98 lines
3.1 KiB
EmacsLisp
98 lines
3.1 KiB
EmacsLisp
;;; comint-ledger.el --- Command interpreter for the Ledger CLI -*- lexical-binding: t; -*-
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;; Author: Bram Schoenmakers
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;; URL: https://apps.bram85.nl/git/bram/comint-ledger
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;; Version: 0.1
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;; Keywords: processes
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;; Package-Requires: ((emacs "28.1"))
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;;; This file is NOT part of GNU Emacs
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;;; Commentary:
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;;
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;; Command interpreter (comint) for the Ledger CLI tool.
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;; Starting point for this mode is Mickey Petersen's article on writing comint modes.
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;;
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;; https://www.masteringemacs.org/article/comint-writing-command-interpreter
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;;
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;;; Code:
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(require 'comint)
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(defvar ledger-cli-path (executable-find "ledger")
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"Path to the program used by `run-ledger'.")
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(defvar ledger-file-path nil
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"Path to the ledger data file.")
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(defvar ledger-cli-arguments '()
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"Commandline arguments to pass to `ledger'.")
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(defvar ledger-mode-map
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(let ((map (nconc (make-sparse-keymap) comint-mode-map)))
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;; example definition
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(define-key map "\t" 'completion-at-point)
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map)
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"Basic mode map for `run-ledger'.")
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(defvar ledger-prompt-regexp (rx bol "] ")
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"Prompt for `run-ledger'.")
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(defvar ledger-buffer-name "*Ledger*"
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"Name of the buffer to use for the `run-ledger' comint instance.")
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;;;###autoload
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(defun run-ledger ()
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"Run an inferior instance of `ledger' inside Emacs."
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(interactive)
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(let* ((ledger-program ledger-cli-path)
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(ledger-file-arguments (list "-f" ledger-file-path))
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(ledger-arguments (append ledger-file-arguments ledger-cli-arguments))
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(buffer (get-buffer-create ledger-buffer-name))
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(proc-alive (comint-check-proc buffer)))
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;; if the process is dead then re-create the process and reset the
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;; mode.
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(unless proc-alive
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(with-current-buffer buffer
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(apply 'make-comint-in-buffer "Ledger" buffer
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ledger-program nil ledger-arguments)
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(comint-ledger-mode)))
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;; Regardless, provided we have a valid buffer, we pop to it.
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(when buffer
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(pop-to-buffer buffer))))
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(defun ledger--initialize ()
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"Helper function to initialize ledger."
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(setq comint-process-echoes t)
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(setq comint-use-prompt-regexp t))
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(define-derived-mode comint-ledger-mode comint-mode "comint-ledger"
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"Major mode for `run-ledger'.
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\\<ledger-mode-map>"
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;; this sets up the prompt so it matches things like: [foo@bar]
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(setq comint-prompt-regexp ledger-prompt-regexp)
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;; this makes it read only; a contentious subject as some prefer the
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;; buffer to be overwritable.
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(setq comint-prompt-read-only t)
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;; this makes it so commands like M-{ and M-} work.
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(set (make-local-variable 'paragraph-separate) "\\'")
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(set (make-local-variable 'font-lock-defaults) '(ledger-font-lock-keywords t))
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(set (make-local-variable 'paragraph-start) ledger-prompt-regexp))
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(add-hook 'ledger-mode-hook 'ledger--initialize)
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(defconst ledger-keywords
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'()
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"List of keywords to highlight in `ledger-font-lock-keywords'.")
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(defvar ledger-font-lock-keywords
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(list
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;; highlight all the reserved commands.
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`(,(concat "\\_<" (regexp-opt ledger-keywords) "\\_>") . font-lock-keyword-face))
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"Additional expressions to highlight in `comint-ledger-mode'.")
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(provide 'comint-ledger)
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;;; comint-ledger.el ends here
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