feat(promql,yaml): add parser and yaml injections

Signed-off-by: Michael Hoffmann <mhoffm@posteo.de>

queries/promql/highlights.scm

@@ -0,0 +1,54 @@
+; highlights.scm
+
+[
+  "*"
+  "/"
+  "%"
+  "+"
+  "-"
+  ">"
+  ">="
+  "<"
+  "<="
+  "="
+  "=~"
+  "!="
+  "!~"
+] @operator
+
+[
+  "and"
+  "unless"
+  "or"
+  "bool"
+] @keyword.operator
+
+[
+  "{"
+  "}"
+  "["
+  "]"
+  "("
+  ")"
+] @punctuation.bracket
+
+(float_literal) @float
+(string_literal) @string
+
+(metric_name) @type
+(range_selection) @text.strong @type
+(subquery_range_selection) @text.strong @type
+
+(label_name) @field
+(label_value) @text.underline @string.regex
+
+(function_name) @function.call
+
+[ 
+  "by"
+  "without"
+] @function
+
+(comment) @comment @spell
+(ERROR) @error
+

queries/promql/injections.scm

@@ -0,0 +1 @@
+((label_value) @regex (#offset! @regex 0 1 0 -1))

queries/yaml/injections.scm

@@ -25,3 +25,29 @@
              (block_sequence_item
                (block_node
                   (block_scalar) @bash (#offset! @bash 0 1 0 0))))))
+
+;; Prometheus Alertmanager ("expr")
+(block_mapping_pair
+  key: (flow_node) @_expr (#eq? @_expr "expr")
+  value: (flow_node
+           (plain_scalar) @promql))
+
+(block_mapping_pair
+  key: (flow_node) @_expr (#eq? @_expr "expr")
+  value: (block_node
+           (block_scalar) @promql (#offset! @promql 0 2 0 0)))
+
+(block_mapping_pair
+  key: (flow_node) @_expr (#eq? @_expr "expr")
+  value: (block_node
+           (block_sequence
+             (block_sequence_item
+               (flow_node) @promql))))
+
+(block_mapping_pair
+  key: (flow_node) @_expr (#eq @_expr "expr")
+  value: (block_node
+           (block_sequence
+             (block_sequence_item
+               (block_node
+                  (block_scalar) @promql (#offset! @promql 0 2 0 0))))))