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# Changelog
All notable changes to this project are documented here.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [Unreleased]
### Added
- the `Text` widget now allows user to specify custom scroll marker runes.
### Changed
- `tcell` dependency was upgraded 1.4.0.
- made `tcell` terminal implementation the default in examples, demos and
documentation.
- upgrading versions on all dependencies.
- terminal cells now support font modifier options (bold, italic,
underline, strikethrough).
### Fixed
- addressing some lint issues.
- coveralls again triggers and reports on PRs.
- improving test coverage in some modules.
- changing the Blue color in demos to a more readable shade.
- fixed a bug where segment display text in `termdashdemo` appeared to be
jumping.
## [0.12.2] - 31-Aug-2020
### Fixed
- advanced the CI Go versions up to Go 1.15.
- fixed the build status badge to correctly point to travis-ci.com instead of
travis-ci.org.
## [0.12.1] - 20-Jun-2020
### Fixed
- the `tcell` unit test can now pass in headless mode (when TERM="") which
happens under bazel.
- switching coveralls integration to Github application.
## [0.12.0] - 10-Apr-2020
### Added
- Migrating to [Go modules](https://blog.golang.org/using-go-modules).
- Renamed directory `internal` to `private` so that external widget development
is possible. Noted in
[README.md](https://github.com/mum4k/termdash/blob/master/README.md) that packages in the
`private` directory don't have any API stability guarantee.
## [0.11.0] - 7-Mar-2020
#### Breaking API changes
- Termdash now requires at least Go version 1.11.
### Added
- New [`tcell`](https://github.com/gdamore/tcell) based terminal implementation
which implements the `terminalapi.Terminal` interface.
- tcell implementation supports two initialization `Option`s:
- `ColorMode` the terminal color output mode (defaults to 256 color mode)
- `ClearStyle` the foreground and background color style to use when clearing
the screen (defaults to the global ColorDefault for both foreground and
background)
### Fixed
- Improved test coverage of the `Gauge` widget.
## [0.10.0] - 5-Jun-2019
### Added
- Added `time.Duration` based `ValueFormatter` for the `LineChart` Y-axis labels.
- Added round and suffix `ValueFormatter` for the `LineChart` Y-axis labels.
- Added decimal and suffix `ValueFormatter` for the `LineChart` Y-axis labels.
- Added a `container.SplitOption` that allows fixed size container splits.
- Added `grid` functions that allow fixed size rows and columns.
### Changed
- The `LineChart` can format the labels on the Y-axis with a `ValueFormatter`.
- The `SegmentDisplay` can now display dots and colons ('.' and ':').
- The `Donut` widget now guarantees spacing between the donut and its label.
- The continuous build on Travis CI now builds with cgo explicitly disabled to
ensure both Termdash and its dependencies use pure Go.
### Fixed
- Lint issues found on the Go report card.
- An internal library belonging to the `Text` widget was incorrectly passing
`math.MaxUint32` as an int argument.
## [0.9.1] - 15-May-2019
### Fixed
- Termdash could deadlock when a `Button` or a `TextInput` was configured to
call the `Container.Update` method.
## [0.9.0] - 28-Apr-2019
### Added
- The `TextInput` widget, an input field allowing interactive text input.
- The `Donut` widget can now display an optional text label under the donut.
### Changed
- Widgets now get information whether their container is focused when Draw is
executed.
- The SegmentDisplay widget now has a method that returns the observed character
capacity the last time Draw was called.
- The grid.Builder API now allows users to specify options for intermediate
containers, i.e. containers that don't have widgets, but represent rows and
columns.
- Line chart widget now allows `math.NaN` values to represent "no value" (values
that will not be rendered) in the values slice.
#### Breaking API changes
- The widgetapi.Widget.Draw method now accepts a second argument which provides
widgets with additional metadata. This affects all implemented widgets.
- Termdash now requires at least Go version 1.10, which allows us to utilize
`math.Round` instead of our own implementation and `strings.Builder` instead
of `bytes.Buffer`.
- Terminal shortcuts like `Ctrl-A` no longer come as two separate events,
Termdash now mirrors termbox-go and sends these as one event.
## [0.8.0] - 30-Mar-2019
### Added
- New API for building layouts, a grid.Builder. Allows defining the layout
iteratively as repetitive Elements, Rows and Columns.
- Containers now support margin around them and padding of their content.
- Container now supports dynamic layout changes via the new Update method.
### Changed
- The Text widget now supports content wrapping on word boundaries.
- The BarChart and SparkLine widgets now have a method that returns the
observed value capacity the last time Draw was called.
- Moving widgetapi out of the internal directory to allow external users to
develop their own widgets.
- Event delivery to widgets now has a stable defined order and happens when the
container is unlocked so that widgets can trigger dynamic layout changes.
### Fixed
- The termdash_test now correctly waits until all subscribers processed events,
not just received them.
- Container focus tracker now correctly tracks focus changes in enlarged areas,
i.e. when the terminal size increased.
- The BarChart, LineChart and SegmentDisplay widgets now protect against
external mutation of the values passed into them by copying the data they
receive.
## [0.7.2] - 25-Feb-2019
### Added
- Test coverage for data only packages.
### Changed
- Refactoring packages that contained a mix of public and internal identifiers.
#### Breaking API changes
The following packages were refactored, no impact is expected as the removed
identifiers shouldn't be used externally.
- Functions align.Text and align.Rectangle were moved to a new
internal/alignfor package.
- Types cell.Cell and cell.Buffer were moved into a new internal/canvas/buffer
package.
## [0.7.1] - 24-Feb-2019
### Fixed
- Some of the packages that were moved into internal are required externally.
This release makes them available again.
### Changed
#### Breaking API changes
- The draw.LineStyle enum was refactored into its own package
linestyle.LineStyle. Users will have to replace:
- draw.LineStyleNone -> linestyle.None
- draw.LineStyleLight -> linestyle.Light
- draw.LineStyleDouble -> linestyle.Double
- draw.LineStyleRound -> linestyle.Round
## [0.7.0] - 24-Feb-2019
### Added
#### New widgets
- The Button widget.
#### Improvements to documentation
- Clearly marked the public API surface by moving private packages into
internal directory.
- Started a GitHub wiki for Termdash.
#### Improvements to the LineChart widget
- The LineChart widget can display X axis labels in vertical orientation.
- The LineChart widget allows the user to specify a custom scale for the Y
axis.
- The LineChart widget now has an option that disables scaling of the X axis.
Useful for applications that want to continuously feed data and make them
"roll" through the linechart.
- The LineChart widget now has a method that returns the observed capacity of
the LineChart the last time Draw was called.
- The LineChart widget now supports zoom of the content triggered by mouse
events.
#### Improvements to the Text widget
- The Text widget now has a Write option that atomically replaces the entire
text content.
#### Improvements to the infrastructure
- A function that draws text vertically.
- A non-blocking event distribution system that can throttle repetitive events.
- Generalized mouse button FSM for use in widgets that need to track mouse
button clicks.
### Changed
- Termbox is now initialized in 256 color mode by default.
- The infrastructure now uses the non-blocking event distribution system to
distribute events to subscribers. Each widget is now an individual
subscriber.
- The infrastructure now throttles event driven screen redraw rather than
redrawing for each input event.
- Widgets can now specify the scope at which they want to receive keyboard and
mouse events.
#### Breaking API changes
##### High impact
- The constructors of all the widgets now also return an error so that they
can validate the options. This is a breaking change for the following
widgets: BarChart, Gauge, LineChart, SparkLine, Text. The callers will have
to handle the returned error.
##### Low impact
- The container package no longer exports separate methods to receive Keyboard
and Mouse events which were replaced by a Subscribe method for the event
distribution system. This shouldn't affect users as the removed methods
aren't needed by container users.
- The widgetapi.Options struct now uses an enum instead of a boolean when
widget specifies if it wants keyboard or mouse events. This only impacts
development of new widgets.
### Fixed
- The LineChart widget now correctly determines the Y axis scale when multiple
series are provided.
- Lint issues in the codebase, and updated Travis configuration so that golint
is executed on every run.
- Termdash now correctly starts in locales like zh_CN.UTF-8 where some of the
characters it uses internally can have ambiguous width.
## [0.6.1] - 12-Feb-2019
### Fixed
- The LineChart widget now correctly places custom labels.
## [0.6.0] - 07-Feb-2019
### Added
- The SegmentDisplay widget.
- A CHANGELOG.
- New line styles for borders.
### Changed
- Better recordings of the individual demos.
### Fixed
- The LineChart now has an option to change the behavior of the Y axis from
zero anchored to adaptive.
- Lint errors reported on the Go report card.
- Widgets now correctly handle a race when new user data are supplied between
calls to their Options() and Draw() methods.
## [0.5.0] - 21-Jan-2019
### Added
- Draw primitives for drawing circles.
- The Donut widget.
### Fixed
- Bugfixes in the braille canvas.
- Lint errors reported on the Go report card.
- Flaky behavior in termdash_test.
## [0.4.0] - 15-Jan-2019
### Added
- 256 color support.
- Variable size container splits.
- A more complete demo of the functionality.
### Changed
- Updated documentation and README.
## [0.3.0] - 13-Jan-2019
### Added
- Primitives for drawing lines.
- Implementation of a Braille canvas.
- The LineChart widget.
## [0.2.0] - 02-Jul-2018
### Added
- The SparkLine widget.
- The BarChart widget.
- Manually triggered redraw.
- Travis now checks for presence of licence headers.
### Fixed
- Fixing races in termdash_test.
## 0.1.0 - 13-Jun-2018
### Added
- Documentation of the project and its goals.
- Drawing infrastructure.
- Testing infrastructure.
- The Gauge widget.
- The Text widget.
[unreleased]: https://github.com/mum4k/termdash/compare/v0.12.2...devel
[0.12.2]: https://github.com/mum4k/termdash/compare/v0.12.1...v0.12.2
[0.12.1]: https://github.com/mum4k/termdash/compare/v0.12.0...v0.12.1
[0.12.0]: https://github.com/mum4k/termdash/compare/v0.11.0...v0.12.0
[0.11.0]: https://github.com/mum4k/termdash/compare/v0.10.0...v0.11.0
[0.10.0]: https://github.com/mum4k/termdash/compare/v0.9.1...v0.10.0
[0.9.1]: https://github.com/mum4k/termdash/compare/v0.9.0...v0.9.1
[0.9.0]: https://github.com/mum4k/termdash/compare/v0.8.0...v0.9.0
[0.8.0]: https://github.com/mum4k/termdash/compare/v0.7.2...v0.8.0
[0.7.2]: https://github.com/mum4k/termdash/compare/v0.7.1...v0.7.2
[0.7.1]: https://github.com/mum4k/termdash/compare/v0.7.0...v0.7.1
[0.7.0]: https://github.com/mum4k/termdash/compare/v0.6.1...v0.7.0
[0.6.1]: https://github.com/mum4k/termdash/compare/v0.6.0...v0.6.1
[0.6.0]: https://github.com/mum4k/termdash/compare/v0.5.0...v0.6.0
[0.5.0]: https://github.com/mum4k/termdash/compare/v0.4.0...v0.5.0
[0.4.0]: https://github.com/mum4k/termdash/compare/v0.3.0...v0.4.0
[0.3.0]: https://github.com/mum4k/termdash/compare/v0.2.0...v0.3.0
[0.2.0]: https://github.com/mum4k/termdash/compare/v0.1.0...v0.2.0
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