136 lines
5.9 KiB
EmacsLisp
136 lines
5.9 KiB
EmacsLisp
;; -*- lexical-binding: t; -*-
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;; Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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;; Released under Apache 2.0 license as described in the file LICENSE.
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;;
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;; Author: Soonho Kong
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;;
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(require 'cl-lib)
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(require 'dash)
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(require 'lean-server)
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(require 'lean-debug)
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(defvar-local lean-changed-lines nil
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"Changed lines")
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(defvar-local lean-removed-lines nil
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"Removed lines")
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(defvar-local lean-inserted-lines nil
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"Inserted lines")
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(defun lean-before-change-function (beg end)
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"Function attached to before-change-functions hook.
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It saves the following information to the global variable:
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- lean-global-before-change-beg : beg
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- lean-global-before-change-end : end
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- lean-global-before-change-beg-line-number : line-number of beg
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- lean-global-before-change-end-line-number : line-number of end
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- lean-global-before-change-text : text between beg and end
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These information will be used by lean-after-changed-function."
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(lean-server-get-process)
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(setq lean-global-before-change-beg beg)
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(setq lean-global-before-change-end end)
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(setq lean-global-before-change-beg-line-number (line-number-at-pos beg))
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(setq lean-global-before-change-end-line-number (line-number-at-pos end))
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(setq lean-global-before-change-text (buffer-substring-no-properties beg end)))
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(defun lean-after-change-diff-lines (before-beg-line-number
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before-end-line-number
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after-beg-line-number
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after-end-line-number)
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"Given before and after (beg-line-number, end-line-number) pairs,
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compute changed-lines, inserted-lines, and removed-lines."
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(let* ((old-lines (cl-loop for n from before-beg-line-number to before-end-line-number
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collect n))
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(new-lines (cl-loop for n from after-beg-line-number to after-end-line-number
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collect n))
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(old-lines-len (length old-lines))
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(new-lines-len (length new-lines))
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changed-lines removed-lines inserted-lines)
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(cond ((= old-lines-len new-lines-len)
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(setq changed-lines old-lines)
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`(CHANGE-ONLY ,changed-lines))
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;; Case "REMOVE"
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((> old-lines-len new-lines-len)
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(setq removed-lines (-take (- old-lines-len new-lines-len) old-lines))
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;; Make sure that we return it in reverse order
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(setq removed-lines (cl-sort removed-lines '>))
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(setq changed-lines new-lines)
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`(REMOVE ,removed-lines ,changed-lines))
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;; Case "INSERT"
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((< old-lines-len new-lines-len)
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(setq inserted-lines (-drop old-lines-len new-lines))
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;; Make sure that we return it in sorted order
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(setq inserted-lines (cl-sort inserted-lines '<))
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(setq changed-lines old-lines)
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`(INSERT ,inserted-lines ,changed-lines)))))
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(defun lean-after-changed-p (before-beg before-end before-text
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after-beg after-end after-text)
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"Return true if there is a really change"
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(or (/= before-beg after-beg)
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(/= before-end after-end)
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(not (string= before-text after-text))))
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(defun lean-after-change-handle-changes-only (changed-lines)
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(cl-loop for n in changed-lines
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do (add-to-list 'lean-changed-lines n)))
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(defun lean-after-change-handle-inserted (inserted-lines changed-lines)
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(lean-server-flush-changed-lines)
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(cl-loop for n in inserted-lines
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do (lean-server-send-cmd-async (lean-cmd-insert n (lean-grab-line n))))
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(setq lean-changed-lines changed-lines)
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(lean-server-flush-changed-lines))
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(defun lean-after-change-handle-removed (removed-lines changed-lines)
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(lean-server-flush-changed-lines)
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(cl-loop for n in removed-lines
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do (lean-server-send-cmd-async (lean-cmd-remove n)))
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(setq lean-changed-lines changed-lines)
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(lean-server-flush-changed-lines))
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(defun lean-after-change-function (beg end leng-before)
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"Function attached to after-change-functions hook"
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(let* ((before-beg lean-global-before-change-beg)
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(before-end lean-global-before-change-end)
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(before-beg-line-number lean-global-before-change-beg-line-number)
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(before-end-line-number lean-global-before-change-end-line-number)
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(after-beg-line-number (line-number-at-pos beg))
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(after-end-line-number (line-number-at-pos end))
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(before-text lean-global-before-change-text)
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(text (buffer-substring-no-properties beg end)))
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(lean-debug "after-change-function")
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(lean-debug "before-text: %s" before-text)
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(lean-debug "after-text: %s" text)
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(when (lean-after-changed-p before-beg before-end before-text
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beg end text)
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(pcase (lean-after-change-diff-lines before-beg-line-number before-end-line-number
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after-beg-line-number after-end-line-number)
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(`(CHANGE-ONLY ,changed-lines)
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(lean-after-change-handle-changes-only changed-lines))
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(`(INSERT ,inserted-lines ,changed-lines)
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(lean-after-change-handle-inserted inserted-lines changed-lines))
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(`(REMOVE ,removed-lines ,changed-lines)
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(lean-after-change-handle-removed removed-lines changed-lines))))))
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(defconst lean-changes-hooks-alist
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'((after-change-functions . lean-after-change-function)
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(before-change-functions . lean-before-change-function)))
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(defun lean-before-revert ()
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"Remove changes hooks"
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(pcase-dolist (`(,hook . ,fn) lean-changes-hooks-alist)
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(remove-hook hook fn 'local)))
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(defun lean-after-revert ()
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"Reset changes variables, add back changes-hooks, load file"
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(setq lean-changed-lines nil)
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(setq lean-removed-lines nil)
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(setq lean-inserted-lines nil)
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(pcase-dolist (`(,hook . ,fn) lean-changes-hooks-alist)
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(add-hook hook fn nil 'local))
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(lean-server-send-cmd-async (lean-cmd-load (buffer-file-name))))
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(provide 'lean-changes)
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