chore: release v0.4.0

[nyurik]

🤖 New release

• dbc-codegen: 0.3.0 -> 0.4.0 (✓ API compatible changes)
• dbc-codegen-cli: 0.3.0 -> 0.4.0

Changelog

dbc-codegen

0.4.0 - 2026-09-02

Added

• optional padding bit value (#184)
• add DBC_FILE_NAME + ver, proper code formatting (#131)
• [breaking] streamline DBC code generation and file writing (#128)

Fixed

• support large min/max values without precision loss (#152)
• handle duplicate signal names (#126)
• handle empty relevant msgs in from_can_message (#125)
• fix typo
• fix formatting errors
• fix factor/offset not getting applied to 0 for unsigned case
• fix duplicate enum names on multiplex messages
• fix issue where signed signals would be rendered as unsigned

Other

• Remove unsafe from generated MESSAGE_ID constants (#194)
• Generate raw signal getters and setters (#193)
• Support relation attributes in attribute_structs (#192)
• Generate enum-typed setters and constructors for signals with value descriptions (#178)
• Emit MESSAGE_CYCLE_TIME as integer (#186)
• Generate message size and cycle time consts (#176)
• Add option to generate typed constants from DBC attributes (#175)
• update can-dbc (#181)
• rust ver bump (#182)
• cleanup clippy, justfile, and proj cleanup (#180)
• (deps) bump the all-cargo-version-updates group across 1 directory with 4 updates (#172)
• (deps) bump codecov/codecov-action from 6 to 7 in the all-actions-version-updates group (#165)
• (deps) bump the all-cargo-version-updates group across 1 directory with 4 updates (#168)
• (deps) bump the all-cargo-version-updates group across 1 directory with 3 updates (#163)
• (deps) bump the all-cargo-version-updates group with 2 updates (#161)
• (deps) bump the all-cargo-version-updates group across 1 directory with 2 updates (#158)
• (deps) bump the all-actions-version-updates group across 1 directory with 2 updates (#159)
• update expected errors to Rust 1.94 (#153)
• (deps) bump the all-cargo-version-updates group across 1 directory with 2 updates (#145)
• (deps) bump insta from 1.46.2 to 1.46.3 in the all-cargo-version-updates group (#143)
• upgrade to rust 1.93 stderr (#142)
• (deps) bump the all-cargo-version-updates group across 1 directory with 4 updates (#141)
• [breaking] remove main fn from generated code (#138)
• make many rendering fn methods on config (#133)
• (deps) bump clap from 4.5.54 to 4.5.55 in the all-cargo-version-updates group (#134)
• use quote crate to handle str escaping (#132)
• noop - dedup, cleanup, new type abstraction (#130)
• update shared tests, bump deps, freeze to rust 1.92 (#127)
• (deps) bump can-dbc from 8.0.0 to 8.0.1 in the all-cargo-version-updates group (#129)
• do not clean lock
• bump dependencies and enable verbose output for release actions (#120)
• [pre-commit.ci] pre-commit autoupdate (#119)
• Bump the all-cargo-version-updates group across 1 directory with 2 updates (#118)
• refactor write functions, improve CI, MSRV (#116)
• minor code cleanup (#114)
• generate and compile all .dbc files from test repo (#113)
• allow generated file to be used with include! (#108)
• Bump the all-cargo-version-updates group across 1 directory with 2 updates (#111)
• minor justfile fix, editorconfig (#112)
• Bump actions/cache from 4 to 5 in the all-actions-version-updates group (#110)
• OxiBUS onboarding cleanup (#102)
• run just fmt to cleanup imports (#107)
• Bump the all-cargo-version-updates group across 1 directory with 9 updates (#106)
• upgrade to can-dbc v8 (#101)
• Bump actions/checkout from 1 to 6 in the all-actions-version-updates group (#104)
• (CI) minor CI updates, automate dependabot (#103)
• Add optional defmt::Format support for generated types
• Merge pull request Use message name instead of self #85 from inomotech-foss/fix-mux-msg-id
• Use message name instead of self
• Generate embedded_can::Frame trait for each frame
• Represent CAN message IDs as embedded_can::Id to support extended IDs
• Fix issue with decoding signed values of non-standard length
• revert change to Cargo.toml, not necessary
• address clippy's concerns (thanks clippy), enhance comments
• make can-messages dependency optional so it doesn't pull in std
• reduce diff against main
• handle more edge cases, use i128 as the maximum type
• reorder lines to match signals
• drop symlink in favor of copy so it works on Windows
• revert because I missed the case of check_ranges being false
• add tests, edge cases where the min/max is way less than signal width
• clean up warning
• add unsigned to the name, add test case
• change signal logic to handle negative factors, add tests
• Bump rustc to latest stable, 1.78
• Merge pull request Remove warnings in generated code #68 from projectgus/tweaks/codegen_warnings
• Rename .envrc for non-Nix users, add note in README
• dont assign signed integers to unsigned integers
• Update README
• Fix clippy warnings
• Use checked_sub(offset) for set_signal methods
• Don't treat signals as floats if factor is integer
• Add flag to impl std Error
• Tweak docs and optional features
• Make feature-gated impls configurable

dbc-codegen-cli

0.4.0 - 2026-09-02

Added

• [breaking] streamline DBC code generation and file writing (#128)

Other

• Generate raw signal getters and setters (#193)
• Support relation attributes in attribute_structs (#192)
• Generate message size and cycle time consts (#176)
• Add option to generate typed constants from DBC attributes (#175)
• cleanup clippy, justfile, and proj cleanup (#180)
• (deps) bump the all-cargo-version-updates group with 2 updates (#161)
• minor code cleanup (#114)
• allow generated file to be used with include! (#108)
• OxiBUS onboarding cleanup (#102)
• run just fmt to cleanup imports (#107)
• Bump the all-cargo-version-updates group across 1 directory with 9 updates (#106)
• upgrade to can-dbc v8 (#101)
• make debug_prints configurable
• Merge pull request Remove warnings in generated code #68 from projectgus/tweaks/codegen_warnings
• Rename .envrc for non-Nix users, add note in README
• Update README
• Make feature-gated impls configurable

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This PR was generated with release-plz.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[liamkinne]

@nyurik How soon will this be published? I would like to publish a crate that depends on dbc-codegen but I cant do so with it as a git dependency.

[nyurik]

i need to review its state, but i can try to get it done this week

[felixvanoost]

@nyurik can we release?

[nyurik]

have we decided if we can keep it backwards compatible, by leaving redirection functions and adding deprecation warnings? Or do we really want a breaking change?

[felixvanoost]

I'm in favour of a breaking change release for 2 reasons:

1. Since v0.3.0, some functions have retained the same names (new() and set_<signal>()) but now use enum-typed arguments instead of integers (Generate enum-typed setters and constructors for signals with value descriptions #178). This is hard to redirect without causing additional confusion, especially since the API is now symmetrical between getters and setters. Previously, only the getters used enums.
2. I think there would be considerable confusion in retaining + deprecating the old <signal>_raw(), which returned a scaled (not raw) signal value, alongside the new <signal>_raw_val() which returns the actual raw signal value. In this case too, the new naming is more consistent than before.

Perhaps the following table might be useful in the release notes:

Interface element	v0.3.0	Latest	Migration
new() constructor	Took the signal's raw scalar type (e.g. i8)	Takes the signal's generated enum type (e.g. FooFoo)	Use the enum types directly or wrap the raw values (e.g. Foo::new(FooFoo::_Other(raw_value))
Raw getter	signal_name_raw() returned a scaled signal with factor/offset applied	Replaced by signal_name_raw_val(), which returns the unscaled raw bits	Use signal_name() for physical value or signal_name_raw_val() for raw value.
Raw setter	Not available	set_signal_name_raw_val(value)	New addition
Physical value setter set_signal_name()	Took the signal's raw scalar type (e.g. i8)	Takes the signal's generated enum type (e.g. FooFoo)	Use the enum types directly or wrap the raw values (e.g. msg.set_foo(FooFoo::_Other(raw_value))
Multiplexor selector	pub fn signal_name(&mut self) -> Result<Enum, CanError>	Renamed to signal_name_multiplexed(&mut self)	Rename function calls