add gitignore-aware file filtering for LSP completions and code actions

Files matching .gitignore patterns or user-configured extra patterns are
now skipped for completions and code actions. Configurable via [ignore]
section in config.toml with gitignore, extra_patterns, and
lsp_notify_ignored options. Includes hot-reload support and env var
overrides (HEXAI_IGNORE_*).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/internal/lsp/handlers_ignore.go b/internal/lsp/handlers_ignore.go
new file mode 100644
index 0000000..bbd2dfa
--- /dev/null
+++ b/internal/lsp/handlers_ignore.go
@@ -0,0 +1,41 @@
+// Summary: Helpers for gitignore-aware file filtering in LSP handlers.
+package lsp
+
+import (
+	"net/url"
+	"strings"
+)
+
+// isFileIgnored checks whether the file at the given LSP URI should be ignored.
+// Returns false when no ignore checker is configured.
+func (s *Server) isFileIgnored(uri string) (bool, string) {
+	if s.ignoreChecker == nil {
+		return false, ""
+	}
+	absPath := uriToPath(uri)
+	if absPath == "" {
+		return false, ""
+	}
+	return s.ignoreChecker.IsIgnored(absPath)
+}
+
+// ignoreLSPNotifyEnabled returns whether to show "file ignored" completion items
+// when a file is ignored. Reads from the IgnoreLSPNotify config field.
+func (s *Server) ignoreLSPNotifyEnabled() bool {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return s.cfg.IgnoreLSPNotify == nil || *s.cfg.IgnoreLSPNotify
+}
+
+// uriToPath converts a file:// URI to an absolute file path.
+// Returns empty string for non-file URIs.
+func uriToPath(uri string) string {
+	if !strings.HasPrefix(uri, "file://") {
+		return ""
+	}
+	parsed, err := url.Parse(uri)
+	if err != nil {
+		return ""
+	}
+	return parsed.Path
+}