ENH Basic syntax highlighting for ngl files

Author: luispedro

README.md

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+# Vim plugin for editing ngless files
+
+Currently adds syntax highlighting for
+[ngless](http://luispedro.github.io/ngless/).
+
+This is compatible with [vundle](https://github.com/VundleVim/Vundle.vim), so
+you should be able to just add the following line to your '.vimrc' file:
+
+    Plugin 'luispedro/vim-ngless'

ftdetect/ngless.vim

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+au BufRead,BufNewFile *.ngl        set filetype=ngl syntax=ngl

syntax/ngl.vim

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+" Vim syntax file
+" Language: ngl
+" Maintainer:  Luis Pedro Coelho <[email protected]>
+
+syn case ignore
+
+syn keyword nglKeyword ngless fastq preprocess map write count annotate
+syn keyword nglOperator ? : == != > >= < <= + - % * /
+
+syn match nglFunction "\<[a-zA-Z][a-zA-Z0-9_]*\s*(" contains=nglFunctionName
+
+syn region nglString        start=+"+  skip=+\\\\\|\\"+  end=+"+
+syn region nglString        start=+'+  skip=+\\\\\|\\'+  end=+'+
+syn region nglString        start=+`+  skip=+\\\\\|\\`+  end=+`+
+
+syn match nglSymbol "{[a-zA-Z0-9_]\+}"
+
+" Numbers:
+syn match  nglNumber "[-+]\=\(\<\d[[:digit:]_]*L\=\>\|0[xX]\x[[:xdigit:]_]*\>\)"
+syn match  nglFloat  "[-+]\=\<\d[[:digit:]_]*[eE][\-+]\=\d\+"
+syn match  nglFloat  "[-+]\=\<\d[[:digit:]_]*\.[[:digit:]_]*\([eE][\-+]\=\d\+\)\="
+syn match  nglFloat  "[-+]\=\<\.[[:digit:]_]\+\([eE][\-+]\=\d\+\)\="
+
+" Comments:
+syn region nglComment start="/\*" end="\*/" contains=nglTodo
+syn match nglComment "//.*$" contains=nglTodo
+syn match nglComment "#.*$" contains=nglTodo
+syn sync ccomment nglComment
+
+" Todo.
+syn keyword nglTodo TODO FIXME XXX DEBUG NOTE contained
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_c_syn_inits")
+  if version < 508
+    let did_c_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  HiLink nglComment     Comment
+  HiLink nglOpWord      Label
+  HiLink nglOperator    Operator
+  HiLink nglType        Type
+  HiLink nglSpecial     Special
+  HiLink nglKeyword     Statement
+  HiLink nglNumber      Number
+  HiLink nglFloat       Float
+  HiLink nglSymbol      Constant
+  HiLink nglAssignVar   Identifier
+  HiLink nglString      String
+  HiLink nglTodo        Todo
+
+  HiLink nglFunctionName Function
+
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "ngl"
+