chore: import upstream snapshot with attribution

internal/parser/languages/vim.go

@@ -0,0 +1,92 @@
+package languages
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/zzet/gortex/internal/graph"
+	"github.com/zzet/gortex/internal/parser"
+)
+
+// VimScript. Functions use abbreviated forms (`fu`, `func`, `function`),
+// may include `!` for override, and scope prefixes like `s:`, `g:`,
+// `<SID>`. `let` defines variables; `source` pulls in files; `command`
+// defines user commands.
+var (
+	vimFunctionRe = regexp.MustCompile(`(?im)^\s*fu(?:n|nc|nction)?!?\s+(?:s:|g:|b:|l:|<[sS][iI][dD]>)?([\w#]+)`)
+	vimLetRe      = regexp.MustCompile(`(?im)^\s*let\s+(?:s:|g:|b:|l:|w:|t:)?(\w+)`)
+	vimSourceRe   = regexp.MustCompile(`(?im)^\s*so(?:urce|u)?\s+(\S+)`)
+	vimCommandRe  = regexp.MustCompile(`(?im)^\s*com(?:m|mand)?!?\s+(?:-\S+\s+)*(\w+)`)
+)
+
+// VimExtractor extracts VimScript source using regex.
+type VimExtractor struct{}
+
+func NewVimExtractor() *VimExtractor { return &VimExtractor{} }
+
+func (e *VimExtractor) Language() string { return "vim" }
+func (e *VimExtractor) Extensions() []string {
+	return []string{".vim", ".vimrc", ".gvimrc", ".nvim"}
+}
+
+func (e *VimExtractor) Extract(filePath string, src []byte) (*parser.ExtractionResult, error) {
+	lines := strings.Split(string(src), "\n")
+	result := &parser.ExtractionResult{}
+
+	fileNode := &graph.Node{
+		ID: filePath, Kind: graph.KindFile, Name: filePath,
+		FilePath: filePath, StartLine: 1, EndLine: len(lines),
+		Language: "vim",
+	}
+	result.Nodes = append(result.Nodes, fileNode)
+
+	seen := make(map[string]bool)
+	add := func(name string, kind graph.NodeKind, start, end int) {
+		if name == "" {
+			return
+		}
+		id := filePath + "::" + name
+		if seen[id] {
+			return
+		}
+		seen[id] = true
+		result.Nodes = append(result.Nodes, &graph.Node{
+			ID: id, Kind: kind, Name: name,
+			FilePath: filePath, StartLine: start, EndLine: end,
+			Language: "vim",
+		})
+		result.Edges = append(result.Edges, &graph.Edge{
+			From: fileNode.ID, To: id, Kind: graph.EdgeDefines,
+			FilePath: filePath, Line: start,
+		})
+	}
+
+	for _, m := range vimFunctionRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindFunction, line, findKeywordBlockEnd(lines, line, "endfunction", "endfun", "endf"))
+	}
+	for _, m := range vimLetRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindVariable, line, line)
+	}
+	for _, m := range vimCommandRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindFunction, line, line)
+	}
+
+	for _, m := range vimSourceRe.FindAllSubmatchIndex(src, -1) {
+		path := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		result.Edges = append(result.Edges, &graph.Edge{
+			From: fileNode.ID, To: "unresolved::import::" + path,
+			Kind: graph.EdgeImports, FilePath: filePath, Line: line,
+		})
+	}
+
+	return result, nil
+}
+
+var _ parser.Extractor = (*VimExtractor)(nil)