allow cleaning of specific source directory

[rmarquis]

Currently, pacaur -Sc and -Scc as an AUR extension also cleans the AUR sources, provided SRCDEST is defined. This removes the non development packages source files and all source files, respectively, but removing a single package source (which is somewhat problematic) can only be done manually.

Implement -Sc <pkg> or -Scc <pkg> to remove this specific package sources without the need to do a manual intervention in ~/.cache/pacaur.

This is an extension of #559 and #461.

Also add a clean and cleanall commands as AUR only operation somehow, as part of #712.

[rmarquis]

WIP implementation proposal of the clean prompts.

There are 3 types of files to clean:

• Built packages
• Source packages
• Clone files

Built packages (CacheDir)

• only when $PKGDEST is defined in conjunction with CacheDir
• only done through pacman built-in -Sc, -Scc

Built packages

• only when $PKGDEST is defined but not defined in CacheDir
• removal of all uninstalled packages with -Sca and clean
• removal of ALL packages with -Scca and cleanall

Source packages

• only when $SRCDEST is defined
• removal of all non development files with -Sca and clean
• removal of a specific development source (and related untracked files if $SRCDEST/$PKGDEST are not defined) with -Sca <pkgname> and clean <pkgname> (not possible to implement)
• removal of ALL files with -Scca and cleanall

Clones files

• always available
• removal of all uninstalled clones (AND all other untracked files if $SRCDEST/$PKGDEST are not defined) with -Sca and clean
• removal of a specific clone (and related untracked files if $SRCDEST/$PKGDEST are not defined) with -Sca <pkgname> and clean <pkgname>
• removal of all clones with -Scca and cleanall

[rmarquis]

Source packages

removal of a specific development source (and related untracked files if $SRCDEST/$PKGDEST are not defined) with -Sca and clean

This isn't possible to implement, since the source files/directory might not be the same as the pkgbase. Some projects even use more than one directory for their source.

Removal of specfic target can be done for clone files only, where sources will be removed too if $SRCDEST isn't defined.

[rmarquis]

Done in c0bc632.