Refactor MRU EXWM workspace using cycle/focus-previous!
Instead of consuming `cycle/previous-focus`, define a function `cycle/focus-previous!` that "focuses" the element at `previous-index` and returns that element. This function greatly simplified the code in window-manager.el and eliminated the unnecessary `exwm/previous-workspace` variable that was managing the state.
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2 changed files with 35 additions and 22 deletions
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@ -75,6 +75,19 @@
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(nth i (cycle-xs cycle))
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nil)))
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;; TODO: Consider adding "!" to the function name herein since many of them
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;; mutate the collection, and the APIs are beginning to confuse me.
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(defun cycle/focus-previous! (xs)
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"Jump to the item in XS that was most recently focused; return the cycle.
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This will error when previous-index is nil. This function mutates the
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underlying struct."
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(let ((i (cycle-previous-index xs)))
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(if (maybe/some? i)
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(progn
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(cycle/jump i xs)
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(cycle/current xs))
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(error "Cannot focus the previous element since cycle-previous-index is nil"))))
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(defun cycle/next (xs)
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"Return the next value in `XS' and update `current-index'."
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(let* ((current-index (cycle-current-index xs))
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@ -135,7 +148,8 @@
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(prelude/assert (= 1 (->> xs (cycle/jump 0) cycle/current)))
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(prelude/assert (= 2 (->> xs (cycle/jump 1) cycle/current)))
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(prelude/assert (= 3 (->> xs (cycle/jump 2) cycle/current)))
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(prelude/assert (= 2 (cycle/previous-focus xs)))))
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(prelude/assert (= 2 (cycle/previous-focus xs)))
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(prelude/assert (= 2 (cycle/focus-previous! xs)))))
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(provide 'cycle)
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;;; cycle.el ends here
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@ -249,22 +249,12 @@
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(defun exwm/next-workspace ()
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"Cycle forwards to the next workspace."
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(interactive)
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(exwm-workspace-switch
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(exwm/named-workspace-index (cycle/next exwm/workspaces)))
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(window-manager/alert
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(string/concat
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"Current workspace: "
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(exwm/named-workspace-label (cycle/current exwm/workspaces)))))
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(exwm/change-workspace (cycle/next exwm/workspaces)))
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(defun exwm/prev-workspace ()
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"Cycle backwards to the previous workspace."
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(interactive)
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(exwm-workspace-switch
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(exwm/named-workspace-index (cycle/prev exwm/workspaces)))
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(window-manager/alert
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(string/concat
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"Current workspace: "
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(exwm/named-workspace-label (cycle/current exwm/workspaces)))))
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(exwm/change-workspace (cycle/prev exwm/workspaces)))
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;; TODO: Create friendlier API for working with EXWM.
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@ -534,17 +524,26 @@ Currently using super- as the prefix for switching workspaces."
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(kbd/for 'workspace (s-capitalize key))
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handler)))
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(defun exwm/change-workspace (workspace)
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"Switch EXWM workspaces to the WORKSPACE struct."
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(exwm-workspace-switch (exwm/named-workspace-index workspace))
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(window-manager/alert
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(string/format "Switched to: %s" (exwm/named-workspace-label workspace))))
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(defun exwm/switch (label)
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"Switch to a named workspaces using LABEL."
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(cycle/focus
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(lambda (x)
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(equal label
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(exwm/named-workspace-label x)))
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exwm/workspaces)
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(exwm-workspace-switch
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(exwm/named-workspace-index (cycle/current exwm/workspaces)))
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(window-manager/alert
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(string/concat "Switched to: " label)))
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(cycle/focus (lambda (x)
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(equal label
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(exwm/named-workspace-label x)))
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exwm/workspaces)
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(exwm/change-workspace (cycle/current exwm/workspaces)))
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;; TODO: Assign an easy-to-remember keybinding to this.
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(exwm-input-set-key (kbd "C-S-f") #'exwm/toggle-previous)
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(defun exwm/toggle-previous ()
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"Focus the previously active EXWM workspace."
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(interactive)
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(exwm/change-workspace (cycle/focus-previous! exwm/workspaces)))
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(defun exwm/ivy-switch ()
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"Use ivy to switched between named workspaces."
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