Add `language_awk` (#461)

* Add `language_awk`

* Update manifest.json to include language awk

* Remove "case" from `language_awk.lua`

I forgot to delete this when copying the symbols, I left it in place because it was used as reference for how the "=" should be spaced.

* Update `language_awk`, remove new line from pattern

* Update manifest.json, fix id for `language_awk`

* Simplify sheabang pattern in `language_awk`

* Update pattern in `language_awk`

* Update pattern in `language_awk`

* Update pattern in `language_awk`

* Update pattern in `language_awk`

* Update pattern in `language_awk`

* Add more symbols to `language_awk`

1 files changed, 110 insertions, 0 deletions

diff --git a/plugins/language_awk.lua b/plugins/language_awk.lua
new file mode 100644
index 0000000..cc56335
--- /dev/null
+++ b/plugins/language_awk.lua
@@ -0,0 +1,110 @@
+-- mod-version:3
+local syntax = require "core.syntax"
+
+syntax.add {
+  name = "Awk script",
+  files = "%.awk$",
+  headers = "^#!.*bin.*awk",
+  comment = "#",
+  patterns = {
+    -- $# is a awk special variable and the '#' shouldn't be interpreted
+    -- as a comment.
+    { pattern = "%$[%a_@*#][%w_]*",               type = "keyword2" },
+    -- Comments
+    { pattern = "#.*",                            type = "comment"  },
+    -- Strings
+    { pattern = { '"', '"', '\\' },               type = "string"   },
+    { pattern = { "'", "'", '\\' },               type = "string"   },
+    { pattern = { '`', '`', '\\' },               type = "string"   },
+    -- Ignore numbers that start with dots or slashes
+    { pattern = "%f[%w_%.%/]%d[%d%.]*%f[^%w_%.]", type = "number"   },
+    -- Operators
+    { pattern = "[!<>|&%[%]:=*]",                 type = "operator" },
+    -- Match parameters
+    { pattern = "%f[%S][%+%-][%w%-_:]+",          type = "function" },
+    { pattern = "%f[%S][%+%-][%w%-_]+%f[=]",      type = "function" },
+    -- Prevent parameters with assignments from been matched as variables
+    {
+      pattern = "%s%-%a[%w_%-]*()%s+()%d[%d%.]+",
+      type = { "function", "normal", "number" }
+    },
+    {
+      pattern = "%s%-%a[%w_%-]*()%s+()%a[%a%-_:=]+",
+      type = { "function", "normal", "symbol" }
+    },
+    -- Match variable assignments
+    { pattern = "[_%a][%w_]+%f[%+=]",              type = "keyword2" },
+    -- Match variable expansions
+    { pattern = "%${.-}",                          type = "keyword2" },
+    { pattern = "%$[%d%$%a_@*][%w_]*",             type = "keyword2" },
+    -- Functions
+    { pattern = "[%a_%-][%w_%-]*()%s*%f[(]",       type = { "function", "normal" } },
+    -- Everything else
+    { pattern = "[%a_][%w_]*",                     type = "symbol"   },
+  },
+  symbols = {
+    ["break"]       = "keyword",
+    ["continue"]    = "keyword",
+    ["do"]          = "keyword",
+    ["delete"]      = "keyword",
+    ["else"]        = "keyword",
+    ["exit"]        = "keyword",
+    ["for"]         = "keyword",
+    ["function"]    = "keyword",
+    ["getline"]     = "keyword",
+    ["if"]          = "keyword",
+    ["next"]        = "keyword",
+    ["nextfile"]    = "keyword",
+    ["print"]       = "keyword",
+    ["printf"]      = "keyword",
+    ["return"]      = "keyword",
+    ["while"]       = "keyword",
+    ["gsub"]        = "keyword",
+    ["index"]       = "keyword",
+    ["length"]      = "keyword",
+    ["match"]       = "keyword",
+    ["split"]       = "keyword",
+    ["sprintf"]     = "keyword",
+    ["sub"]         = "keyword",
+    ["substr"]      = "keyword",
+    ["tolower"]     = "keyword",
+    ["toupper"]     = "keyword",
+    ["atan2"]       = "keyword",
+    ["cos"]         = "keyword",
+    ["exp"]         = "keyword",
+    ["int"]         = "keyword",
+    ["log"]         = "keyword",
+    ["rand"]        = "keyword",
+    ["sin"]         = "keyword",
+    ["sqrt"]        = "keyword",
+    ["srand"]       = "keyword",
+    ["BEGIN"]       = "keyword",
+    ["END"]         = "keyword",
+    ["ARGC"]        = "keyword",
+    ["ARGV"]        = "keyword",
+    ["FILENAME"]    = "keyword",
+    ["FNR"]         = "keyword",
+    ["FS"]          = "keyword",
+    ["NF"]          = "keyword",
+    ["NR"]          = "keyword",
+    ["OFMT"]        = "keyword",
+    ["OFS"]         = "keyword",
+    ["ORS"]         = "keyword",
+    ["RLENGTH"]     = "keyword",
+    ["RS"]          = "keyword",
+    ["RSTART"]      = "keyword",
+    ["SUBSEP"]      = "keyword",
+    ["ARGIND"]      = "keyword",
+    ["BINMODE"]     = "keyword",
+    ["CONVFMT"]     = "keyword",
+    ["ENVIRON"]     = "keyword",
+    ["ERRNO"]       = "keyword",
+    ["FIELDWIDTHS"] = "keyword",
+    ["IGNORECASE"]  = "keyword",
+    ["LINT"]        = "keyword",
+    ["PROCINFO"]    = "keyword",
+    ["RT"]          = "keyword",
+    ["RLENGTH"]     = "keyword",
+    ["TEXTDOMAIN"]  = "keyword"
+  }
+}