import qualified Control.Exception as E
 import Text.Pandoc.App (convertWithOpts, defaultOpts, options,
                         parseOptionsFromArgs)
 import Text.Pandoc.Error (handleError)
+import Text.Pandoc.Scripting (noEngine)
 import GHC.IO.Encoding
 import Test.Tasty
 import qualified Tests.Command
@@ -112,8 +113,8 @@ main = do
   case args of
     "--emulate":args' -> -- emulate pandoc executable
           E.catch
-            (parseOptionsFromArgs options defaultOpts "pandoc" args' >>=
-              convertWithOpts)
+            (parseOptionsFromArgs (options noEngine) defaultOpts "pandoc" args'
+             >>= convertWithOpts)
             (handleError . Left)
     _ -> inDirectory "test" $ do
            fp <- getExecutablePath
-- 
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