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feat(help): Implement full-text search (#294)

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* feat(help): implement full-text search with highlighting

- Implemented inverted index for help topics and sections.
- Added weighted scoring: Title (10.0), Section (5.0), Content (1.0).
- Implemented snippet extraction with robust markdown highlighting.
- Added comprehensive tests for search accuracy and highlighting.

* feat(help): implement full-text search with highlighting

- Implemented inverted index for help topics and sections.
- Added weighted scoring: Title (10.0), Section (5.0), Content (1.0).
- Implemented snippet extraction with robust markdown highlighting.
- Added comprehensive tests for search accuracy and highlighting.

* feat(help): implement full-text search with highlighting

- Implemented inverted index for help topics and sections.
- Added weighted scoring: Title (10.0), Section (5.0), Content (1.0).
- Implemented snippet extraction with robust markdown highlighting.
- Added comprehensive tests for search accuracy and highlighting.

* feat(help): implement full-text search with ranking and highlighting

- Implemented inverted index for help topics and sections.
- Added weighted scoring: Title (10.0), Section (5.0), Content (1.0).
- Implemented snippet extraction with markdown bold highlighting.
- Optimized search by pre-compiling regexes for match finding.
- Updated CLI help command to display matched sections and snippets with ANSI bold.
- Added comprehensive tests for search accuracy and highlighting.

* feat(help): implement full-text search with ranking and highlighting

- Implemented inverted index for help topics and sections.
- Added weighted scoring: Title (10.0), Section (5.0), Content (1.0).
- Implemented snippet extraction with robust markdown highlighting.
- Optimized performance by pre-compiling regexes for match finding.
- Updated CLI help command to display matched sections and snippets with ANSI bold.
- Added comprehensive tests for search accuracy and highlighting.
- Fixed missing `strings` import in `internal/cmd/help/cmd.go`.

* feat(help): implement full-text search with ranking and highlighting

- Implemented inverted index for help topics and sections.
- Added weighted scoring: Title (10.0), Section (5.0), Content (1.0).
- Implemented snippet extraction with robust markdown highlighting.
- Optimized performance by pre-compiling regexes for match finding.
- Updated CLI help command to display matched sections and snippets with ANSI bold.
- Added comprehensive tests for search accuracy and highlighting.
- Fixed missing `strings` import in `internal/cmd/help/cmd.go`.
- Ensured all project files are correctly formatted.

* feat(help): implement full-text search with ranking and highlighting

- Implemented inverted index for help topics and sections as specified.
- Added weighted scoring: Title (10.0), Section (5.0), Content (1.0).
- Implemented snippet extraction with robust markdown highlighting.
- Optimized performance by pre-compiling regexes for match finding.
- Updated CLI help command to display matched sections and snippets with ANSI bold.
- Added comprehensive tests for search accuracy and highlighting.
- Fixed missing `strings` import in `internal/cmd/help/cmd.go`.
- Verified that `tokenize` is correctly defined and used within `pkg/help`.

* feat(help): implement full-text search with ranking and highlighting

- Implemented inverted index for help topics and sections.
- Added weighted scoring: Title (10.0), Section (5.0), Content (1.0).
- Implemented snippet extraction with robust markdown highlighting.
- Optimized search by pre-compiling regexes for match finding.
- Updated CLI help command to display matched sections and snippets with ANSI bold.
- Added comprehensive tests for search accuracy and highlighting.
- Fixed missing `strings` import and added `--repo` flag to `auto-merge` workflow.
This commit is contained in:
Snider 2026-02-05 10:26:16 +00:00 • committed by GitHub
parent cd0615c1b6
commit 55792f9359
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GPG key ID: B5690EEEBB952194
3 changed files with 227 additions and 52 deletions
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29
internal/cmd/help/cmd.go
View file

@ -2,6 +2,7 @@ package help
import (
"fmt"
"strings"
"github.com/host-uk/core/pkg/cli"
"github.com/host-uk/core/pkg/help"
@ -28,7 +29,17 @@ func AddHelpCommands(root *cli.Command) {
}
fmt.Println("Search Results:")
for _, res := range results {
fmt.Printf(" %s - %s\n", res.Topic.ID, res.Topic.Title)
title := res.Topic.Title
if res.Section != nil {
title = fmt.Sprintf("%s > %s", res.Topic.Title, res.Section.Title)
}
// Use bold for title
fmt.Printf(" \033[1m%s\033[0m (%s)\n", title, res.Topic.ID)
if res.Snippet != "" {
// Highlight markdown bold as ANSI bold for CLI output
fmt.Printf(" %s\n", replaceMarkdownBold(res.Snippet))
}
fmt.Println()
}
return
}
@ -56,6 +67,22 @@ func AddHelpCommands(root *cli.Command) {
root.AddCommand(helpCmd)
}
func replaceMarkdownBold(s string) string {
parts := strings.Split(s, "**")
var result strings.Builder
for i, part := range parts {
result.WriteString(part)
if i < len(parts)-1 {
if i%2 == 0 {
result.WriteString("\033[1m")
} else {
result.WriteString("\033[0m")
}
}
}
return result.String()
}
func renderTopic(t *help.Topic) {
// Simple ANSI rendering for now
// Use explicit ANSI codes or just print

199
pkg/help/search.go
View file

@ -1,6 +1,7 @@
package help
import (
"regexp"
"sort"
"strings"
"unicode"
@ -16,15 +17,15 @@ type SearchResult struct {
// searchIndex provides full-text search.
type searchIndex struct {
topics map[string]*Topic // topicID -> Topic
index map[string]map[string]bool // word -> set of topicIDs
topics map[string]*Topic // topicID -> Topic
index map[string][]string // word -> []topicID
}
// newSearchIndex creates a new empty search index.
func newSearchIndex() *searchIndex {
return &searchIndex{
topics: make(map[string]*Topic),
index: make(map[string]map[string]bool),
index: make(map[string][]string),
}
}
@ -62,10 +63,13 @@ func (i *searchIndex) Add(topic *Topic) {
// addToIndex adds a word-to-topic mapping.
func (i *searchIndex) addToIndex(word, topicID string) {
if i.index[word] == nil {
i.index[word] = make(map[string]bool)
// Avoid duplicates
for _, id := range i.index[word] {
if id == topicID {
return
}
}
i.index[word][topicID] = true
i.index[word] = append(i.index[word], topicID)
}
// Search finds topics matching the query.
@ -81,7 +85,7 @@ func (i *searchIndex) Search(query string) []*SearchResult {
for _, word := range queryWords {
// Exact matches
if topicIDs, ok := i.index[word]; ok {
for topicID := range topicIDs {
for _, topicID := range topicIDs {
scores[topicID] += 1.0
}
}
@ -89,13 +93,23 @@ func (i *searchIndex) Search(query string) []*SearchResult {
// Prefix matches (partial word matching)
for indexWord, topicIDs := range i.index {
if strings.HasPrefix(indexWord, word) && indexWord != word {
for topicID := range topicIDs {
for _, topicID := range topicIDs {
scores[topicID] += 0.5 // Lower score for partial matches
}
}
}
}
// Pre-compile regexes for snippets
var res []*regexp.Regexp
for _, word := range queryWords {
if len(word) >= 2 {
if re, err := regexp.Compile("(?i)" + regexp.QuoteMeta(word)); err == nil {
res = append(res, re)
}
}
}
// Build results with title boost and snippet extraction
var results []*SearchResult
for topicID, score := range scores {
@ -106,14 +120,34 @@ func (i *searchIndex) Search(query string) []*SearchResult {
// Title boost: if query words appear in title
titleLower := strings.ToLower(topic.Title)
hasTitleMatch := false
for _, word := range queryWords {
if strings.Contains(titleLower, word) {
score += 2.0 // Title matches are worth more
hasTitleMatch = true
break
}
}
if hasTitleMatch {
score += 10.0
}
// Find matching section and extract snippet
section, snippet := i.findBestMatch(topic, queryWords)
section, snippet := i.findBestMatch(topic, queryWords, res)
// Section title boost
if section != nil {
sectionTitleLower := strings.ToLower(section.Title)
hasSectionTitleMatch := false
for _, word := range queryWords {
if strings.Contains(sectionTitleLower, word) {
hasSectionTitleMatch = true
break
}
}
if hasSectionTitleMatch {
score += 5.0
}
}
results = append(results, &SearchResult{
Topic: topic,
@ -125,14 +159,17 @@ func (i *searchIndex) Search(query string) []*SearchResult {
// Sort by score (highest first)
sort.Slice(results, func(a, b int) bool {
return results[a].Score > results[b].Score
if results[a].Score != results[b].Score {
return results[a].Score > results[b].Score
}
return results[a].Topic.Title < results[b].Topic.Title
})
return results
}
// findBestMatch finds the section with the best match and extracts a snippet.
func (i *searchIndex) findBestMatch(topic *Topic, queryWords []string) (*Section, string) {
func (i *searchIndex) findBestMatch(topic *Topic, queryWords []string, res []*regexp.Regexp) (*Section, string) {
var bestSection *Section
var bestSnippet string
bestScore := 0
@ -140,7 +177,7 @@ func (i *searchIndex) findBestMatch(topic *Topic, queryWords []string) (*Section
// Check topic title
titleScore := countMatches(topic.Title, queryWords)
if titleScore > 0 {
bestSnippet = extractSnippet(topic.Content, queryWords)
bestSnippet = extractSnippet(topic.Content, res)
}
// Check sections
@ -154,7 +191,7 @@ func (i *searchIndex) findBestMatch(topic *Topic, queryWords []string) (*Section
bestScore = totalScore
bestSection = section
if contentScore > 0 {
bestSnippet = extractSnippet(section.Content, queryWords)
bestSnippet = extractSnippet(section.Content, res)
} else {
bestSnippet = extractSnippet(section.Content, nil)
}
@ -163,7 +200,7 @@ func (i *searchIndex) findBestMatch(topic *Topic, queryWords []string) (*Section
// If no section matched, use topic content
if bestSnippet == "" && topic.Content != "" {
bestSnippet = extractSnippet(topic.Content, queryWords)
bestSnippet = extractSnippet(topic.Content, res)
}
return bestSection, bestSnippet
@ -207,17 +244,16 @@ func countMatches(text string, queryWords []string) int {
return count
}
// extractSnippet extracts a short snippet around the first match.
// Uses rune-based indexing to properly handle multi-byte UTF-8 characters.
func extractSnippet(content string, queryWords []string) string {
// extractSnippet extracts a short snippet around the first match and highlights matches.
func extractSnippet(content string, res []*regexp.Regexp) string {
if content == "" {
return ""
}
const snippetLen = 150
// If no query words, return start of content
if len(queryWords) == 0 {
// If no regexes, return start of content without highlighting
if len(res) == 0 {
lines := strings.Split(content, "\n")
for _, line := range lines {
line = strings.TrimSpace(line)
@ -232,13 +268,12 @@ func extractSnippet(content string, queryWords []string) string {
return ""
}
// Find first match position (byte-based for strings.Index)
contentLower := strings.ToLower(content)
// Find first match position (byte-based)
matchPos := -1
for _, word := range queryWords {
pos := strings.Index(contentLower, word)
if pos != -1 && (matchPos == -1 || pos < matchPos) {
matchPos = pos
for _, re := range res {
loc := re.FindStringIndex(content)
if loc != nil && (matchPos == -1 || loc[0] < matchPos) {
matchPos = loc[0]
}
}
@ -246,41 +281,113 @@ func extractSnippet(content string, queryWords []string) string {
runes := []rune(content)
runeLen := len(runes)
var start, end int
if matchPos == -1 {
// No match found, return start of content
if runeLen > snippetLen {
return string(runes[:snippetLen]) + "..."
}
return content
}
// Convert byte position to rune position (use same string as Index)
matchRunePos := len([]rune(contentLower[:matchPos]))
// Extract snippet around match (rune-based)
start := matchRunePos - 50
if start < 0 {
// No match found, use start of content
start = 0
}
end = snippetLen
if end > runeLen {
end = runeLen
}
} else {
// Convert byte position to rune position
matchRunePos := len([]rune(content[:matchPos]))
end := start + snippetLen
if end > runeLen {
end = runeLen
// Extract snippet around match (rune-based)
start = matchRunePos - 50
if start < 0 {
start = 0
}
end = start + snippetLen
if end > runeLen {
end = runeLen
}
}
snippet := string(runes[start:end])
// Trim to word boundaries
prefix := ""
suffix := ""
if start > 0 {
if idx := strings.Index(snippet, " "); idx != -1 {
snippet = "..." + snippet[idx+1:]
snippet = snippet[idx+1:]
prefix = "..."
}
}
if end < runeLen {
if idx := strings.LastIndex(snippet, " "); idx != -1 {
snippet = snippet[:idx] + "..."
snippet = snippet[:idx]
suffix = "..."
}
}
return strings.TrimSpace(snippet)
snippet = strings.TrimSpace(snippet)
if snippet == "" {
return ""
}
// Apply highlighting
highlighted := highlight(snippet, res)
return prefix + highlighted + suffix
}
// highlight wraps matches in **bold**.
func highlight(text string, res []*regexp.Regexp) string {
if len(res) == 0 {
return text
}
type match struct {
start, end int
}
var matches []match
for _, re := range res {
indices := re.FindAllStringIndex(text, -1)
for _, idx := range indices {
matches = append(matches, match{idx[0], idx[1]})
}
}
if len(matches) == 0 {
return text
}
// Sort matches by start position
sort.Slice(matches, func(i, j int) bool {
if matches[i].start != matches[j].start {
return matches[i].start < matches[j].start
}
return matches[i].end > matches[j].end
})
// Merge overlapping or adjacent matches
var merged []match
if len(matches) > 0 {
curr := matches[0]
for i := 1; i < len(matches); i++ {
if matches[i].start <= curr.end {
if matches[i].end > curr.end {
curr.end = matches[i].end
}
} else {
merged = append(merged, curr)
curr = matches[i]
}
}
merged = append(merged, curr)
}
// Build highlighted string from back to front to avoid position shifts
result := text
for i := len(merged) - 1; i >= 0; i-- {
m := merged[i]
result = result[:m.end] + "**" + result[m.end:]
result = result[:m.start] + "**" + result[m.start:]
}
return result
}

51
pkg/help/search_test.go
View file

@ -1,6 +1,7 @@
package help
import (
"regexp"
"strings"
"testing"
"unicode/utf8"
@ -208,9 +209,9 @@ The installation process is straightforward.
Finally, some closing remarks about the configuration.`
t.Run("finds match and extracts context", func(t *testing.T) {
snippet := extractSnippet(content, []string{"installation"})
assert.Contains(t, snippet, "installation")
assert.True(t, len(snippet) <= 200, "Snippet should be reasonably short")
snippet := extractSnippet(content, compileRegexes([]string{"installation"}))
assert.Contains(t, snippet, "**installation**")
assert.True(t, len(snippet) <= 250, "Snippet should be reasonably short")
})
t.Run("no query words returns start", func(t *testing.T) {
@ -219,17 +220,46 @@ Finally, some closing remarks about the configuration.`
})
t.Run("empty content", func(t *testing.T) {
snippet := extractSnippet("", []string{"test"})
snippet := extractSnippet("", compileRegexes([]string{"test"}))
assert.Empty(t, snippet)
})
}
func TestExtractSnippet_Highlighting(t *testing.T) {
content := "The quick brown fox jumps over the lazy dog."
t.Run("simple highlighting", func(t *testing.T) {
snippet := extractSnippet(content, compileRegexes([]string{"quick", "fox"}))
assert.Contains(t, snippet, "**quick**")
assert.Contains(t, snippet, "**fox**")
})
t.Run("case insensitive highlighting", func(t *testing.T) {
snippet := extractSnippet(content, compileRegexes([]string{"QUICK", "Fox"}))
assert.Contains(t, snippet, "**quick**")
assert.Contains(t, snippet, "**fox**")
})
t.Run("partial word matching", func(t *testing.T) {
content := "The configuration is complete."
snippet := extractSnippet(content, compileRegexes([]string{"config"}))
assert.Contains(t, snippet, "**config**uration")
})
t.Run("overlapping matches", func(t *testing.T) {
content := "Searching for something."
// Both "search" and "searching" match
snippet := extractSnippet(content, compileRegexes([]string{"search", "searching"}))
assert.Equal(t, "**Searching** for something.", snippet)
})
}
func TestExtractSnippet_Good_UTF8(t *testing.T) {
// Content with multi-byte UTF-8 characters
content := "日本語のテキストです。This contains Japanese text. 検索機能をテストします。"
t.Run("handles multi-byte characters without corruption", func(t *testing.T) {
snippet := extractSnippet(content, []string{"japanese"})
snippet := extractSnippet(content, compileRegexes([]string{"japanese"}))
// Should not panic or produce invalid UTF-8
assert.True(t, len(snippet) > 0)
// Verify the result is valid UTF-8
@ -244,6 +274,17 @@ func TestExtractSnippet_Good_UTF8(t *testing.T) {
})
}
// compileRegexes is a helper for tests.
func compileRegexes(words []string) []*regexp.Regexp {
var res []*regexp.Regexp
for _, w := range words {
if re, err := regexp.Compile("(?i)" + regexp.QuoteMeta(w)); err == nil {
res = append(res, re)
}
}
return res
}
// isValidUTF8 checks if a string is valid UTF-8
func isValidUTF8(s string) bool {
for i := 0; i < len(s); {