Add a linter for alex

https://github.com/wooorm/alex

Enabled for text-like file formats and documented in README and doc.

ale_linters/asciidoc/alex.vim

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+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for asciidoc files
+
+call ale#linter#Define('asciidoc', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/help/alex.vim

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+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for help files
+
+call ale#linter#Define('help', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/html/alex.vim

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+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for HTML files
+
+call ale#linter#Define('html', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/mail/alex.vim

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+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for HTML files
+
+call ale#linter#Define('mail', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/markdown/alex.vim

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+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for markdown files
+
+call ale#linter#Define('markdown', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/nroff/alex.vim

@@ -0,0 +1,10 @@
+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for nroff files
+
+call ale#linter#Define('nroff', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/pod/alex.vim

@@ -0,0 +1,10 @@
+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for pod files
+
+call ale#linter#Define('pod', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/rst/alex.vim

@@ -0,0 +1,10 @@
+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for rst files
+
+call ale#linter#Define('rst', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/tex/alex.vim

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+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for TeX files
+
+call ale#linter#Define('tex', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/texinfo/alex.vim

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+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for texinfo files
+
+call ale#linter#Define('texinfo', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/text/alex.vim

@@ -0,0 +1,10 @@
+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for text files
+
+call ale#linter#Define('text', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})

ale_linters/xhtml/alex.vim

@@ -0,0 +1,10 @@
+" Author: Johannes Wienke <languitar@semipol.de>
+" Description: alex for XHTML files
+
+call ale#linter#Define('xhtml', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %t -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\})