Merge pull request #1252 from nthapaliya/fish-shell-linter

Fish shell linter

doc/ale-fish.txt

@@ -0,0 +1,14 @@
+===============================================================================
+ALE Fish Integration                                         *ale-fish-options*
+
+Lints fish files using `fish -n`.
+
+Note that `fish -n` is not foolproof: it sometimes gives false positives or
+errors that are difficult to parse without more context. This integration skips
+displaying errors if an error message is not found.
+
+If ALE is not showing any errors but your file does not run as expected, run
+`fish -n <file.fish>` from the command line.
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -64,6 +64,7 @@ CONTENTS                                                         *ale-contents*
       erlc................................|ale-erlang-erlc|
       syntaxerl...........................|ale-erlang-syntaxerl|
     eruby.................................|ale-eruby-options|
+    fish..................................|ale-fish-options|
     fortran...............................|ale-fortran-options|
       gcc.................................|ale-fortran-gcc|
     fountain..............................|ale-fountain-options|
@@ -301,6 +302,7 @@ Notes:
 * Elm: `elm-format, elm-make`
 * Erb: `erb`, `erubis`
 * Erlang: `erlc`, `SyntaxErl`
+* Fish: `fish` (-n flag)
 * Fortran: `gcc`
 * Fountain: `proselint`
 * FusionScript: `fusion-lint`