feat!: drop modules, general refactor and cleanup

runtime/queries/fish/folds.scm

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+[
+  (function_definition)
+  (if_statement)
+  (switch_statement)
+  (for_statement)
+  (while_statement)
+  (begin_statement)
+] @fold

runtime/queries/fish/highlights.scm

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+; Fish highlighting
+; Operators
+[
+  "&&"
+  "||"
+  "|"
+  "&|"
+  "2>|"
+  "&"
+  ".."
+  "!"
+  (direction)
+  (stream_redirect)
+] @operator
+
+; match operators of test command
+(command
+  name: (word) @function.builtin
+  (#eq? @function.builtin "test")
+  argument: (word) @operator
+  (#match? @operator "^(!?\\=|-[a-zA-Z]+)$"))
+
+; match operators of [ command
+(command
+  name: (word) @punctuation.bracket
+  (#eq? @punctuation.bracket "[")
+  argument: (word) @operator
+  (#match? @operator "^(!?\\=|-[a-zA-Z]+)$"))
+
+[
+  "not"
+  "and"
+  "or"
+] @keyword.operator
+
+; Conditionals
+(if_statement
+  [
+    "if"
+    "end"
+  ] @keyword.conditional)
+
+(switch_statement
+  [
+    "switch"
+    "end"
+  ] @keyword.conditional)
+
+(case_clause
+  "case" @keyword.conditional)
+
+(else_clause
+  "else" @keyword.conditional)
+
+(else_if_clause
+  [
+    "else"
+    "if"
+  ] @keyword.conditional)
+
+; Loops/Blocks
+(while_statement
+  [
+    "while"
+    "end"
+  ] @keyword.repeat)
+
+(for_statement
+  [
+    "for"
+    "end"
+  ] @keyword.repeat)
+
+(begin_statement
+  [
+    "begin"
+    "end"
+  ] @keyword.repeat)
+
+; Keywords
+[
+  "in"
+  (break)
+  (continue)
+] @keyword
+
+"return" @keyword.return
+
+; Punctuation
+[
+  "["
+  "]"
+  "{"
+  "}"
+  "("
+  ")"
+] @punctuation.bracket
+
+"," @punctuation.delimiter
+
+; Commands
+(command
+  argument: [
+    (word) @variable.parameter
+    (#lua-match? @variable.parameter "^[-]")
+  ])
+
+(command_substitution
+  "$" @punctuation.special)
+
+; non-builtin command names
+(command
+  name: (word) @function.call)
+
+; derived from builtin -n (fish 3.2.2)
+(command
+  name: [
+    (word) @function.builtin
+    (#any-of? @function.builtin
+      "." ":" "_" "alias" "argparse" "bg" "bind" "block" "breakpoint" "builtin" "cd" "command"
+      "commandline" "complete" "contains" "count" "disown" "echo" "emit" "eval" "exec" "exit" "fg"
+      "functions" "history" "isatty" "jobs" "math" "printf" "pwd" "random" "read" "realpath" "set"
+      "set_color" "source" "status" "string" "test" "time" "type" "ulimit" "wait")
+  ])
+
+; Functions
+(function_definition
+  [
+    "function"
+    "end"
+  ] @keyword.function)
+
+(function_definition
+  name: [
+    (word)
+    (concatenation)
+  ] @function)
+
+(function_definition
+  option: [
+    (word)
+    (concatenation
+      (word))
+  ] @variable.parameter
+  (#lua-match? @variable.parameter "^[-]"))
+
+; Strings
+[
+  (double_quote_string)
+  (single_quote_string)
+] @string
+
+(escape_sequence) @string.escape
+
+; Variables
+(variable_name) @variable
+
+(variable_expansion) @constant
+
+(variable_expansion
+  "$" @punctuation.special) @none
+
+; Reference: https://fishshell.com/docs/current/language.html#special-variables
+((variable_name) @variable.builtin
+  (#any-of? @variable.builtin
+    "PATH" "CDPATH" "LANG" "LC_ALL" "LC_COLLATE" "LC_CTYPE" "LC_MESSAGES" "LC_MONETARY" "LC_NUMERIC"
+    "LC_TIME" "fish_color_normal" "fish_color_command" "fish_color_keyword" "fish_color_keyword"
+    "fish_color_redirection" "fish_color_end" "fish_color_error" "fish_color_param"
+    "fish_color_valid_path" "fish_color_option" "fish_color_comment" "fish_color_selection"
+    "fish_color_operator" "fish_color_escape" "fish_color_autosuggestion" "fish_color_cwd"
+    "fish_color_cwd_root" "fish_color_user" "fish_color_host" "fish_color_host_remote"
+    "fish_color_status" "fish_color_cancel" "fish_color_search_match" "fish_color_history_current"
+    "fish_pager_color_progress" "fish_pager_color_background" "fish_pager_color_prefix"
+    "fish_pager_color_completion" "fish_pager_color_description"
+    "fish_pager_color_selected_background" "fish_pager_color_selected_prefix"
+    "fish_pager_color_selected_completion" "fish_pager_color_selected_description"
+    "fish_pager_color_secondary_background" "fish_pager_color_secondary_prefix"
+    "fish_pager_color_secondary_completion" "fish_pager_color_secondary_description"
+    "fish_term24bit" "fish_term256" "fish_ambiguous_width" "fish_emoji_width"
+    "fish_autosuggestion_enabled" "fish_handle_reflow" "fish_key_bindings" "fish_escape_delay_ms"
+    "fish_sequence_key_delay_ms" "fish_complete_path" "fish_cursor_selection_mode"
+    "fish_function_path" "fish_greeting" "fish_history" "fish_trace" "FISH_DEBUG"
+    "FISH_DEBUG_OUTPUT" "fish_user_paths" "umask" "BROWSER" "_" "argv" "CMD_DURATION" "COLUMNS"
+    "LINES" "fish_kill_signal" "fish_killring" "fish_read_limit" "fish_pid" "history" "HOME"
+    "hostname" "IFS" "last_pid" "PWD" "pipestatus" "SHLVL" "status" "status_generation" "TERM"
+    "USER" "EUID" "version" "FISH_VERSION"))
+
+; Nodes
+[
+  (integer)
+  (float)
+] @number
+
+(comment) @comment
+
+(comment) @spell
+
+((word) @boolean
+  (#any-of? @boolean "true" "false"))
+
+((program
+  .
+  (comment) @keyword.directive @nospell)
+  (#lua-match? @keyword.directive "^#!/"))

runtime/queries/fish/indents.scm

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+[
+  (function_definition)
+  (while_statement)
+  (for_statement)
+  (if_statement)
+  (begin_statement)
+  (switch_statement)
+] @indent.begin
+
+[
+  "else" ; else and else if must both start the line with "else", so tag the string directly
+  "case"
+  "end"
+] @indent.branch
+
+"end" @indent.end
+
+(comment) @indent.ignore

runtime/queries/fish/injections.scm

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+((comment) @injection.content
+  (#set! injection.language "comment"))

runtime/queries/fish/locals.scm

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+; Scopes
+[
+  (command)
+  (function_definition)
+  (if_statement)
+  (for_statement)
+  (begin_statement)
+  (while_statement)
+  (switch_statement)
+] @local.scope
+
+; Definitions
+(function_definition
+  name: (word) @local.definition.function)
+
+; References
+(variable_name) @local.reference
+
+(word) @local.reference