Add new operation: CI-Check

[mautamu]

Howdy,

To prevent issues like leftwm/leftwm#436 and leftwm/leftwm-community-themes#25, we should add a CI operation for leftwm-community-themes that performs the following checks:

• [ ] Known.toml is valid TOML
• [ ] Runs the change operations (See #9) to make sure none of them need applied to known.toml itself (e.g. a Change to name Sunflower to sunflower, but the known.toml has a theme named Sunflower)
• [ ] Checks that all names are unique
• [ ] Checks that all Change UUIDs are unique
• [ ] Checks that all theme names match the currently acceptable requirements
• [ ] Checks that the theme repository exists (download it)
• [ ] Checks that the theme repository contains up, down, and theme.toml at a minimum (use relative_directory, and download as per above)
• [ ] Warns (with flag --new-versions or similar) of outdated commits
• [ ] Sets (with flag --set-versions or similar) the version of each theme equal to the current commit HEAD tag
• [ ] Sets (with flag --set-commit or similar) the commit of each theme equal to the current commit HEAD sum Bonus:
• [ ] Find a way to determine the minimum leftwm version and set that

Example:

[leftwm-community-themes@leftwm ~]$ leftwm-theme ci-check
[OK] known.toml valid
[OK] all changes are applied
[OK] all changes have unique ID
[OK] all themes have unique name
[OK] all themes have an acceptable name
[1/2] Checking theme `sunflower`
    => Repository downloaded successfully
    => Contains up with proper permissions
    => Contains down with proper permissions
    => Contains valid theme.toml with proper permissions
[2/2] Checking theme `soothe` in `soothe/theme/`
    => Repository downloaded successfully
    => Sub-directory entered successfully
    => Contains up with proper permissions
    => Contains down with proper permissions
    => Contains valid theme.toml with proper permissions

Example 2 (with flags):

[leftwm-community-themes@leftwm ~]$ leftwm-theme ci-check --set-versions --set-commit
[OK] known.toml valid
[OK] all changes are applied
[OK] all changes have unique ID
[OK] all themes have unique name
[OK] all themes have an acceptable name
[1/2] Checking theme `sunflower`
    => Repository downloaded successfully
    => Contains up with proper permissions
    => Contains down with proper permissions
    => Contains valid theme.toml with proper permissions
    => Version upgraded from 0.0.1 to 0.1.0
    => Commit set to 9c504d9
[2/2] Checking theme `soothe` in `soothe/theme/`
    => Repository downloaded successfully
    => Sub-directory entered successfully
    => Contains up with proper permissions
    => Contains down with proper permissions
    => Contains valid theme.toml with proper permissions
    => Version remains 0.1.0
    => Commit set to 643ad4e

Example 3 (errors):

[leftwm-community-themes@leftwm ~]$ leftwm-theme ci-check
[Err] known.toml valid:
  Error: Unknown character ~, line 1, column 1. TOML could not be parsed.

Example 4 (errors):

[leftwm-community-themes@leftwm ~]$ leftwm-theme ci-check --set-versions --set-commit
[OK] known.toml valid
[Err] all changes are applied
  Error: theme "Soothe" not renamed to "soothe"
  Help: change name="Soothe" to name="soothe"
[Err] all changes have unique ID
  Error: change (uuid1) is not unique
  Help: insert new UUID for uuid1
[Err] all themes have unique name
  Error: theme "sunflower" is defined twice.
  Help: rename all but one instance of "sunflower", or delete duplicate entries.
[Err] all themes have an acceptable name
  Error: theme "Soothe" does not have an acceptable name.

[mautamu]

(feel free to follow a different style for errors, this is just a suggestion. it would be helpful to maybe follow the style of leftwm-check).

[VuiMuich]

I'd like to suggest some additional checks:

• [ ] theme.toml is parsable
• [ ] up and down scripts have proper permissions
• [ ] up script symlinks or copies down script to /tmp/leftwm-down-theme, as this will be the place other themes will look for a down script
• [ ] up and down scripts have a shebang and leftwm command "LoadTheme in up or leftwm command "UnloadTheme" in down (not sure if export SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )" and the use of it in LoadTheme should be enforced as well?)

[mautamu]

Blocked on leftwm/leftwm#496