on-workspace-touched/on-workspace-redraw callback

[nikitabobko]

The proposal is to introduce on-workspace-touched callback. When the workspace is updated in any way (focused changed to/from the workspace, children are attached/removed, name/tag is changed (oh,fuck, see below))

Use case:

on-workspace-touched = 'echo %{workspace-mru-app-name} | xargs rename-workspace --tag'

It'd require introduction of workspace-mru-app-name interpolation variable ("MRU" stands for "most recently used")

Alternative names: on-workspace-used (similar to "MRU"), on-workspace-updated (Does "focusing the workspace" update it?)

Alternative. Allow interpolation variables directly inside rename-workspace? rename-workspace --tag %{workspace-mru-app-name}. Then, for the consistency, they should be allowed in literally all commands. workspace %{next-workspace}, focus --window-id %{left-window-id}, etc. jeez

Problem. Any command run inside the callback will probably change the workspace again. rename-workspace changes the workspace, which leads to infinite loop.

Possible solutions:

• More fine-grained callback. on-workspace-children-changed (sounds too specific. Is it useful in general case?)
• Detect changes from the callback itself, and don't retrigger recursively. Sounds the most promising
• Don't do anything with this problem. Assume that the script inside is idempotent, which will cause recursion only once I completely dislike it. At least because commands need to make sure no to call the callback if they detect that they noop

Depends on: #245 #278

[nikitabobko]

To consider:

• on-workspace-tree-updated
• on-refresh (after each "refresh session")
• on-workspace-redraw