Merge pull request #1429 from stewy33/master

Add support for Mercury language using mmc as a linter.

doc/ale-mercury.txt

@@ -0,0 +1,26 @@
+===============================================================================
+ALE Mercury Integration                                   *ale-mercury-options*
+
+
+===============================================================================
+mmc                                                           *ale-mercury-mmc*
+
+
+g:ale_mercury_mmc_executable                     *g:ale_mercury_mmc_executable*
+                                                 *b:ale_mercury_mmc_executable*
+  Type: |String|
+  Default: `'mmc'`
+
+  This variable can be changed to use a different executable for mmc.
+
+
+g:ale_mercury_mmc_options                           *g:ale_mercury_mmc_options*
+                                                    *b:ale_mercury_mmc_options*
+  Type: |String|
+  Default: `'--make --output-compile-error-lines 100'`
+
+  This variable can be set to pass additional options to mmc.
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -141,6 +141,8 @@ CONTENTS                                                         *ale-contents*
       prettier............................|ale-markdown-prettier|
       textlint............................|ale-markdown-textlint|
       write-good..........................|ale-markdown-write-good|
+    mercury...............................|ale-mercury-options|
+      mmc.................................|ale-mercury-mmc|
     nroff.................................|ale-nroff-options|
       write-good..........................|ale-nroff-write-good|
     objc..................................|ale-objc-options|
@@ -350,6 +352,7 @@ Notes:
 * Make: `checkmake`
 * Markdown: `alex`!!, `markdownlint`!!, `mdl`, `prettier`, `proselint`, `redpen`, `remark-lint`, `textlint`, `vale`, `write-good`
 * MATLAB: `mlint`
+* Mercury: `mmc`!!
 * Nim: `nim check`!!
 * nix: `nix-instantiate`
 * nroff: `alex`!!, `proselint`, `write-good`