implement CmdlineEnter loader

README.md

@@ -275,6 +275,7 @@ Shows the version of `miv`.
 - `function`: load the plugin on calling a function matching the value in regex
 - `mapping`: load the plugin on the mapping
 - `mapmode`: specify the mapmode for the `mapping` configuration (for example: `o`, `v`)
+- `cmdline`: specify the cmdline character to load the plugin (for example: `:`, `/`)
 - `insert`: load the plugin on entering the insert mode for the first time
 - `enable`: enable the plugin when the expression (in Vim script) is 1
 - `mapleader`: specify the mapleader (`<Leader>`) for the `script` configuration

miv.cabal

@@ -19,6 +19,7 @@ executable miv
                       , Setting
                       , Mode
                       , Command
+                      , Cmdline
                       , Mapping
                       , ShowText
                       , ReadText

src/Cmdline.hs

@@ -0,0 +1,51 @@
+{-# LANGUAGE OverloadedStrings #-}
+module Cmdline where
+
+import Data.Aeson
+import qualified Data.Aeson as Aeson
+import Data.Hashable
+import Data.Text (Text,unpack)
+import Prelude hiding (show)
+import qualified Prelude as Prelude
+
+import ReadText
+import ShowText
+
+data Cmdline = CmdlineExCommand
+             | CmdlineForwardSearch
+             | CmdlineBackwardSearch
+             | CmdlineInput
+             deriving (Eq, Ord)
+
+instance ShowText Cmdline where
+  show CmdlineExCommand      = ":"
+  show CmdlineForwardSearch  = "/"
+  show CmdlineBackwardSearch = "?"
+  show CmdlineInput          = "@"
+
+instance ReadText Cmdline where
+  read ":" = CmdlineExCommand
+  read "/" = CmdlineForwardSearch
+  read "?" = CmdlineBackwardSearch
+  read "@" = CmdlineInput
+  read m   = error $ "unknown cmdline: " ++ unpack m
+
+instance Hashable Cmdline where
+  hashWithSalt a CmdlineExCommand      = a `hashWithSalt` (0 :: Int)
+  hashWithSalt a CmdlineForwardSearch  = a `hashWithSalt` (1 :: Int)
+  hashWithSalt a CmdlineBackwardSearch = a `hashWithSalt` (2 :: Int)
+  hashWithSalt a CmdlineInput          = a `hashWithSalt` (3 :: Int)
+
+instance FromJSON Cmdline where
+  parseJSON (Aeson.String str)
+    | unpack str == ":" = return CmdlineExCommand
+    | unpack str == "/" = return CmdlineForwardSearch
+    | unpack str == "?" = return CmdlineBackwardSearch
+    | unpack str == "@" = return CmdlineInput
+  parseJSON o = error $ "failed to parse cmdline: " <> Prelude.show o
+
+cmdlinePattern :: Cmdline -> Text
+cmdlinePattern CmdlineExCommand      = ":"
+cmdlinePattern CmdlineForwardSearch  = "/"
+cmdlinePattern CmdlineBackwardSearch = "\\?"
+cmdlinePattern CmdlineInput          = "@"

src/Plugin.hs

@@ -6,6 +6,7 @@ import Data.Aeson
 import qualified Data.Text as T
 import Data.Text (Text, unpack)
 
+import Cmdline
 import ShowText
 
 data Plugin =
@@ -15,6 +16,7 @@ data Plugin =
             , functions  :: [Text]
             , mappings   :: [Text]
             , mapmodes   :: [Text]
+            , cmdlines   :: [Cmdline]
             , insert     :: Bool
             , enable     :: Text
             , sync       :: Bool
@@ -50,6 +52,7 @@ instance FromJSON Plugin where
     functions <- o .: "function" <|> (fmap return <$> o .:? "function") .!= []
     mappings <- o .: "mapping" <|> (fmap return <$> o .:? "mapping") .!= []
     mapmodes <- o .: "mapmode" <|> (fmap return <$> o .:? "mapmode") .!= []
+    cmdlines <- o .: "cmdline" <|> (fmap return <$> o .:? "cmdline") .!= []
     mapleader <- o .:? "mapleader" .!= ""
     insert <- o .:? "insert" .!= False
     enable <- o .:? "enable" .!= ""

src/VimScript.hs

@@ -1,17 +1,18 @@
 {-# LANGUAGE DeriveGeneric, OverloadedStrings #-}
 module VimScript where
 
-import Data.Char (isAlpha, isAlphaNum, toLower)
+import Data.Char (isAlpha, isAlphaNum, ord, toLower)
 import Data.Function (on)
 import Data.Hashable
 import qualified Data.HashMap.Lazy as HM
 import Data.List (foldl', groupBy, sort, sortBy, nub)
 import Data.Maybe (mapMaybe)
-import Data.Text (Text, unwords, singleton)
+import Data.Text (Text, singleton, unpack, unwords)
 import qualified Data.Text as T
 import GHC.Generics (Generic)
 import Prelude hiding (show, unwords, read)
 
+import Cmdline
 import qualified Command as C
 import qualified Mapping as M
 import Mode
@@ -78,6 +79,7 @@ gatherScript setting = addAutoloadNames
                     <> foldl' (<>) mempty (map pluginConfig plugins)
                     <> filetypeLoader setting
                     <> funcUndefinedLoader setting
+                    <> cmdlineEnterLoader setting
                     <> insertEnterLoader setting
                     <> filetypeScript (S.filetype setting)
                     <> syntaxScript (S.syntax setting)
@@ -151,7 +153,7 @@ pluginConfig plg
 loadScript :: P.Plugin -> [Text]
 loadScript plg
   | all null [ P.commands plg, P.mappings plg, P.functions plg, P.filetypes plg
-             , P.loadafter plg, P.loadbefore plg ] && not (P.insert plg)
+             , P.loadafter plg, P.loadbefore plg ] && null (P.cmdlines plg) && not (P.insert plg)
   = ["call miv#load(" <> singleQuote (show plg) <> ")"]
   | otherwise = []
 
@@ -312,6 +314,29 @@ funcUndefinedLoader _ = VimScript (HM.singleton Plugin
   , "endfunction"
   ])
 
+cmdlineEnterLoader :: S.Setting -> VimScript
+cmdlineEnterLoader setting
+  = HM.foldrWithKey f mempty $
+      foldr (uncurry (HM.insertWith (<>))) HM.empty
+        [ (cmdline, [p]) | p <- S.plugins setting, cmdline <- P.cmdlines p ]
+  where
+    f :: Cmdline -> [P.Plugin] -> VimScript -> VimScript
+    f cmdline plugins val = val <> VimScript (HM.singleton Plugin
+      [ "\" CmdlineEnter " <> (show cmdline)
+      , "augroup " <> group
+      , "  autocmd!"
+      , "  autocmd CmdlineEnter " <> (cmdlinePattern cmdline) <> " call miv#cmdline_enter_" <> c <> "()"
+      , "augroup END" ])
+      <> VimScript (HM.singleton (Autoload "") $
+       ("function! miv#cmdline_enter_" <> c <> "() abort") :
+      [ "  call miv#load(" <> singleQuote (show p) <> ")" | p <- plugins ]
+      <> [ "  autocmd! " <> group
+      , "  augroup! " <> group
+      , "endfunction"
+      ])
+      where c = T.concat $ map (show . ord) (unpack (show cmdline))
+            group = "miv-cmdline-enter-" <> c
+
 insertEnterLoader :: S.Setting -> VimScript
 insertEnterLoader setting = if null plugins then mempty else VimScript (HM.singleton Plugin
   [ "\" InsertEnter"