Merge branch 'master' into release

Language/Haskell/GhcMod/Browse.hs

@@ -61,13 +61,23 @@ splitPkgMdl pkgmdl = case break (==':') pkgmdl of
     (mdl,"")    -> (Nothing,mdl)
     (pkg,_:mdl) -> (Just pkg,mdl)
 
+-- Haskell 2010:
+-- small -> ascSmall | uniSmall | _
+-- ascSmall -> a | b | ... | z
+-- uniSmall -> any Unicode lowercase letter
+-- varid -> (small {small | large | digit | ' })
+
+isNotOp :: String -> Bool
+isNotOp (h:_) = isAlpha h || (h == '_')
+isNotOp _ = error "isNotOp"
+
 processExports :: IOish m => ModuleInfo -> GhcModT m [String]
 processExports minfo = do
   opt <- options
   let
     removeOps
       | operators opt = id
-      | otherwise = filter (isAlpha . head . getOccString)
+      | otherwise = filter (isNotOp . getOccString)
   mapM (showExport opt minfo) $ removeOps $ G.modInfoExports minfo
 
 showExport :: IOish m => Options -> ModuleInfo -> Name -> GhcModT m String
@@ -87,10 +97,10 @@ showExport opt minfo e = do
           typeName <- tyResult >>= showThing dflag
           (" :: " ++ typeName) `justIf` detailed opt
       | otherwise = return Nothing
-    formatOp nm@(n:_)
-      | isAlpha n = nm
-      | otherwise = "(" ++ nm ++ ")"
-    formatOp "" = error "formatOp"
+    formatOp nm
+      | null nm    = error "formatOp"
+      | isNotOp nm = nm
+      | otherwise  = "(" ++ nm ++ ")"
     inOtherModule :: IOish m => Name -> GhcModT m (Maybe TyThing)
     inOtherModule nm = G.getModuleInfo (G.nameModule nm) >> G.lookupGlobalName nm
     justIf :: a -> Bool -> Maybe a

Language/Haskell/GhcMod/Monad.hs

@@ -77,7 +77,10 @@ import Data.Monoid (Monoid)
 
 import Control.Applicative (Alternative)
 import Control.Arrow (first)
-import Control.Monad (MonadPlus, void, liftM)
+import Control.Monad (MonadPlus, void)
+#if !MIN_VERSION_monad_control(1,0,0)
+import Control.Monad (liftM)
+#endif
 import Control.Monad.Base (MonadBase, liftBase)
 
 -- Monad transformer stuff
@@ -270,16 +273,18 @@ runGhcModT :: IOish m
            => Options
            -> GhcModT m a
            -> m (Either GhcModError a, GhcModLog)
-runGhcModT opt action = do
-    env <- liftBase $ newGhcModEnv opt =<< getCurrentDirectory
+runGhcModT opt action = gbracket newEnv delEnv $ \env -> do
     r <- first (fst <$>) <$> (runGhcModT' env defaultState $ do
         dflags <- getSessionDynFlags
         defaultCleanupHandler dflags $ do
             initializeFlagsWithCradle opt (gmCradle env)
             action)
-    liftBase $ cleanupGhcModEnv env
     return r
 
+ where
+   newEnv = liftBase $ newGhcModEnv opt =<< getCurrentDirectory
+   delEnv = liftBase . cleanupGhcModEnv
+
 -- | @hoistGhcModT result@. Embed a GhcModT computation's result into a GhcModT
 -- computation. Note that if the computation that returned @result@ modified the
 -- state part of GhcModT this cannot be restored.
@@ -366,6 +371,23 @@ withOptions changeOpt action = local changeEnv action
 instance (MonadBaseControl IO m) => MonadBase IO (GhcModT m) where
     liftBase = GhcModT . liftBase
 
+#if MIN_VERSION_monad_control(1,0,0)
+
+instance (MonadBaseControl IO m) => MonadBaseControl IO (GhcModT m) where
+    type StM (GhcModT m) a =
+          StM (StateT GhcModState
+                (ErrorT GhcModError
+                  (JournalT GhcModLog
+                    (ReaderT GhcModEnv m) ) ) ) a
+    liftBaseWith f = GhcModT . liftBaseWith $ \runInBase ->
+        f $ runInBase . unGhcModT
+
+    restoreM = GhcModT . restoreM
+    {-# INLINE liftBaseWith #-}
+    {-# INLINE restoreM #-}
+
+#else
+
 instance (MonadBaseControl IO m) => MonadBaseControl IO (GhcModT m) where
     newtype StM (GhcModT m) a = StGhcMod {
           unStGhcMod :: StM (StateT GhcModState
@@ -379,6 +401,8 @@ instance (MonadBaseControl IO m) => MonadBaseControl IO (GhcModT m) where
     {-# INLINE liftBaseWith #-}
     {-# INLINE restoreM #-}
 
+#endif
+
 -- GHC cannot prove the following instances to be decidable automatically using
 -- the FlexibleContexts extension as they violate the second Paterson Condition,
 -- namely that: The assertion has fewer constructors and variables (taken

Language/Haskell/GhcMod/Utils.hs

@@ -54,8 +54,7 @@ withDirectory_ dir action =
                 (\_ -> liftIO (setCurrentDirectory dir) >> action)
 
 uniqTempDirName :: FilePath -> FilePath
-uniqTempDirName dir =
-    uncurry (++)
+uniqTempDirName dir = ("ghc-mod"++) $ uncurry (++)
         $ map escapeDriveChar *** map escapePathChar
         $ splitDrive dir
  where

README.md

@@ -26,6 +26,14 @@ package is called `ghc` there, not `ghc-mod`) and install the
 % cabal update && cabal install ghc-mod
 ```
 
+### Nix & NixOS
+
+The installation is a little more involved in this environment as Nix needs some
+ugly hacks to get packages using the GHC API to work, please refer to this
+stackoverflow answer:
+
+http://stackoverflow.com/a/24228830
+
 ## Using the development version
 
 The easiest way to hack on ghc-mod is compile it, then add `dist/build/ghc-mod`

doc/Makefile

@@ -0,0 +1,10 @@
+all:
+	piki template.html index.piki > index.html
+	piki template.html install.piki > install.html
+	piki template.html ghc-mod.piki > ghc-mod.html
+	piki template.html ghc-modi.piki > ghc-modi.html
+	piki template.html emacs.piki > emacs.html
+	piki template.html preparation.piki > preparation.html
+	piki template.html copyright.piki > copyright.html
+	piki template.html history.piki > history.html
+	piki template.html bug.piki > bug.html

doc/bug.piki

@@ -0,0 +1,41 @@
+*Bugs
+
+If you found a bug relating the ghc-mod/ghc-modi commands or the ghc-mod library or the haskell-mode sub module, please record a ["issue on github" https://github.com/kazu-yamamoto/ghc-mod/issues].
+
+**ghc-mod
+
+***ghc-mod cannot work if a ".hsc" file exist
+
+Please convert it to ".hs" by "cabal build" or by hand with "hsc2hs".
+
+***ghc-mod cannot work if "Paths_<package>.hs" is missing
+
+Please create "Paths_<package>.hs" by "cabal build". If you want to create it by hand, please install the [cab http://www.mew.org/~kazu/proj/cab/en/] command.
+Typing "cab genpaths" in your package directory would help you.
+
+
+**ghc-modi
+
+***Ctr-c does not terminate ghc-modi
+
+ghc-modi uses multiple threads of Ghc monad.
+Ghc monad installs its own signal handlers
+and multiple threads of Ghc monad make the world messy.
+I cannot find a workaround.
+Just type RET to terminate ghc-modi.
+
+
+
+
+**Emacs front end
+
+***C-xC-s modifies the timestamp of the file even if there is no modification.
+
+In order to reload the file and check the syntax with GHC API (ghc-modi),
+it is necessary to update the timestamp of the file.
+A temporary file cannot maintain consistency of module dependency graph.
+If you know a workaround, please let me know.
+
+***M-C-d on a function or type cannot display it but the top of the page is displayed
+
+For instance, "open" on Mac removes "#anchor" from the "file:///" URL. So, the top of the file is displayed. Please use C-uM-C-d as workaround.

doc/copyright.piki

@@ -0,0 +1,5 @@
+*Copyright and license
+
+Copyright of this package belongs to ["IIJ Innovation Institute Inc" http://www.iij-ii.co.jp/en/].
+This package is available under BSD3 license.
+

doc/emacs.piki

@@ -0,0 +1,215 @@
+* Usage of Emacs front-end
+
+** Key bindings
+
+?M-C-i
+!Completes a name of keyword, module, class, function, types, language extensions, GHC flags, etc.
+?M-/
+!Completes a name of local symbol.
+?M-t
+!Inserts template. In the beginning of a buffer, "module Foo where" is inserted. On the function without signature, inferred type is inserted. On a symbol "foo" without definition, "foo = undefined" is inserted or a proper module is imported. C-uM-t inserts a hole in this case. On a variable, the case is split. When checking with hlint, original code is replaced with hlint's suggestion if possible.
+?M-C-d
+!Browses the local document with your browser. On a module import line, the document of the module is browsed. On a function or type, its document is browsed.
+?C-uM-C-d
+!Browses the Hackage document of the module with your browser.
+?M-C-m
+!Loads information of symbols for modules in the current buffer. If you add a new line to import a module, type this. The idle timer executes this command anyway.
+?C-cC-h
+!Query somthing at the cursor for hoogle.
+?C-xC-s
+!Saves the buffer if necessary and runs syntax check.
+?C-cC-c
+!Toggle GHC and Hlint for syntax check. GHC is used for initial time.
+?M-n
+!Goes to the next warning or error.
+?M-p
+!Goes to the previous warning or error.
+?M-?
+!Displays the warning/error message in the current line.
+?C-cC-i
+!Displays the info of this expression in another window.
+?C-cC-t
+!Displays the type of this expression in the minibuffer. Type C-cC-t multiple time to enlarge the expression.
+?C-cC-a
+!Selects one of possible cases.
+?C-cC-f
+!Replaces a hole with user-typed functions followed by holes.
+?C-cC-e
+!Displays the expanded Template Haskell.
+?C-cC-m
+!Insert "import Module" for the function at the cursor.
+?M-s
+!Sort and merge import statements in the region.
+?C-cC-j
+!In the beginning of the buffer, errors of other files are displayed. Typing C-cC-j on the errors jumps to the fist file of the error sources.
+?C-cC-k
+!Kill the ghc-modi subprocess for this project. If you install dependency packages, this command should be executed to reflect that change.
+?C-c<
+!Make the indentation of the region shallower.
+?C-c>
+!Make the indentation of the region deeper.
+
+** Resolving import hell
+
+Here is an example story not to type "import Foo" when
+you write a Haskell program.
+
+Type the following signature.
+Note that "ByteString" can be completed with M-C-i.
+
+>|
+foo :: [ByteString] -> [ByteString] -> [ByteString]
+|<
+
+C-xC-s highlights the signature.
+Typing M-t on the line results in:
+
+>|
+import Data.ByteString (ByteString)
+
+foo :: [ByteString] -> [ByteString] -> [ByteString]
+foo = undefined
+|<
+
+Type M-C-m to load symbols of Data.ByteString.
+Then edit the body of "foo".
+Note that "append" can be completed with M-C-i.
+
+>|
+import Data.ByteString (ByteString)
+
+foo :: [ByteString] -> [ByteString] -> [ByteString]
+foo bs1 bs2 = B.append <$> bs1 <*> bs2
+|<
+
+C-xC-s highlights the body.
+Type M-t to get:
+
+>|
+import Data.ByteString (ByteString)
+import Control.Applicative ((<*>))
+import Control.Applicative ((<$>))
+import qualified Data.ByteString as B
+
+foo :: [ByteString] -> [ByteString] -> [ByteString]
+foo bs1 bs2 = B.append <$> bs1 <*> bs2
+|<
+
+Now select a region for import statements (for instance,
+move the cursor, type C-SPC, and move the cursor) then
+type M-s.
+
+>|
+import Control.Applicative ((<$>), (<*>))
+import Data.ByteString (ByteString)
+import qualified Data.ByteString as B
+
+foo :: [ByteString] -> [ByteString] -> [ByteString]
+foo bs1 bs2 = B.append <$> bs1 <*> bs2
+|<
+
+**Type holes
+
+Consider the following broken example:
+
+>|
+foo :: [a -> a] -> a -> a
+foo xs = foldr bar id xs
+  where
+    bar = (:)
+|<
+
+C-xC-s highlights the 2nd line. C-c? displays the following:
+
+>|
+Couldn't match type `[a -> a]' with `a -> a'
+Expected type: (a -> a) -> (a -> a) -> a -> a
+  Actual type: (a -> a) -> [a -> a] -> [a -> a]
+...
+|<
+
+Even in this situation, C-cC-t on 'id' displays 'a -> a' in the minibuffer. GHC's -fdefer-type-errors enables this magic.
+
+Also, you can make use of GHC's hole. Inserting "_" before "bar" and typing C-xC-s results in highlighting the second line again:
+
+>|
+foo :: [a -> a] -> a -> a
+foo xs = foldr _bar id xs
+  where
+    bar = (:)
+|<
+
+C-c? displays:
+
+>|
+Found hole `_bar' with type: (a -> a) -> (a -> a) -> a -> a
+Where: `a' is a rigid type variable bound by
+           the type signature for foo :: [a -> a] -> a -> a
+           at /Users/kazu/c.hs:3:8
+Relevant bindings include
+  bar :: forall a. a -> [a] -> [a] (bound at /Users/kazu/c.hs:6:5)
+  xs :: [a -> a] (bound at /Users/kazu/c.hs:4:5)
+  foo :: [a -> a] -> a -> a (bound at /Users/kazu/c.hs:4:1)
+...
+|<
+
+**More type holes
+
+Suppose you have:
+
+>|
+filterNothing :: [Maybe a] -> [a]
+|<
+
+Typing M-t gets:
+
+>|
+filterNothing :: [Maybe a] -> [a]
+filterNothing = undefined
+|<
+
+On the other hand, typing C-uM-t gets:
+
+>|
+filterNothing :: [Maybe a] -> [a]
+filterNothing xs = _body
+|<
+
+Then, C-xC-s refreshes highlightings. When you type C-cC-f on "_body" and
+type "filter" in the minibuffer, you get:
+
+>|
+filterNothing :: [Maybe a] -> [a]
+filterNothing xs = filter _body_1 _body_2
+|<
+
+** Case handling
+
+Suppose you have:
+
+>|
+f :: [a] -> a
+f x = _f_body
+|<
+
+Typing M-t on "x" splits cases as follows:
+
+>|
+f :: [a] -> a
+f [] = _f_body
+f (x:xs) = _f_body
+|<
+
+Suppose you have:
+
+>|
+f :: a -> Maybe a
+f x = _f_body
+|<
+
+Typing C-cC-a on "_f_body" and selecting one of possible cases in another window results in:
+
+>|
+f :: a -> Maybe a
+f x = Nothing
+|<

doc/ghc-mod.piki

@@ -0,0 +1,38 @@
+*The ghc-mod command
+
+?ghc-mod list
+!Displays a list of modules
+?ghc-mod lang
+!Displays a list of language extensions
+?ghc-mod flag
+!Displays a list of GHC flags
+?ghc-mod browse \[<package>:\]<module>
+!Displays symbols of <module>
+?ghc-mod check <HaskellFile>
+!Checks syntax with GHC
+?ghc-mod expand <HaskellFile>
+!Expands Template Haskell
+?ghc-mod debug <HaskellFile>
+!Displays debug information
+?ghc-mod info <HaskellFile> <module> <expression>
+!Displays information about the expression
+?ghc-mod type <HaskellFile> <module> <line-no> <column-no>
+!Displays the types of all expressions including the expression
+?ghc-mod find <symbol>
+!Finds all module names exporting <symbol>
+?ghc-mod lint <HaskellFile>
+!Checks synstax with Hlint
+?ghc-mod root <HaskellFile>
+!Finds the root directory for the Haskell file
+?ghc-mod doc <module>
+!Finds the html document for the module
+?ghc-mod boot
+!Displays boot information for Emacs front-end
+?ghc-mod version
+!Displays the version of ghc-mod
+?ghc-mod help
+!Displays help messages
+
+<module> for "info" and "type" is not used, anything is OK.
+It is necessary to maintain backward compatibility.
+

doc/ghc-modi.piki

@@ -0,0 +1,48 @@
+*The ghc-modi command
+
+** Example
+
+>|
+% ghc-modi
+check Foo.hs
+Foo.hs:7:15:Not in scope: `B.append'
+OK
+bye
+NG quit
+%
+|<
+
+** Commands
+
+? check <HaskellFile>
+! Checks syntax with GHC
+? find <symbol>
+! Finds all module names exporting <symbol>
+? info <HaskellFile> <expr>
+! Displays information about the expression
+? type <HaskellFile> <line> <column>
+! Displays the types of all expressions including the expression
+? lint \[hlint options\] <HaskellFile>
+! Checks synstax with Hlint
+? boot
+! Displays boot information for Emacs front-end
+? browse \[<package>:\]<module>
+! Displays symbols of <module>
+? quit (or empty string)
+! Terminate ghc-modi
+
+** Options
+
+Option should be the form of Haskell's list of String (\[String\]).
+Here is an example:
+
+>|
+lint ["--ignore=Use camelCase", "--ignore=Eta reduce"] Foo.hs
+|<
+
+** Session separators
+
+?OK
+! The session succeeded.
+?NG <error message>
+! The session fails. ghc-modi gets finished.

doc/history.piki

@@ -0,0 +1,3 @@
+*History
+
+Please see [ChangeLog https://github.com/kazu-yamamoto/ghc-mod/blob/master/ChangeLog].

doc/index.piki

@@ -0,0 +1,26 @@
+*Happy Haskell Programming
+
+The ["ghc-mod command" ghc-mod.html] and ["ghc-modi command" ghc-modi.html] are backend commands to enrich Haskell programming on editors
+including Emacs, Vim, and Sublime.
+ghc-mod and ghc-modi are based on the ["ghc-mod library" http://hackage.haskell.org/packages/archive/ghc-mod/latest/doc/html/Language-Haskell-GhcMod.html]
+which is a wrapper of ["GHC API" http://www.haskell.org/ghc/docs/latest/html/libraries/ghc/] and [Cabal http://hackage.haskell.org/package/Cabal].
+
+The ["ghc-mod package" http://hackage.haskell.org/package/ghc-mod] on Hackage
+includes
+the ghc-mod command, the ghc-modi command, the ghc-mod library, and
+["Emacs front-end" emacs.html] (for historical reasons). 
+The ["source repository of ghc-mod" https://github.com/kazu-yamamoto/ghc-mod] is on github.
+
+**Emacs
+
+["Emacs front-end" emacs.html] is an extension of ["Haskell mode" https://github.com/haskell/haskell-mode]. They enable to complete Haskell symbols and to browse documents of modules. Syntax error highlighting with GHC/Hlint is also integrated. Moreover, you are free from "import hell".
+
+**Vim
+
+-[ghcmod-vim https://github.com/eagletmt/ghcmod-vim]
+-[syntastic https://github.com/scrooloose/syntastic]
+
+**Sublime
+
+-[SublimeHaskell https://github.com/SublimeHaskell/SublimeHaskell]
+

doc/install.piki

@@ -0,0 +1,28 @@
+*Installing "ghc-mod"
+
+This page assumes that you are a Haskell programmer and you know the "cabal" command well.
+
+**Installing the ghc-mod package
+
+First of all, update Cabal's database:
+
+>|
+% cabal update
+|<
+
+Now install "ghc-mod":
+
+>|
+% cabal install ghc-mod
+|<
+
+This command installs the followings:
+
+?~/.cabal/bin/ghc-mod
+!The ghc-mod commnad
+?~/.cabal/bin/ghc-modi
+!The ghc-modi commnad
+?~/.cabal/lib/ghc-mod-x.y.z/*
+!The ghc-mod library
+?~/.cabal/share/ghc-mod-x.y.z/ghc*.el
+!Elisp files to extend Haskell mode

doc/preparation.piki

@@ -0,0 +1,67 @@
+* Preparing Emacs front-end
+
+**Downloading
+
+Please use *stable* [MELPA http://melpa-stable.milkbox.net/] to download Emacs front-end. So, your "~/.emacs" should be:
+
+>|
+(require 'package)
+(add-to-list 'package-archives 
+         '("melpa" . "http://melpa-stable.milkbox.net/packages/"))
+(package-initialize)
+|<
+
+The package name is "ghc".
+Please don't forget ["install the latest cabal command" install.html].
+
+**Configuring "~/.emacs.el"
+
+Then, put the followings to your "~/.emacs.el" or "~/.emacs.d/init.el":
+
+>|
+(autoload 'ghc-init "ghc" nil t)
+(autoload 'ghc-debug "ghc" nil t)
+(add-hook 'haskell-mode-hook (lambda () (ghc-init)))
+|<
+
+IMPORTANT: if your haskell-mode-hook includes (flymake-mode), please remove it.
+
+**Testing
+
+Executes Emacs and opens a Haskell file by C-xC-f. And try to complete any keywords by M-C-i.
+
+**Debugging
+
+ghc-mod/ghc-modi must be compiled by GHC which you are actually using from Emacs. The version of Emacs front-end and ghc-mod/ghc-modi must be the same. To confirm this, type M-x ghc-debug.
+
+>|
+Path: check if you are using intended programs.
+	  ghc.el path: /Users/kazu/work/ghc-mod/elisp/ghc.el
+	 ghc-mod path: /Users/kazu/Library/Haskell/bin/ghc-mod
+	ghc-modi path: /Users/kazu/Library/Haskell/bin/ghc-modi
+	     ghc path: /usr/local/ghc-7.8/bin/ghc
+
+Version: all versions must be the same.
+	  ghc.el version 4.1.0
+	 ghc-mod version 4.1.0 compiled by GHC 7.8.2
+	ghc-modi version 4.1.0 compiled by GHC 7.8.2
+	The Glorious Glasgow Haskell Compilation System, version 7.8.2
+|<
+
+If you put (setq ghc-debug t) to your ".emacs", you can watch the communication between Emacs front-end and ghc-modi in the "*GHC Debug*" buffer.
+
+**Customizing
+
+If you want to specify GHC options from Emacs, set "ghc-ghc-options". 
+The following is an example to specify the "-i" options to GHC.
+
+>|
+(setq ghc-ghc-options '("-idir1" "-idir2"))
+|<
+
+An example to specify HLint options:
+
+>|
+(setq ghc-hlint-options '("--ignore=Use camelCase"))
+|<
+

elisp/ghc-doc.el

@@ -22,8 +22,8 @@
       (setq expr (ghc-read-expression expr0))
       (setq info (ghc-get-info expr0))
       (setq mod (ghc-extact-module-from-info info)))
-    (setq pkg-ver-path (ghc-resolve-document-path mod))
-    (if (and pkg-ver-path mod)
+    (setq pkg-ver-path (and mod (ghc-resolve-document-path mod)))
+    (if pkg-ver-path
 	(ghc-display-document pkg-ver-path mod haskell-org expr)
       (message "No document found"))))
 
@@ -75,7 +75,7 @@
     (apply 'concat (nreverse acc))))
 
 (defun ghc-extact-module-from-info (info)
-  (when (string-match "\`\\([^']+\\)'" info)
+  (when (string-match "[`\u2018]\\([^'\u2019]+\\)['\u2019]" info)
     (match-string 1 info)))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

elisp/ghc-process.el

@@ -111,13 +111,12 @@
     (setq ghc-process-results nil)
     (setq ghc-process-num-of-results (or n 1))
     (let ((pro (ghc-with-process cmd 'ghc-process-callback nil hook)))
+      ;; ghc-process-running is now t.
+      ;; But if the process exits abnormally, it is set to nil.
       (condition-case nil
-	  (while (null ghc-process-rendezvous)
-	    ;; 0.01 is too fast for Emacs 24.4.
-	    ;; (sit-for 0.1 t) may get stuck when tooltip is displayed.
-	    (sit-for 0.1)
-	    ;; (discard-input) avoids getting stuck.
-	    (discard-input))
+	  (let ((inhibit-quit nil))
+	    (while (and (null ghc-process-rendezvous) ghc-process-running)
+	      (accept-process-output pro 0.1 nil t)))
 	(quit
 	 (setq ghc-process-running nil))))
     ghc-process-results))

src/GHCMod.hs

@@ -87,7 +87,7 @@ ghcModUsage =
  \    - help | --help\n\
  \       Print this help message.\n\
  \\n\
- \    - list [FLAGS...]\n\
+ \    - list [FLAGS...] | modules [FLAGS...]\n\
  \        List all visible modules.\n\
  \      Flags:\n\
  \        -d\n\