[Go] syntax rework

  * Contextual types. Types are scoped where types are expected. There's no whitelist of "known" types.

  * Better understands the language and its syntax. Better at handling whitespace and comments inside complex forms. Better at handling other nuances. Unlikely to be confused by unusual code style.

  * Vars and consts in the root scope are added to the symbol index and searchable by ⌘R, ⌘⇪R, and `goto_definition`.

  * Supports parenthesized `type (...)` groups, not just `const (...)` and `var (...)`.

  * The first argument to `new` and `make` is scoped as a type.

  * Methods declared inside an `interface` are added to the symbol index, reflecting the fact that they actually exist as functions.

  * Supports embedded structs.

  * Supports inherited interfaces.

  * Supports imaginary number literals.

  * Variable declarations are scoped differently from other variable occurrences.

  * `iota` is scoped only in constant initialization expressions.

  * Symbols in ⌘R are annotated with their origin: `var`, `const`, `type` or `func`.

  * Auto-pairing of backticks.

  * Much more comprehensive tests.

  * All keywords and predeclared identifiers are added to auto-completions by default.

  * Better snippets that don't mess with auto-completion.

  * Slightly better indentation rules that more closely match `gofmt`.

Current shortcomings (?):

  * Fewer meta scopes: needs feedback.

  * No support for block labels: needs feedback.

Go/Default.sublime-keymap

@@ -0,0 +1,45 @@
+[
+  // Auto-pair backquotes. Partially copied from the default Sublime keymap,
+  // with some modifications.
+  { "keys": ["`"], "command": "insert_snippet", "args": {"contents": "`$0`"}, "context":
+    [
+      { "key": "selector", "operator": "equal", "operand": "source.go", },
+      { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
+      { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
+      { "key": "preceding_text", "operator": "regex_contains", "operand": "(?:^|\\s)$", "match_all": true },
+      { "key": "following_text", "operator": "regex_contains", "operand": "^(?:\\s|$)", "match_all": true },
+    ]
+  },
+  { "keys": ["`"], "command": "insert_snippet", "args": {"contents": "`${0:$SELECTION}`"}, "context":
+    [
+      { "key": "selector", "operator": "equal", "operand": "source.go", },
+      { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
+      { "key": "selection_empty", "operator": "equal", "operand": false, "match_all": true },
+    ]
+  },
+  { "keys": ["`"], "command": "move", "args": {"by": "characters", "forward": true}, "context":
+    [
+      { "key": "selector", "operator": "equal", "operand": "source.go", },
+      { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
+      { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
+      { "key": "following_text", "operator": "regex_contains", "operand": "^`", "match_all": true },
+    ]
+  },
+  { "keys": ["backspace"], "command": "run_macro_file", "args": {"file": "res://Packages/Default/Delete Left Right.sublime-macro"}, "context":
+    [
+      { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
+      { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
+      { "key": "preceding_text", "operator": "regex_contains", "operand": "`$", "match_all": true },
+      { "key": "following_text", "operator": "regex_contains", "operand": "^`", "match_all": true },
+    ]
+  },
+
+  { "keys": ["enter"], "command": "run_macro_file", "args": {"file": "res://Packages/Default/Add Line in Braces.sublime-macro"}, "context":
+    [
+      { "key": "setting.auto_indent", "operator": "equal", "operand": true },
+      { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
+      { "key": "preceding_text", "operator": "regex_contains", "operand": "\\($", "match_all": true },
+      { "key": "following_text", "operator": "regex_contains", "operand": "^\\)", "match_all": true }
+    ]
+  },
+]

Go/Go.sublime-completions

@@ -0,0 +1,71 @@
+{
+  "scope": "source.go",
+
+  "completions": [
+    // https://golang.org/ref/spec#Keywords
+    "break",
+    "default",
+    "func",
+    "interface",
+    "select",
+    "case",
+    "defer",
+    "go",
+    "map",
+    "struct",
+    "chan",
+    "else",
+    "goto",
+    "package",
+    "switch",
+    "const",
+    "fallthrough",
+    "if",
+    "range",
+    "type",
+    "continue",
+    "for",
+    "import",
+    "return",
+    "var",
+
+    // https://golang.org/ref/spec#Predeclared_identifiers
+    "bool",
+    "byte",
+    "complex64",
+    "complex128",
+    "error",
+    "float32",
+    "float64",
+    "int",
+    "int8",
+    "int16",
+    "int32",
+    "int64",
+    "rune",
+    "string",
+    "uint",
+    "uint8",
+    "uint16",
+    "uint32",
+    "uint64",
+    "uintptr",
+    "true",
+    "false",
+    "iota",
+    "nil",
+    "append",
+    "cap",
+    "close",
+    "complex",
+    "copy",
+    "delete",
+    "imag",
+    "len",
+    "make",
+    "new",
+    "panic",
+    "real",
+    "recover",
+  ],
+}

Go/Go.sublime-settings

@@ -0,0 +1,11 @@
+{
+  // Prefer tabs because gofmt enforces tabs.
+  "translate_tabs_to_spaces": false,
+  // Trigger autocompletion on dot access.
+  "auto_complete_triggers": [
+    {
+      "characters": ".",
+      "selector": "source.go",
+    },
+  ],
+}