randy
d2900361b3
ReceiptBuilder#image implements GS v 0 raster printing (no image library needed for the demo -- a procedural 8px checkerboard proves it end to end). Skipped attempting the printer's real-time clock: unsure the TM-T20II actually has a battery-backed RTC (that's usually an option on higher-end models), not worth guessing at an undocumented command.
labelprint
Unified UI for printing labels/stickers:
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Native ZPL printing to a Datamax-ONeil thermal barcode printer
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A proxy/switcher in front of three brother_ql_web instances, one per Brother QL printer
Routes
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/— upload a PDF and print it (ZPL) -
/upload— upload form -
/test-print— print the bundled test label -
/brother— list of Brother QL printers -
/brother/<printer>/*— proxied to that printer’s brother_ql_web instance (UI and API alike)
Running
bundle install
bundle exec ruby app.rbRequires config.json (see printer definitions inside) and a .session_secret file (random string, not committed).
Deployment
Runs as sinatra.service (systemd) on rpi-printserver.local, under RVM (rvm default do bundle exec ruby app.rb — always uses whatever ruby is currently the RVM default, no manual bumping needed).
.gitea/workflows/deploy.yaml deploys on every push to main: SSH into rpi-printserver.local, git pull, bundle install, restart the service.
Dependency updates
.gitea/workflows/renovate.yaml runs Renovate on a schedule (Monday 06:00 Europe/Bratislava, or manually) to open PRs for outdated gems and GitHub Actions. See the "Dependency Dashboard" issue for current status.