215 lines
8.5 KiB
EmacsLisp
215 lines
8.5 KiB
EmacsLisp
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;;; eshell-starship.el --- Starship-like (https://starship.rs) prompt for eshell
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;;; Commentary:
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;;; Code:
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(require 'vc)
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(require 'vc-git)
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(require 'eshell)
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(defun eshell-starship--git-process-lines (&rest flags)
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"Run `vc-git-program' and return an array of its output lines.
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FLAGS are passed to `vc-git-program' as its arguments."
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(with-temp-buffer
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(apply 'vc-git-command t 0 nil flags)
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(if (zerop (buffer-size))
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'()
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(string-lines (buffer-substring-no-properties 1 (buffer-size))))))
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(defun eshell-starship--replace-home-with-tilda (path)
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"If PATH beings with $HOME (the environment variable), replace it with ~."
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(let ((home (getenv "HOME")))
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(if (equal home path)
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"~"
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(setq home (file-name-as-directory home))
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(if (string-prefix-p home path)
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(concat "~/" (seq-subseq path (length home)))
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path))))
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(defun eshell-starship--prompt-cut-path (num path)
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"Cut PATH down to NUM components.
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Example:
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/this/is/a/path 3-> is/a/path"
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(let ((parts (string-split path "/" t nil)))
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(concat
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(when (and (file-name-absolute-p path)
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(not (equal "~" (car parts)))
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(<= (length parts) num))
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"/")
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(string-join (last parts num) "/"))))
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(defun eshell-starship--prompt-get-dir ()
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"Get dir for `eshell-starship--prompt-function'."
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(eshell-starship--prompt-cut-path 3
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(if-let ((worktree (vc-root-dir))
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(parent (file-name-parent-directory worktree)))
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(file-relative-name default-directory parent)
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(eshell-starship--replace-home-with-tilda default-directory))))
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(defun eshell-starship--prompt-status-char-for-branch (branch remote)
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"Get the status char representing the relation between BRANCH and REMOTE."
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(let ((lines (eshell-starship--git-process-lines
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"rev-list"
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"--left-right"
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(concat branch "..." remote)))
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(to-remote nil)
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(to-local nil))
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(dolist (line lines)
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(if-let (((not (string-empty-p line)))
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(dir-char (aref line 0)))
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(if (= dir-char ?<)
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(setq to-remote t)
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(setq to-local t))))
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(cond
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((and to-remote to-local) ?)
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(to-remote ?)
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(to-local ?))))
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(defun eshell-starship--prompt-current-branch-status ()
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"Get the status char for the current branch and its remote."
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(let ((refs (eshell-starship--git-process-lines
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"for-each-ref"
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"--format=%(HEAD)%00%(refname:short)%00%(upstream:short)"
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"refs/heads")))
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(catch 'break
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(dolist (ref refs)
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(if-let ((split-ref (split-string ref "\0" nil nil))
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((equal (car split-ref) "*")))
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(throw 'break (eshell-starship--prompt-status-char-for-branch
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(cadr split-ref)
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(caddr split-ref))))))))
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(defun eshell-starship--prompt-git-state-chars ()
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"Get chars, like + and ✘ for `eshell-starship--prompt-function'."
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(let ((lines (eshell-starship--git-process-lines "status" "--porcelain=v1"))
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(branch-status (eshell-starship--prompt-current-branch-status))
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(status-arr))
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(dolist (line lines)
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(cl-loop with fields = (string-split line " " t " *")
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with status-str = (car-safe fields)
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for status-char across status-str
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do
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(cond ((or (= status-char ?M) (= status-char ?T))
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(add-to-list 'status-arr ?!))
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((= status-char ??)
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(add-to-list 'status-arr ??))
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((or (= status-char ?A) (= status-char ?C))
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(add-to-list 'status-arr ?+))
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((= status-char ?D)
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(add-to-list 'status-arr ?))
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((= status-char ?R)
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(add-to-list 'status-arr ?»))
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((= status-char ?U)
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(add-to-list 'status-arr ?=)))))
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(sort status-arr #'<)
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(when branch-status
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(push branch-status status-arr))
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(apply 'string status-arr)))
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(defun eshell-starship--prompt-git-get-operation ()
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"Return the current git operation. For example, a revert."
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(let ((git-dir (expand-file-name ".git" (vc-git-root default-directory))))
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(cond
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((file-exists-p (expand-file-name "REVERT_HEAD" git-dir))
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"REVERTING")
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((file-exists-p (expand-file-name "rebase-merge" git-dir))
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"REBASING")
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((file-exists-p (expand-file-name "MERGE_HEAD" git-dir))
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"MERGING"))))
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(defun eshell-starship--prompt-git-status ()
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"Get git status for `eshell-starship--prompt-function'."
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(let ((branch (car (vc-git-branches)))
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(state (eshell-starship--prompt-git-state-chars))
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(operation (eshell-starship--prompt-git-get-operation)))
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(concat
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(propertize (concat " " branch) 'face '(:foreground "medium purple"))
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(unless (string-empty-p state)
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(propertize (concat " [" state "]") 'face '(:foreground "red")))
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(when operation
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(concat " (" (propertize operation 'face
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'(:inherit 'bold :foreground "yellow")) ")")))))
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(defun eshell-starship--prompt-vc-status ()
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"Get vc status for `eshell-starship--prompt-function'."
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(if-let (backend (vc-responsible-backend default-directory t))
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(if (eq backend 'Git)
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(eshell-starship--prompt-git-status)
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(propertize
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(concat " " (downcase (symbol-name backend)))
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'face '(:foreground "purple")))))
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(defvar-local eshell-starship--prompt-last-start-time nil
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"Start time of last eshell command.")
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(defun eshell-starship--prompt-timer-pre-cmd ()
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"Command run before each eshell program to record the time."
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(setq eshell-starship--prompt-last-start-time (current-time)))
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(add-hook 'eshell-pre-command-hook #'eshell-starship--prompt-timer-pre-cmd)
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(defun eshell-starship--prompt-format-span (span)
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"Format SPAN as \"XhXms\"."
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(let* ((hours (/ span 3600))
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(mins (% (/ span 60) 60))
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(secs (% span 60)))
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(concat (unless (= hours 0)
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(format "%dh" hours))
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(unless (= mins 0)
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(format "%dm" mins))
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(format "%ds" secs))))
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(defun eshell-starship--prompt-last-command-time (end-time)
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"Return the prompt component for the time of the last command.
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END-TIME is the time when the command finished executing."
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(if-let ((eshell-starship--prompt-last-start-time)
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(len (time-subtract end-time
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eshell-starship--prompt-last-start-time))
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(float-len (float-time len))
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((< 3 float-len))
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(int-len (round float-len)))
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(concat " time "
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(propertize (eshell-starship--prompt-format-span int-len)
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'face '(:foreground "gold1")))))
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(defun eshell-starship--prompt-function ()
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"Function for `eshell-prompt-function'."
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(let* ((end-time (current-time))
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(dir (eshell-starship--prompt-get-dir))
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(prompt (concat
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"\n"
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(propertize dir 'face '(:foreground "dark turquoise"))
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(unless (file-writable-p dir)
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" ")
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(eshell-starship--prompt-vc-status)
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(eshell-starship--prompt-last-command-time end-time)
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(propertize "\n" 'read-only t 'rear-nonsticky t)
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(propertize
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"❯ " 'face `(:foreground
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,(if (= eshell-last-command-status 0)
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"lime green"
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"red"))
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'rear-nonsticky t))))
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(setq eshell-starship--prompt-last-start-time nil)
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prompt))
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(defvar-local ehsell-starship--restore-state nil
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"State of various variables set by `eshell-starship-prompt-mode'.")
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;;;###autoload
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(define-minor-mode eshell-starship-prompt-mode
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"Minor mode to make eshell prompts look like starship (https://starship.rs)"
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:global nil
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:init-value nil
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:interactive (eshell-mode)
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(if eshell-starship-prompt-mode
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(setq-local eshell-starship--restore-state
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(buffer-local-set-state eshell-prompt-function
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'eshell-starship--prompt-function
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eshell-prompt-regexp "^❯ "
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eshell-highlight-prompt nil))
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(buffer-local-restore-state eshell-starship--restore-state)))
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(provide 'eshell-starship)
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;;; eshell-starship.el ends here
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