feat(git-bulk): Add compatibility to match workspaces using environnement variable

[pierreay]

Problem

With the current implementation of git-bulk (df53711 at the time of writing), using environment variables inside the ~/.gitconfig file to specify a bulk workspace works partially.

For example, let's say that $MYWORKSPACE is set to ~/myworkspace.
Let's say we use the following configuration in ~/.gitconfig:

[bulkworkspaces]
    myworkspace = $MYWORKSPACE

Next, what currently is working is the following command, using status as a demo command to test git-bulk:

git bulk -w myworkspace status

But what is not working is the following:

cd ~/myworkspace && git bulk status

However, it is expected to either work or not work in the both situations.

Rationale

I think it would be a good feature to have it working in both situations.
In this way, it would allow to easily use the same workspace name with different paths for different hosts, for example.

Solution

In the function that test whether our shell $PWD is in a workspace or not, I simply dereference variable values if there is any and I use the realpath of both $PWD and the workspace directory.
In addition to enabling full usage of environnement variable, this allows to match a workspace directory even if there is a mismatch between our $PWD and the workspace directory because of a symlink.

[pierreay]

I stumbled upon one difference of behavior between my PR and your upstream implementation.

Demonstration

Assuming we have this in the ~/.gitconfig:

[bulkworkspaces]
    workspace = ~/workspace
    workspace-inner = ~/workspace/inner

Assume we run the following commands:

cd ~/myworkspace && git bulk status
cd ~/myworkspace/inner && git bulk status
cd ~/myworkspace/inner/git-repo && git bulk status

• In the previous bulk implementation, all commands would use the workspace workspace.
• In my current implementation:

1. The first command would use the workspace workspace
2. The second command would use workspace-inner workspace.
3. The third command would complain that we are not inside a workspace (the workspace root, but we are in the workspace considering directories recursively).

Proposition

My current implementation is most intuitive for me... but I'm not the only one to use this. What do you think? While I'm suppose it is not a good idea to change the default of a command which is long used, maybe it would be great to add a flag to switch between the two behavior? It is a matter of changing only one test conditional.

Sticking to default behavior

Anyway, to stick to the default previous behavior of the command, I just have to change in bin/git-bulk:130 the == to =~.