Interline Transitland

transitland-lib is a library and command-line tool for reading, writing, and processing transit data in GTFS and related formats. The library is structured as a set of data sources, filters, and transformations that can be mixed together in a variety of ways to create processing pipelines. The library supports the DMFR format to describe feed resources.

Table of Contents

• Installation
  • Download prebuilt binary
  • Install using homebrew
  • Install binary from source
• Usage as a CLI tool
  • Breaking changes
• Usage as a library
• Database migrations
• Usage as a Web Service
• Included Readers and Writers
• Development
  • Releases
• Licenses

Installation

Download prebuilt binary

The transitland binaries for Linux and macOS are attached to each release.

Install using homebrew

The transitland binary can be installed using homebrew. The executable is code-signed and notarized.

brew install interline-io/transitland-lib/transitland-lib

Install binary from source

go get github.com/interline-io/transitland-lib/cmd/transitland

This package uses Go Modules and will also install required dependencies.

Main dependencies:

• twpayne/go-geom
• jmoiron/sqlx
• Masterminds/squirrel
• jackc/pgx
• mattn/go-sqlite3 (requires CGO)

Usage as a CLI tool

The main subcommands are:

• transitland copy - Copy performs a basic copy from a reader to a writer.
• transitland diff - Calculate difference between two feeds, writing output in a GTFS-like format
• transitland dmfr-format - Lint DMFR files
• transitland dmfr-lint - Format a DMFR file
• transitland extract - Extract a subset of a GTFS feed
• transitland fetch - Fetch GTFS data and create feed versions
• transitland import - Import feed versions
• transitland merge - Merge multiple GTFS feeds
• transitland sync - Sync DMFR files to database
• transitland unimport - Unimport feed versions
• transitland validate - Validate a GTFS feed

Breaking changes

Note: as of v0.17, we moved from Go standard library flags to Cobra's pflags; this is a breaking change in that single-dash (-flag) command flags are no longer supported, only double-dash (--flag).

Usage as a library

See library examples.

Database migrations

Migrations are supported for PostgreSQL, using the schema files in internal/schema/postgres/migrations. These files can be read and applied using golang-migrate, which will store the most recently applied migration version in schema_migrations. See the bootstrap.sh script in that directory for an example, as well as details on how to import Natural Earth data files for associating agencies with places.

SQLite database are intended to be short-lived. They can be created on an as needed basis by passing the -create flag to some commands that accept a writer. They use a single executable schema, defined in internal/schema/sqlite.sql.

Usage as a Web Service

See transitland-server documentation.

Included Readers and Writers

Target	Module	Supports Read	Supports Write
CSV	tlcsv	✅	✅
SQLite	tldb	✅	✅
PostgreSQL (with PostGIS)	tldb	✅	✅

We welcome the addition of more readers and writers.

Development

transitland-lib follows Go coding conventions.

GitHub Actions runs all tests, stores code coverage reports as artifacts, and prepares releases.

Releases

Releases follow Semantic Versioning conventions.

To cut a new release:

1. Run go generate ./... to update auto-generated documentation.
2. Create a GitHub release. This will create a tag and GitHub Actions will create & attach code-signed binaries.
3. Download the files from the release, and update the homebrew formula with the updated sha256 hashes and version tag.

Licenses

transitland-lib is released under a "dual license" model:

• open-source for use by all under the GPLv3 license
• also available under a flexible commercial license from Interline