Ignore composer-plugin-api (and exclude packages) from reported packages

[icanhazstring]

Describe the bug

With latest rebuild for ersion 0.8 there a still some implementations missing: like exclude packages. (with the --excludePackageoption)

If you are using composer-unused for any composer plugin (or even composer-unused itself), the composer-plugin-api package is required but does not actually ship any code. This should be also added to excluded Packages.

These types of packages should be removed here:
https://github.com/composer-unused/composer-unused/blob/main/src/Console/Command/UnusedCommand.php#L101

[icanhazstring]

± |main {6} ✓| → ./build/composer-unused.phar --excludeDir=data
Plugin command unused (Icanhazstring\Composer\Unused\Command\UnusedCommand) would override a Composer command and has been skipped

Loading packages
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 ! [NOTE] Found 5 package(s) to be checked.                                                                             

Scanning files from basedir /Users/andreas.froemer/Projects/composer-unused/composer-unused
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 35/35 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%

Results
-------

Found 5 used, 0 unused and 1 ignored packages

 Used packages
 ✓ php
 ✓ composer-unused/symbol-parser
 ✓ nikic/php-parser
 ✓ psr/container
 ✓ psr/log

 Unused packages

 Ignored packages
 ○ composer-plugin-api (Unable to locate package) <- this should not be listed

[verenaroe]

I would add a filter here

composer-unused/src/Console/Command/UnusedCommand.php

Line 94 in ccffcc7

// TODO add excludes

to always exclude composer-plugin-api and merge it with existing exclusions from the --excludePackage option. I would create an array of packages which should always be excluded that can be extended in the future. What do you think?

[icanhazstring]

Hi @verenaroe. Yes, this would be a good way. Go ahead :)
And thanks in advance 💪

[icanhazstring]

We might also add some actual rules which are used to ignore packages.
For example:

• PatternExclusion
• NamedExclusion

This way we can make sure, that we can also exclude packages by pattern, e.g. *-implementation (as mentioned in #93)
and also directly named packages using the --excludePackage option.

[icanhazstring]

@verenaroe if you need any help. Let me know.