lerko
2684eb1d24
CI / test (pull_request) Successful in 2m18s
Press [ in detail view to open link picker showing all [[links]] in the current entry. Enter follows a link, resolving by title then body substring. Navigation history stack enables esc to pop back through followed links before returning to list. Adds Store.ResolveLink() for non-transactional link resolution from the TUI layer.
104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
package db
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import (
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"context"
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"database/sql"
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"strings"
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"github.com/lerko/nib/internal/link"
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)
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type Backlink struct {
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EntityID string
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Title *string
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Body string
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LinkText string
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}
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func (s *Store) resolveLink(ctx context.Context, tx *sql.Tx, linkText string, excludeID string) *string {
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lower := strings.ToLower(linkText)
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var id string
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err := tx.QueryRowContext(ctx, `
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SELECT id FROM entities
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WHERE LOWER(title) = ? AND id != ? AND deleted_at IS NULL
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ORDER BY created_at DESC LIMIT 1`, lower, excludeID).Scan(&id)
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if err == nil {
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return &id
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}
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err = tx.QueryRowContext(ctx, `
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SELECT id FROM entities
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WHERE LOWER(body) LIKE ? AND id != ? AND deleted_at IS NULL
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ORDER BY created_at DESC LIMIT 1`, "%"+lower+"%", excludeID).Scan(&id)
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if err == nil {
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return &id
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}
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return nil
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}
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func syncLinks(ctx context.Context, tx *sql.Tx, s *Store, entityID string, body string) error {
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if _, err := tx.ExecContext(ctx, "DELETE FROM entity_links WHERE from_id = ?", entityID); err != nil {
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return err
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}
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linkTexts := link.ExtractLinks(body)
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for _, lt := range linkTexts {
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toID := s.resolveLink(ctx, tx, lt, entityID)
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if _, err := tx.ExecContext(ctx,
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"INSERT OR IGNORE INTO entity_links (from_id, to_id, link_text) VALUES (?, ?, ?)",
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entityID, toID, lt); err != nil {
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return err
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}
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}
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return nil
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}
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func (s *Store) ResolveLink(ctx context.Context, linkText string) (*Entity, error) {
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lower := strings.ToLower(linkText)
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var id string
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err := s.db.QueryRowContext(ctx, `
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SELECT id FROM entities
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WHERE LOWER(title) = ? AND deleted_at IS NULL
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ORDER BY created_at DESC LIMIT 1`, lower).Scan(&id)
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if err != nil {
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err = s.db.QueryRowContext(ctx, `
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SELECT id FROM entities
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WHERE LOWER(body) LIKE ? AND deleted_at IS NULL
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ORDER BY created_at DESC LIMIT 1`, "%"+lower+"%").Scan(&id)
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}
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if err != nil {
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return nil, ErrNotFound
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}
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return s.Get(ctx, id)
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}
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func (s *Store) LoadBacklinks(ctx context.Context, entityID string) ([]Backlink, error) {
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rows, err := s.db.QueryContext(ctx, `
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SELECT e.id, e.title, e.body, el.link_text
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FROM entity_links el
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JOIN entities e ON e.id = el.from_id
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WHERE el.to_id = ? AND e.deleted_at IS NULL
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ORDER BY e.created_at DESC`, entityID)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var backlinks []Backlink
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for rows.Next() {
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var bl Backlink
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var title sql.NullString
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if err := rows.Scan(&bl.EntityID, &title, &bl.Body, &bl.LinkText); err != nil {
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return nil, err
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}
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if title.Valid {
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bl.Title = &title.String
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}
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backlinks = append(backlinks, bl)
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}
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return backlinks, rows.Err()
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}
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