filter: tokenize query to support quoted terms

filter.go

@@ -4,9 +4,52 @@ import (
 	"strings"
 )
 
+func tokenizeFilterQuery(query string) []string {
+	tokens := []string{}
+	var currentToken string
+	var inQuotes bool
+	var quoteChar rune
+
+	for i := 0; i < len(query); i++ {
+		c := rune(query[i])
+
+		// If we're not in quotes and encounter a quote, we enter 'quote mode'
+		if !inQuotes && (c == '"' || c == '\'') {
+			inQuotes = true
+			quoteChar = c
+			continue
+		}
+
+		// If we are in quotes and encounter the same quoteChar, we exit 'quote mode'
+		if inQuotes && c == quoteChar {
+			inQuotes = false
+			continue
+		}
+
+		// If we're not in quotes and see a space, that's a token boundary
+		if !inQuotes && c == ' ' {
+			if currentToken != "" {
+				tokens = append(tokens, currentToken)
+				currentToken = ""
+			}
+			continue
+		}
+
+		// Otherwise, accumulate the character
+		currentToken += string(c)
+	}
+
+	// Append the last token if non-empty
+	if currentToken != "" {
+		tokens = append(tokens, currentToken)
+	}
+
+	return tokens
+}
+
 func evaluateFilterQuery(query string, input string) (bool, error) {
 	input = strings.ToLower(input)
-	tokens := strings.Fields(strings.ToLower(query))
+	tokens := tokenizeFilterQuery(strings.ToLower(query))
 	matches := true
 
 	for _, token := range tokens {

tests/lines.bats

@@ -77,3 +77,16 @@ setup_file() {
     [ "${#lines[@]}" -eq 1 ]
     assert_line "64214a1d.md:5: richard feynman [quantum mechanics](64214930.md), the theory of quantum electrodynamics,"
 }
+
+@test "lines: filter quoted vs non-quoted" {
+    run notesium lines --filter='theory of quantum'
+    [ $status -eq 0 ]
+    [ "${#lines[@]}" -eq 2 ]
+    assert_line "64214a1d.md:5: [quantum mechanics](64214930.md), the theory of quantum electrodynamics,"
+    assert_line "64218088.md:7: to the development of the theory of [quantum mechanics](64214930.md)."
+
+    run notesium lines --filter='"theory of quantum"'
+    [ $status -eq 0 ]
+    [ "${#lines[@]}" -eq 1 ]
+    assert_line "64214a1d.md:5: [quantum mechanics](64214930.md), the theory of quantum electrodynamics,"
+}