ghci: Add Hoogle commands

users/simon/modules/ghci.nix

@@ -4,8 +4,10 @@
   home.file.".ghc/ghci.conf".text = /* haskell */ ''
     :seti -XOverloadedStrings
 
-    -- Lambdabot (from https://wiki.haskell.org/GHC/GHCi#Lambdabot_Commands)
+    -- IDE-like features (from https://wiki.haskell.org/GHC/GHCi)
     dotGHCI_escapeShellArg arg = "'" ++ concatMap (\c -> if c == '\''' then "'\\'''" else [c]) arg ++ "'"
+
+    -- Lambdabot
     lb s1 s2 = return $ ":!lambdabot -n -e " ++ dotGHCI_escapeShellArg s1 ++ "\\ " ++ dotGHCI_escapeShellArg s2
     :def! lb lb ""                   -- runs arbitrary lambdabot commands
     :def! pl lb "pl"                 -- converts code to point-free (aka pointless) form
@@ -16,6 +18,11 @@
     :def! instances lb "instances"   -- finds all instances of a given type class
     :def! src lb "src"               -- tries to find the source code for the given identifier
     :def! oeis lb "oeis"             -- looks up the On-Line Encyclopedia of Integer Sequences (https://oeis.org/)
+
+    -- Hoogle
+    :def! hoogle return . (":!hoogle -q --count=15 --color " ++) . dotGHCI_escapeShellArg
+    :def! search return . (":!hoogle -q --count=3 --color " ++) . dotGHCI_escapeShellArg
+    :def! doc return . (":!hoogle -q --color --info " ++) . dotGHCI_escapeShellArg
   '';
 
   home.file.".haskeline".text = ''
@@ -27,6 +34,7 @@
   home.packages = with pkgs; [
     # GHC has a huge closure size, instead use nix-shell (ad-hoc or per-project)
     #ghc
+    #haskellPackages.hoogle
     #lambdabot
   ];
 }