bbs-md/.planning/quick/1-arrow-key-navigation-and-directory-descr/1-SUMMARY.md

phase, plan, subsystem, tags, dependency_graph, tech_stack, key_files, decisions, metrics

phase	plan	subsystem	tags	dependency_graph	tech_stack	key_files	decisions	metrics
quick-1	01	navigation, directory-listing	arrow-keys frontmatter directory vault	requires provides affects ARROW-NAV DIR-DESC src/app.rs src/vault.rs	added patterns yaml-frontmatter-parsing bufreader-take	created modified src/app.rs src/vault.rs	Bare Left/Right go after Alt+Left/Right guards in match — Rust match guards ensure Alt+Left is consumed first Read only first 20 lines via BufReader + take(20) — avoids loading large files for metadata strip_span covers only [name] bracket, not description — keeps Tab-cycling highlight correct 78-char truncation budget applied after accounting for indent and separator widths	duration completed tasks_completed files_modified 5 min 2026-03-01T10:38:54Z 1 2

Quick Task 1: Arrow Key Navigation and Directory Descriptions Summary

One-liner: Bare Left/Right arrow keys navigate history and directory listing shows YAML frontmatter descriptions in DarkGray beside each file entry.

What Was Built

Part A — Bare arrow key navigation (src/app.rs)

Added two new match arms to handle_key() immediately after the Alt+Left/Alt+Right guarded arms:

KeyCode::Left => {
    self.navigate_back();
}
KeyCode::Right => {
    self.navigate_forward();
}

The match arm order is critical: the guarded KeyCode::Left if key.modifiers.contains(KeyModifiers::ALT) arms are checked first. Bare Left/Right fall through to the new unguarded arms only when ALT is not held. Updated the doc comment on handle_key() to document the new bindings.

Part B — Frontmatter description parsing (src/vault.rs)

Added a description: Option<String> field to DirEntry.

Added extract_frontmatter_description(path: &Path) -> Option<String>:

• Opens the file with BufReader and reads at most 20 lines (lines().take(20))
• Checks first line is exactly ---
• Scans for description: key, stops at closing ---
• Strips surrounding single or double quotes if present
• Returns Some(value) or None

Updated list_vault_files() to call extract_frontmatter_description() for each .md file and populate the field. Directory entries get description: None.

Part C — Description display in directory listing (src/app.rs)

Updated build_directory_lines() to append description spans for file entries that have one:

  [filename]  description text here, truncated...

• Two-space separator (" ") between the bracketed name and description
• Description rendered as Span::styled(text, Style::default().fg(Color::DarkGray))
• Truncation budget: 78 - indent_chars - span_len - 2, appending "..." if clipped
• link_records entry's span_len covers only the [name] bracket — description is a separate span and not part of the link highlight range

Deviations from Plan

None - plan executed exactly as written.

Self-Check

• src/app.rs modified — bare Left/Right arms present, description display in build_directory_lines()
• src/vault.rs modified — description field on DirEntry, extract_frontmatter_description() helper, list_vault_files() populates field
• cargo build — clean (0 new warnings)
• cargo clippy — clean (all warnings pre-existing in unrelated files)
• Commit f0ec2ed exists

Self-Check: PASSED