* fix: don't invoke asdf inside asdf commands
Recursive calls have a number of disadvantages:
* Poorer performance since each invocation spawns and new process and re-executes all the code in bin/asdf
* Makes debugging more difficult
* More likely to introduce subtle bugs and the possibility for infinite loops
* Ban `ls` command
* Update banned commands test so it only checks bash and sh files
* Only allow `ls` for resolving symlinks
* Replace `ls` commands with `find`
* feat: Displays a warning when the plugin from the tools-version does not exist
When calling the install command, it tried to look for versions for all
the plugins available and installed them. With this change, it will attempt to
find versions for all the installed plugins and plugins defined in the
`.tool-versions`.
Fixes https://github.com/asdf-vm/asdf/issues/574
* feat: Changes the algorithm to detect not installed plugins
This patch changes the algorithm. It preserves the original logic for
the plugin resolution, but at the same time, reports entries with plugins not
available.
* fix: Addresses the pull request comments.
- Changes the comparison to be strict rather than partial.
- Prints a list of missing plugins.
- Exists if at least one plugin is not present.
- Adds unit tests.
`asdf install <name>` installs that single tool at the version specified
in `.tool-versions`. If there is no `.tool-versions` or if that tool is
not in it, an error message is shown and `asdf` exits `1`.
Implements #759
