~derf
dark mode

You have reached the personal homepage of an on-line entity known as derf / derfnull. Hi! đź‘‹

About

I enjoy doing things and post some of them on this website. Things may include taking photos, poking at public transit APIs, or putting caffeine into chocolate. Blinkenlights and embedded development are nice, too, though I don't really get around to that anymore.

When it comes to (paid) work, peers usually know me as Birte Friesel. In case you are looking to offer paid work, I also have a small work homepage on this site with a minimal CV and some more details about what I can (and am willing to) do.

Resources

Contact

You can reach me by E-Mail (d​erf@fina​lr​ewind.org) and on IRC (derf0 @ oftc, hackint). My PGP key for E-Mail encryption is 64FE6EC0 55560F9E F13A3044 19E6E524 EBB177BA. I occasionally post stuff on the Fediverse (@derf@social.skyshaper.org).

The remainder of this page duplicates a curated sub-set of projects and the latest blog entries.

Projects

Travel::Routing::DE::HAFAS v0.07
Interface to HAFAS itinerary services 
> hafas 'Eichlinghofen H-Bahn, Dortmund' 'Dortmund Hbf'

00:15        Schw-B HB5  (0:03)  S 1

Schw-B HB5 → Universität S-Bahnhof, Dortmund
21:51  ab  Eichlinghofen H-Bahn, Dortmund
21:55  an  Universität S-Bahnhof, Dortmund

Walk 37m  (approx. 3 minutes)
S 1 → Dortmund Hbf
21:58  ab  Dortmund Universität: 2
22:06  an  Dortmund Hbf: 4
Travel::Routing::DE::EFA v2.24
Interface to EFA-based itinerary services 
> efa Essen Martinstr DĂĽsseldorf Hbf
14:34 ab  Essen Martinstr.: Bstg. 1      StraĂźenbahn 108      Essen Altenessen Bf Schleife
14:38 an  Essen Hauptbahnhof: Bstg. 1

14:47 ab  Essen Hauptbahnhof: 2          R-Bahn RE11 (RRX)    DĂĽsseldorf Hbf
15:24 an  DĂĽsseldorf Hbf: 10
Travel::Status::DE::HAFAS v6.03
Interface to HAFAS-based arrival/departure monitors 
> hafas-m 'Hamburg Dammtor'
14:43  +45  ICE 2922  Hamburg-Altona
15:10       U 1       Ohlstedt, Hamburg
15:10  +4   Bus 112   Osterbrookplatz, Hamburg
15:10       NBE RB61  Itzehoe
Travel::Status::DE::IRIS v1.96
Interface to the Deutsche Bahn IRIS arrival/departure monitor 
> db-iris 'Dortmund Hbf'
14:38 +16  IC 2027     Passau Hbf            11
14:39      ABR RE11    Kassel-Wilhelmshöhe   8
14:41      RE 57       Winterberg(Westf)     2
└────      RE 57       Brilon Wald           2
14:41      S 5         Hagen Hbf             5
14:42      S 2         Dortmund Hbf          6
14:45 +1   RE 1        Aachen Hbf            16
db-infoscreen
App/Infoscreen for Railway Departures in Germany
TODO!
feh v3.10.2
imlib2 based image viewer
TODO!
msp430-etv
MSP430 EnergyTrace viewer
TODO!
travelynx
Railway Travel Logger
TODO!
zlib-deflate-nostdlib
C/C++ embedded decompression library
TODO!

News

2024-04-15 00:00

Travel::Status::DE::DeutscheBahn v6.03

Travel-Status-DE-DeutscheBahn-6.03.tar.gz (signature)

  • Journey: Add product_at accessor
2024-04-13 00:00

Travel::Routing::DE::HAFAS v0.07

Travel-Routing-DE-HAFAS-0.07.tar.gz (signature)

  • Replace built-in HAFAS service list with the one provided by Travel::Status::DE::HAFAS
  • Convert non-local time stamps to backend-specific time zone
  • hafas: Add -x / --exclude-infeasible and -j / --with-jid options
  • HAFAS::Connection::Section: Support unspecified local transit (TRSF)
2024-04-12 00:00

Travel::Status::DE::DeutscheBahn v6.02

Travel-Status-DE-DeutscheBahn-6.02.tar.gz (signature)

  • hafas-m: Add -j / --with-jid option
  • $hafas->station: Correctly determine "name" and "eva" for stations that have multiple EVA IDs and names.
2024-04-04 00:00

Travel::Status::DE::DeutscheBahn v6.01

Travel-Status-DE-DeutscheBahn-6.01.tar.gz (signature)

  • Journey: Add operators accessor
  • Add CMTA (Capital Metropolitan Transportation Authority) and BLS (BLS AG) services
2024-04-02 00:00

Travel::Status::DE::DeutscheBahn v6.00

Travel-Status-DE-DeutscheBahn-6.00.tar.gz (signature)

  • Add AVV (Aachener Verkehrsverbund), BART (Bay Area Rapid Transit), and IE (IarnrĂłd Éireann / Irish Rail) backends
  • Support backend-specific time zones; add time_zone to service description
  • Handle cross-timezone journeys and stops whose time zone differs from the backend's default time zone. As of this release, all input and output datetimes refer to the backend's default time zone rather than local time (Stop and Journey accessors) / whatever (hafas-m and HAFAS arguments). Use the new tz_offset accessor to determine local time. This is a breaking change.
  • Journey, Stop: Add tz_offset accessor
2024-03-29 00:00

Travel::Status::DE::DBWagenreihung v0.12

Travel-Status-DE-DBWagenreihung-0.12.tar.gz (signature)

  • Wagon: Add is_closed accessor
2024-03-28 00:00

Travel::Routing::DE::HAFAS v0.06

Travel-Routing-DE-HAFAS-0.06.tar.gz (signature)

  • hafas: Add -C / --change-time option
  • HAFAS: Add min_change_time option
2024-03-28 00:00

Travel::Status::DE::DeutscheBahn v5.06

Travel-Status-DE-DeutscheBahn-5.06.tar.gz (signature)

  • Add Travel::Status::DE::HAFAS::Product module to handle line numbers, operators, and similar. This enables proper support for journeys with multiple operators and possibly multiple train/line numbers along the route. It also exposes the line ID.
  • Journey: Add product accessor
  • Stop: Add prod_arr, prod_dep accessors
  • hafas-m: Improve stop list display in journey mode
  • Fix polyline and platform number support in Ă–BB backend (and possibly other non-DB backends)
  • Ă–BB backend: correctly handle polylines and platform numbers
  • Ă–BB backend: Remove redundant train numbers from $journey->name / $journey->line / $product->name
  • Ă–BB backend: update productbits (thanks to Cassidy Dingenskirchen)
2024-03-24 00:00

Travel::Routing::DE::HAFAS v0.05

Travel-Routing-DE-HAFAS-0.05.tar.gz (signature)

  • hafas: Add -c / --max-change option
  • hafas: Add optional via arguments
  • HAFAS: Add max_change option
  • HAFAS: Add via_stops option
2024-03-07 00:00

Travel::Status::DE::DBWagenreihung v0.11

Travel-Status-DE-DBWagenreihung-0.11.tar.gz (signature)

  • Add another regional train model
  • Wagon: Add group_index accessor
2024-03-04 00:00

Travel::Status::DE::DBWagenreihung v0.10

Travel-Status-DE-DBWagenreihung-0.10.tar.gz (signature)

  • Add additional regional train models
2024-03-03 00:00

Travel::Status::DE::DBWagenreihung v0.09

Travel-Status-DE-DBWagenreihung-0.09.tar.gz (signature)

  • Add various regional train models
  • wagongroup_description, train_descriptions: Add short variants
2024-02-26 00:00

Travel::Routing::DE::HAFAS v0.04

Travel-Routing-DE-HAFAS-0.04.tar.gz (signature)

  • hafas: Add --raw-json option
  • Handle undefined occupancy and partial cancellations
  • Update Ă–BB modes of transport (mot list)
2024-02-25 00:00

Travel::Status::DE::IRIS v1.96

Travel-Status-DE-IRIS-1.96.tar.gz (signature)

  • Re-add Wipperliese stations (service resumes on March 29th, 2024)
  • IRIS->new / get_station: correctly handle non-EVA station identifiers in with_related mode. Previously, these caused (harmless, but annoying) "isn't numeric in numeric eq (==)" warnings.
2024-02-22 00:00

Travel::Status::DE::IRIS v1.95

Travel-Status-DE-IRIS-1.95.tar.gz (signature)

  • Update qos/delay message texts