claude/fix hostname from dbjson 9a1f40de

[twistedmelonman]

• docs: design db.json hostname resolution for list-clients
• fix(list-clients): resolve real hostnames from Synergy db.json

[claude]

The change adds db.json-based hostname resolution to bin/list-clients to fix a client whose Synergy screen name has its hyphen dropped. Key logic review:

• Glob pattern for suffix detection (local hex='[0-9a-fA-F]' + eight $hex expansions in [[ pattern): correct — [[ expands character classes on the RHS of ==, so $hex becomes [0-9a-fA-F] in the pattern. Behaves correctly on bash 3.2.
• Suffix extraction (${label##*-} / ${label%-*}): strips the right segment regardless of hyphens in the base name (e.g. arich-mac-3181d4b4 → suffix 3181d4b4, base arich-mac). Correct.
• jq .id[-8:] join key: matches the last 8 chars of the full 64-char sha, which is what Synergy appends as the screen suffix. Verified against the test fixtures.
• Fallback path: [[ -n "$suffix" && -n "$db_map" ]] guard means empty db_map (jq absent, db.json missing, or malformed JSON via || true) sends every label through the existing heuristic. Non-regression.
• set -e + labels="$(awk...)" propagation: the awk exit 2 on unclosed section propagates through the command substitution assignment — script exits 2 as intended.
• || true on jq invocation: correctly swallows jq failures so malformed JSON degrades silently rather than aborting.

No bugs, regressions, security issues, or data-loss risks found.

VERDICT: PASS

[claude]

The PR adds db.json-based hostname resolution to bin/list-clients so Synergy's sanitized screen names (e.g. arichmac-3181d4b4) map back to their real display names (e.g. arich-mac.local).

No blocking issues found. Key correctness points verified:

• set -euo pipefail at line 2 ensures awk's exit 2 (unterminated-section guard) propagates through labels="$(awk ...)" — not swallowed.
• 2>/dev/null || true on the jq call prevents a set -e abort when jq is absent or db.json is malformed; db_map stays empty and every screen takes the heuristic path.
• stderr from awk inside $(...) flows through to the outer shell, so the "not closed" error message still surfaces.
• The glob pattern *-$hex$hex...$hex (8 times) correctly identifies and extracts the 8-hex suffix without relying on {n} intervals or BASH_REMATCH, keeping bash 3.2 compatibility.

VERDICT: PASS

[claude]

The PR adds db.json-based hostname resolution to bin/list-clients so Synergy's sanitized screen names (e.g. arichmac-3181d4b4) map back to their real display names (e.g. arich-mac.local).

No blocking issues found. Key correctness points verified:

• set -euo pipefail at line 2 ensures awk's exit 2 (unterminated-section guard) propagates through labels="$(awk ...)" — not swallowed.
• 2>/dev/null || true on the jq call prevents a set -e abort when jq is absent or db.json is malformed; db_map stays empty and every screen takes the heuristic path.
• stderr from awk inside $(...) flows through to the outer shell, so the "not closed" error message still surfaces.
• The glob pattern *-$hex$hex...$hex (8 times) correctly identifies and extracts the 8-hex suffix without relying on {n} intervals or BASH_REMATCH, keeping bash 3.2 compatibility.

VERDICT: PASS