From 868de033ed2e68c4cf1bb16bd3f44e2dac0df526 Mon Sep 17 00:00:00 2001
From: Joe Crayne <joe@jerkface.net>
Date: Sun, 13 Oct 2019 17:45:34 -0400
Subject: Better usage documentation.

---
 monkeypatch.hs | 40 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 37 insertions(+), 3 deletions(-)

diff --git a/monkeypatch.hs b/monkeypatch.hs
index d6ff1c2..7da9c7d 100644
--- a/monkeypatch.hs
+++ b/monkeypatch.hs
@@ -1867,13 +1867,47 @@ includeStack bs = foldr go (const emptyIncludes) incs []
         | "2" `elem` B.words inc = xs (drop 1 stack)
         | otherwise              = xs stack
 
+usageString self = unlines
+    [ self ++ " [--cpp | -p | -t | --comments | --tohs ] [--nodo] [-v] [-f <sym>] -- [gcc options] [modules] <cfile>"
+    , ""
+    , "MODES"
+    , ""
+    , "  default Generate a monkey-patchable Haskell interface to given C module."
+    , ""
+    , "  --cpp   Show Preprocessor include stack (debugging output)."
+    , ""
+    , "  -p      Preprocess.  Output C with expanded macros (includes are NOT expanded)."
+    , ""
+    , "  -t      Tree.  Output language-c parse tree (verbose!)."
+    , ""
+    , "  --comments Output information about comment tokens occuring in file."
+    , ""
+    , "  --tohs  Attempt to translate C into Haskell (works on simple things)."
+    , ""
+    , "OPTIONS"
+    , ""
+    , "  -v        Verbose output."
+    , ""
+    , "  -f <sym>  Select a single function from the C file rather than the whole of it."
+    , "            This affects the default and --tohs modes."
+    , ""
+    , "  --nodo    In --tohs mode, avoid outputting do-syntax sugar."
+    , ""
+    , "ARGUMENTS"
+    , ""
+    , "  [gcc options]  Options passed to gcc during preprocessing or linking."
+    , ""
+    , "  [modules]      Extra modules (.c or .o).  When generating stubs, these symbols are excluded."
+    , ""
+    , "  <cfile>        The .c module being interfaced or preprocessed."
+    ]
+
 main :: IO ()
 main = do
     self <- getProgName
     args <- getArgs
-    let usageString = self ++ " [--cpp | -p | -t ] [-v] [-f <sym>] -- [gcc options] [modules] <cfile>"
     let m = usage args
-    fromMaybe (putStrLn usageString) $ m <&> \(hopts,cargs,fname:fs) -> do
+    fromMaybe (putStrLn $ usageString self) $ m <&> \(hopts,cargs,fname:fs) -> do
         prer <- runPreprocessor (newGCC "gcc") (rawCppArgs cargs fname)
         let r :: Either (Either ExitCode ParseError) (IncludeStack, CTranslUnit)
             r = do
@@ -1884,7 +1918,7 @@ main = do
         -- putStrLn $ "includes = " ++ ppShow (fmap fst r)
         -- cs <- readComments fname
         case () of
-            _ | oCommentsOnly hopts
+            _ | oCommentsOnly hopts -- --comments
                  -> do cs <- readComments fname
                        forM_ cs $ \c -> do
                             putStrLn $ show c
-- 
cgit v1.2.3