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left4me/l4d2web
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mwiegand 54842f71c6
fix(editor-v2): fix cm6 to rows-derived height, eliminate layout shift 
CLS verified zero (0.00000) on /blueprints/1 and /overlays/1 via
PerformanceObserver({type: 'layout-shift', buffered: true}) on a
real browser session — previously CLS=0.00859 from a 253 px shift
when cm6 mounted into a display:none slot.

Mechanism:
- editor-entry.js: mount() accepts `rows`. When provided, prepends
  an EditorView.theme that pins
    .cm-editor { height: calc(rows * 1.84rem + 1.125rem) }
  and sets .cm-scroller overflow:auto. cm6 renders at a fixed,
  predictable height; long content scrolls internally (same UX the
  raw <textarea rows="N"> used to give).
- editor.js: reads textarea.rows attribute and passes it to mount().
- editor.css: new .editor-mount wrapper uses the same calc on
  min-height keyed off an inline --editor-rows CSS custom property,
  so the slot is pre-reserved BEFORE cm6 mounts. Wrapper and cm6
  match exactly (browser-measured 254 / 254 px for rows=8 and
  607 / 607 px for rows=20).
- Templates: each editor textarea wrapped in
  <div class="editor-mount" style="--editor-rows: N">. Single source
  of truth on N (only the rows attribute + the inline custom prop
  vary per call site).

Per-row metric 1.84 rem derived empirically: 253 px for rows=8 minus
1.125 rem chrome = 235 px content, ÷ 8 ≈ 29.4 px = 1.84 rem.

Fast suite + e2e suite still green (3 + 2 pass, 0 fail).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-17 10:27:28 +02:00
..
alembic feat(l4d2-web): add command_history table for RCON console transcript 2026-05-14 21:26:56 +02:00
l4d2web fix(editor-v2): fix cm6 to rows-derived height, eliminate layout shift 2026-05-17 10:27:28 +02:00
scripts fix(editor-v2): fix cm6 to rows-derived height, eliminate layout shift 2026-05-17 10:27:28 +02:00
tests test(editor-v2): Playwright e2e + Tab→acceptCompletion fix 2026-05-17 02:15:51 +02:00
alembic.ini chore(l4d2): flatten component layout 2026-05-05 23:47:06 +02:00
pyproject.toml refactor(repo): uv workspace + hatchling + layout restructure 2026-05-15 22:04:29 +02:00
README.md refactor(repo): uv workspace + hatchling + layout restructure 2026-05-15 22:04:29 +02:00

README.md

l4d2-web-app

Flask web app for managing L4D2 servers through user-private blueprints.

Key v1 behaviors

  • Local username/password login; no public signup
  • Admin-managed overlay catalog
  • Private blueprints per user
  • Server creation from blueprints (live-linked; no per-server blueprint overrides)
  • Async job model with persisted command logs in job_logs
  • Desired vs actual state model
  • Live logs for jobs and servers via SSE endpoints
  • Host operations go through l4d2ctl via a local host command runner, not direct l4d2host imports

Frontend constraints

  • Server-rendered templates (Jinja)
  • Vendored HTMX (static/vendor/htmx.min.js)
  • Custom CSS only
  • Tokenized, consistent link and accent colors

Development

From the workspace root (../):

uv sync          # creates .venv, installs l4d2host + l4d2web editable, plus dev deps
uv run pytest l4d2web/tests -q

Configuration

The web app reads these settings from the environment:

  • DATABASE_URL: SQLAlchemy database URL, for example sqlite:////var/lib/left4me/left4me.db.
  • SECRET_KEY: Flask secret key used for sessions and CSRF-sensitive state.
  • JOB_WORKER_THREADS: number of background job worker threads.

In the systemd deployment, environment is loaded from /etc/left4me/host.env and /etc/left4me/web.env.

Admin Bootstrap

Create the first admin account with the Flask CLI. Provide the password through LEFT4ME_ADMIN_PASSWORD:

LEFT4ME_ADMIN_PASSWORD='change-me' flask create-user <username> --admin