Changelog

All notable changes to this project are documented here.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

0.15.0 - 06-Mar-2021

Changed

• Bump github.com/gdamore/tcell/v2 from 2.0.0 to 2.2.0.
• Bump github.com/mattn/go-runewidth from 0.0.9 to 0.0.10.
• Allowing CI to modify go.mod and go.sum when necessary.
• Executed go mod tidy.

Added

• TitleColor and TitleFocusedColor options for border title which enables the setting of separate colors for border and title on a container.

0.14.0 - 30-Dec-2020

Breaking API changes

• The widgetapi.Widget.Keyboard and widgetapi.Widget.Mouse methods now accepts a second argument which provides widgets with additional metadata. All widgets implemented outside of the termdash repository will need to be updated similarly to the Barchart example below. Change the original method signatures:

  func (*BarChart) Keyboard(k *terminalapi.Keyboard) error { ... }
  
  func (*BarChart) Mouse(m *terminalapi.Mouse) error { ... }
  
  

  By adding the new *widgetapi.EventMeta argument as follows:

  func (*BarChart) Keyboard(k *terminalapi.Keyboard, meta *widgetapi.EventMeta) error { ... }
  
  func (*BarChart) Mouse(m *terminalapi.Mouse, meta *widgetapi.EventMeta) error { ... }
  

Fixed

• termdash no longer crashes when tcell is used and the terminal window downsizes while content is being drawn.

Added

Text input form functionality with keyboard navigation

• added a new formdemo that demonstrates a text input form with keyboard navigation.

Infrastructure changes

• container now allows users to configure keyboard keys that move focus to the next or the previous container.
• containers can request to be skipped when focus is moved using keyboard keys.
• containers can register into separate focus groups and specific keyboard keys can be configured to move the focus within each focus group.
• widgets can now request keyboard events exclusively when focused.
• users can now set a container as focused using the new container.Focused option.

Updates to the button widget

• the button widget allows users to specify multiple trigger keys.
• the button widget now supports different keys for the global and focused scope.
• the button widget can now be drawn without the shadow or the press animation.
• the button widget can now be drawn without horizontal padding around its text.
• the button widget now allows specifying cell options for each cell of the displayed text. Separate cell options can be specified for each of button's main states (up, focused and up, down).
• the button widget allows specifying separate fill color values for each of its main states (up, focused and up, down).
• the button widget now has a method SetCallback that allows updating the callback function on an existing button instance.

Updates to the textinput widget

• the textinput widget can now be configured to request keyboard events exclusively when focused.
• the textinput widget can now be initialized with a default text in the input box.

0.13.0 - 17-Nov-2020

Added

• the Text widget now allows user to specify custom scroll marker runes.

Changed

• terminal cells now support font modifier options (bold, italic, underline, strike through).
• tcell dependency was upgraded to v2.0.0.
• upgraded versions of all other dependencies.
• aligned the definition of the first 16 colors with the definition used by Xterm and tcell. Defined two non-standard colors ColorMagenta and ColorCyan to make this change backward compatible for users that use termbox-go.
• made tcell terminal implementation the default in examples, demos and documentation.

Fixed

• coveralls again triggers and reports on PRs.
• addressed some lint issues.
• improved test coverage in some modules.
• changed the Blue color in demos to a more visible 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.
• Renamed directory internal to private so that external widget development is possible. Noted in 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 based terminal implementation which implements the terminalapi.Terminal interface.
• tcell implementation supports two initialization Options:
  • 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.