feat: Add Dockerfile support (#221)

Author: jcs090218

.gitmodules

@@ -322,3 +322,9 @@
 	branch = master
 	update = none
 	ignore = dirty
+[submodule "repos/dockerfile"]
+	path = repos/dockerfile
+	url = https://github.com/camdencheek/tree-sitter-dockerfile
+	branch = main
+	update = none
+	ignore = dirty

queries/dockerfile/highlights.scm

@@ -0,0 +1,63 @@
+[
+  "FROM"
+  "AS"
+  "RUN"
+  "CMD"
+  "LABEL"
+  "EXPOSE"
+  "ENV"
+  "ADD"
+  "COPY"
+  "ENTRYPOINT"
+  "VOLUME"
+  "USER"
+  "WORKDIR"
+  "ARG"
+  "ONBUILD"
+  "STOPSIGNAL"
+  "HEALTHCHECK"
+  "SHELL"
+  "MAINTAINER"
+  "CROSS_BUILD"
+] @keyword
+
+[
+  ":"
+  "@"
+] @operator
+
+(comment) @comment @spell
+
+(image_spec
+  (image_tag
+    ":" @punctuation.special)
+  (image_digest
+    "@" @punctuation.special))
+
+(double_quoted_string) @string
+
+(expansion
+  [
+    "$"
+    "{"
+    "}"
+  ] @punctuation.special
+)
+
+((variable) @constant
+  (#match? @constant "^[A-Z][A-Z_0-9]*$"))
+
+(arg_instruction
+  . (unquoted_string) @property)
+
+(env_instruction
+  (env_pair . (unquoted_string) @property))
+
+(expose_instruction
+  (expose_port) @number)
+
+((stopsignal_instruction) @number
+  (#match? @number "[0-9][0-9]?$"))
+
+((stopsignal_instruction) @constant.builtin
+  (#match? @constant.builtin "SIG(ABRT|HUP|INT|KILL|QUIT|STOP|TERM|TSTP)$"))

repos/dockerfile

@@ -109,6 +109,7 @@ See `tree-sitter-langs-repos'."
                 (c++-mode        . cpp)
                 (d-mode          . d)
                 (dart-mode       . dart)
+                (dockerfile-mode . dockerfile)
                 (css-mode        . css)
                 (elm-mode        . elm)
                 (elixir-mode     . elixir)