_frontend: Allow printing dependencies using `bst show`
At present, there isn't an easy way to print anything from bst show
that would give the users an idea of what the dependency graph looks
like. One could use things like --deps build, but that will just print
a list, without any information about the dependency edges.
Add %{deps}, %{build-deps} and %{runtime-deps} format strings to
bst show that would simply print the list of all dependencies, build
dependencies and runtime dependencies respectively.
Summary of changes:
- buildstream/_frontend/cli.py: Add help for new format symbols.
- buildstream/_frontend/widget.py: Add support for new format symbols for dependencies.
- tests/frontend/show.py: Add tests for new format symbols.
Fixes #890 (closed).
Edited by Chandan Singh