Highlight Last Word Diff for Sublime Text

highlight_last_word_diff.py

import sublime
import sublime_plugin
import re

class HighlightLastWordDiffCommand(sublime_plugin.TextCommand):
    def run(self, edit):
        # Get all lines in the document
        view = self.view
        lines = view.lines(sublime.Region(0, view.size()))

        # Keep track of last word from the previous line
        last_word_prev = None

        # Clear existing regions to reset highlights
        view.erase_regions("last_word_diff_highlight")

        regions_to_highlight = []

        for i in range(1, len(lines) - 1):
            # Extract text from previous, current, and next line regions
            line_prev = view.substr(lines[i - 1]).strip()
            line_curr = view.substr(lines[i]).strip()
            line_next = view.substr(lines[i + 1]).strip()

            # Get the last words of current and previous lines
            last_word_curr = line_curr.split()[-1]
            last_word_prev = line_prev.split()[-1]

            # Compare last words
            if last_word_curr != last_word_prev:
                # Find the region of the last word in the current line
                last_word_region = self.get_last_word_region(view, lines[i], last_word_curr)
                if last_word_region:
                    regions_to_highlight.append(last_word_region)

        # Apply highlights to the view
        if regions_to_highlight:
            view.add_regions("last_word_diff_highlight", regions_to_highlight, "region.redish", "", sublime.DRAW_NO_OUTLINE)

    def get_last_word_region(self, view, line_region, last_word):
        """ Returns the region of the last word in the given line. """
        line_text = view.substr(line_region)
        last_word_match = re.search(rf'(\b{re.escape(last_word)}\b)$', line_text)
        if last_word_match:
            # Find the region of the last word within the line
            start = line_region.begin() + last_word_match.start(1)
            end = line_region.begin() + last_word_match.end(1)
            return sublime.Region(start, end)
        return None