Changelog

All notable changes to tricorder will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to the PVP.

[Unreleased]

0.2.1.0 - 2026-08-17

Added

• Tricorder now respects all forms of cabal.project files, like cabal.project.local for example. See Cabal’s documentation on project description files. (#73)
• With hpack in PATH, Tricorder will now run hpack in the directory of any changed package.yaml file in the root of the project or any subdirectory. Control this behavior with the generate_with_hpack configuration.
• Tricorder will now restart the GHCi session when detecting changes to a project’s stack.yaml.

[0.2.0.1] - 2026-08-12

Fixed

• tricorder source does not work without cabal in PATH (for stack projects, for example). Tricorder now fetches tarballs for source distributions manually with good old-fashioned HTTP instead of relying on cabal fetch. This means tricorder source works regardless whether cabal or stack is in PATH. (Still requires ghc-pkg to be in PATH though to resolve the module name to a package.)
• Incorrect repl command used for eval comments. This caused eval comments not to be able to use a module’s top-level definitions in its expression.
• Auto-resolved targets are not compatible with stack ghci (and its alias stack ghci). Targets are now automatically resolved with package name, pkg:kind:name for multi-package repos and just name for single-package repos, instead of just with the component name and kind kind:name. stack ghci is not compatible with the form kind:name (but cabal repl is), but both of them are compatible with the fully qualified pkg:kind:name form. If you manually specify a kind:name target in your stack repo’s .tricorder.yaml though, you are on your own!

[0.2.0.0] - 2026-08-06

Added

• The TUI can now restart the daemon — press R (the restart_daemon key event, rebindable like the others). It reconnects automatically once the fresh daemon is ready.
• Support for eval comments. See Features of Tricorder - Eval Comments for more information
• tricorder eval-comments subcommand.
• tricorder log --print-path prints the path to the current repo’s Tricorder log file.

Fixed

• No diagnostics are listed in single-package repos.
• Build loops on startup failure.

Changed

• tricorder source now uses a package’s sdist tarball from cabal’s global cache instead of parsing Haddock-HTML, fetching them if necessary. This allows Tricorder to show sources for packages without documentation.

Removed

• Observability and metrics stack.

[0.1.1.0] - 2026-06-26

Added

• Configurable watch_exclusion_patterns to exclude paths from the file watcher.
• The TUI now presents its different views as tabs.

Fixed

• Terminate the whole cabal process group on shutdown, so children that trap SIGINT are no longer left running.
• Correct watch-directory scoping for bare package-name targets in a multi-package project.
• Building no longer fails for packages that use a custom prelude.
• Use the correct set of targets when constructing the build command.
• Surface location-less GHCi load failures (e.g. plugin errors) without reporting false positives.
• Clear stale diagnostics for failed executable and test Main modules.

[0.1.0.1] - 2026-06-06

Fixed

• Renamed the installed executable from tricorder-exe to tricorder so cabal install tricorder provides a binary matching the package name.

[0.1.0.0] - 2026-06-05

Added

• Initial release: daemon-based GHCi build monitor communicating over a Unix socket.
• Commands: start, stop, status [--wait], watch.
• status outputs structured JSON with build phase, module count, duration, and messages; each message includes severity, file, line/col, title (first line), and text (full body).
• Auto-detects cabal/stack projects and builds the cabal repl --enable-multi-repl command.
• Parses .cabal files to resolve hs-source-dirs for targeted file watching.
• Configurable via .tricorder.toml (targets, debounce, log file, etc.).
• File watcher with debouncing; auto-restarts the GHCi session on crash (fixes ghcid’s crash-on-file-removal bug).