86 lines
3.4 KiB
Haskell
86 lines
3.4 KiB
Haskell
{- | Editor integration. -}
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-- {-# LANGUAGE OverloadedStrings #-}
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module Hledger.UI.Editor
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where
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import Control.Applicative ((<|>))
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import Data.List
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import Safe
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import System.Environment
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import System.Exit
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import System.FilePath
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import System.Process
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import Hledger
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-- | Editors we know how to create more specific command lines for.
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data EditorType = Emacs | EmacsClient | Vi | Other
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-- | A position we can move to in a text editor: a line and optional column number.
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-- 1 (or 0) means the first and -1 means the last (and -2 means the second last, etc.
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-- though this may not be well supported.)
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type TextPosition = (Int, Maybe Int)
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endPos :: Maybe TextPosition
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endPos = Just (-1,Nothing)
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-- | Try running the user's preferred text editor, or a default edit command,
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-- on the main journal file, blocking until it exits, and returning the exit code;
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-- or raise an error.
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runEditor :: Maybe TextPosition -> FilePath -> IO ExitCode
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runEditor mpos f = editorOpenPositionCommand mpos f >>= runCommand >>= waitForProcess
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-- Get the basic shell command to start the user's preferred text editor.
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-- This is the value of environment variable $HLEDGER_UI_EDITOR, or $EDITOR, or
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-- a default (emacsclient -a '' -nw, start/connect to an emacs daemon in terminal mode).
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editorCommand :: IO String
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editorCommand = do
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hledger_ui_editor_env <- lookupEnv "HLEDGER_UI_EDITOR"
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editor_env <- lookupEnv "EDITOR"
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let Just cmd =
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hledger_ui_editor_env
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<|> editor_env
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<|> Just "emacsclient -a '' -nw"
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return cmd
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-- | Get a shell command to start the user's preferred text editor, or a default,
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-- and optionally jump to a given position in the file. This will be the basic
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-- editor command, with the appropriate options added, if we know how.
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-- Currently we know how to do this for emacs and vi.
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-- Some examples:
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-- $EDITOR=notepad -> "notepad FILE"
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-- $EDITOR=vi -> "vi +LINE FILE"
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-- $EDITOR=vi, line -1 -> "vi + FILE"
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-- $EDITOR=emacs -> "emacs +LINE:COL FILE"
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-- $EDITOR=emacs, line -1 -> "emacs FILE -f end-of-buffer"
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-- $EDITOR not set -> "emacs -nw FILE -f end-of-buffer"
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--
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editorOpenPositionCommand :: Maybe TextPosition -> FilePath -> IO String
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editorOpenPositionCommand mpos f = do
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cmd <- editorCommand
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let f' = singleQuoteIfNeeded f
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return $
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case (identifyEditor cmd, mpos) of
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(EmacsClient, Just (l,mc)) | l >= 0 -> cmd ++ " " ++ emacsposopt l mc ++ " " ++ f'
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(EmacsClient, Just (l,mc)) | l < 0 -> cmd ++ " " ++ emacsposopt 999999999 mc ++ " " ++ f'
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(Emacs, Just (l,mc)) | l >= 0 -> cmd ++ " " ++ emacsposopt l mc ++ " " ++ f'
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(Emacs, Just (l,_)) | l < 0 -> cmd ++ " " ++ f' ++ " -f end-of-buffer"
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(Vi, Just (l,_)) -> cmd ++ " " ++ viposopt l ++ " " ++ f'
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_ -> cmd ++ " " ++ f'
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where
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emacsposopt l mc = "+" ++ show l ++ maybe "" ((":"++).show) mc
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viposopt l = "+" ++ if l >= 0 then show l else ""
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-- Identify which text editor is used in the basic editor command, if possible.
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identifyEditor :: String -> EditorType
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identifyEditor cmd
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| "emacsclient" `isPrefixOf` exe = EmacsClient
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| "emacs" `isPrefixOf` exe = Emacs
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| exe `elem` ["vi","vim","ex","view","gvim","gview","evim","eview","rvim","rview","rgvim","rgview"]
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= Vi
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| otherwise = Other
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where
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exe = lowercase $ takeFileName $ headDef "" $ words' cmd
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