Enhancements for the rename panel

boot.py

@@ -42,6 +42,7 @@
 from .plugin.documents import DocumentSyncListener
 from .plugin.documents import TextChangeListener
 from .plugin.edit import LspApplyDocumentEditCommand
+from .plugin.edit import LspApplyWorkspaceEditCommand
 from .plugin.execute_command import LspExecuteCommand
 from .plugin.folding_range import LspFoldAllCommand
 from .plugin.folding_range import LspFoldCommand
@@ -68,6 +69,7 @@
 from .plugin.panels import LspUpdateLogPanelCommand
 from .plugin.panels import LspUpdatePanelCommand
 from .plugin.references import LspSymbolReferencesCommand
+from .plugin.rename import LspHideRenameButtonsCommand
 from .plugin.rename import LspSymbolRenameCommand
 from .plugin.save_command import LspSaveAllCommand
 from .plugin.save_command import LspSaveCommand

plugin/core/panels.py

@@ -38,6 +38,7 @@ class PanelName:
 class PanelManager:
     def __init__(self, window: sublime.Window) -> None:
         self._window = window
+        self.rename_panel_buttons = None  # type: Optional[sublime.PhantomSet]
 
     def destroy_output_panels(self) -> None:
         for field in filter(lambda a: not a.startswith('__'), PanelName.__dict__.keys()):
@@ -91,6 +92,8 @@ def _create_panel(self, name: str, result_file_regex: str, result_line_regex: st
         panel = self.create_output_panel(name)
         if not panel:
             return None
+        if name == PanelName.Rename:
+            self.rename_panel_buttons = sublime.PhantomSet(panel, "lsp_rename_buttons")
         settings = panel.settings()
         if result_file_regex:
             settings.set("result_file_regex", result_file_regex)

plugin/core/views.py

@@ -86,7 +86,7 @@ def __str__(self) -> str:
         return "invalid URI scheme: {}".format(self.uri)
 
 
-def get_line(window: sublime.Window, file_name: str, row: int) -> str:
+def get_line(window: sublime.Window, file_name: str, row: int, strip: bool = True) -> str:
     '''
     Get the line from the buffer if the view is open, else get line from linecache.
     row - is 0 based. If you want to get the first line, you should pass 0.
@@ -95,11 +95,12 @@ def get_line(window: sublime.Window, file_name: str, row: int) -> str:
     if view:
         # get from buffer
         point = view.text_point(row, 0)
-        return view.substr(view.line(point)).strip()
+        line = view.substr(view.line(point))
     else:
         # get from linecache
         # linecache row is not 0 based, so we increment it by 1 to get the correct line.
-        return linecache.getline(file_name, row + 1).strip()
+        line = linecache.getline(file_name, row + 1)
+    return line.strip() if strip else line
 
 
 def get_storage_path() -> str:

plugin/edit.py

@@ -1,5 +1,8 @@
 from .core.edit import parse_range
+from .core.logging import debug
 from .core.protocol import TextEdit
+from .core.protocol import WorkspaceEdit
+from .core.registry import LspWindowCommand
 from .core.typing import List, Optional, Any, Generator, Iterable, Tuple
 from contextlib import contextmanager
 import operator
@@ -24,6 +27,16 @@ def temporary_setting(settings: sublime.Settings, key: str, val: Any) -> Generat
         settings.set(key, prev_val)
 
 
+class LspApplyWorkspaceEditCommand(LspWindowCommand):
+
+    def run(self, session_name: str, edit: WorkspaceEdit) -> None:
+        session = self.session_by_name(session_name)
+        if not session:
+            debug('Could not find session', session_name, 'required to apply WorkspaceEdit')
+            return
+        sublime.set_timeout_async(lambda: session.apply_workspace_edit_async(edit))
+
+
 class LspApplyDocumentEditCommand(sublime_plugin.TextCommand):
     re_placeholder = re.compile(r'\$(0|\{0:([^}]*)\})')
 

plugin/rename.py

@@ -24,10 +24,70 @@
 import sublime_plugin
 
 
+BUTTONS_TEMPLATE = """
+<style>
+    html {{
+        background-color: transparent;
+        height: 2rem;
+        padding-top: 0.3rem;
+    }}
+    a {{
+        display: inline;
+        line-height: 1.6rem;
+        padding-left: 0.6rem;
+        padding-right: 0.6rem;
+        border-width: 1px;
+        border-style: solid;
+        border-color: #fff4;
+        border-radius: 4px;
+        color: #cccccc;
+        background-color: #3f3f3f;
+        text-decoration: none;
+    }}
+    html.light a {{
+        border-color: #000a;
+        color: white;
+        background-color: #636363;
+    }}
+    a.primary {{
+        background-color: color(var(--accent) min-contrast(white 6.0));
+    }}
+    html.light a.primary {{
+        background-color: color(var(--accent) min-contrast(white 6.0));
+    }}
+</style>
+<body id='lsp-buttons'>
+    <a href='{apply}' class='primary'>Apply</a>
+    <a href='{discard}'>Discard</a>
+</body>"""
+
+DISCARD_COMMAND_URL = sublime.command_url('chain', {
+    'commands': [
+        ['hide_panel', {}],
+        ['lsp_hide_rename_buttons', {}]
+    ]
+})
+
+
 def is_range_response(result: PrepareRenameResult) -> TypeGuard[Range]:
     return 'start' in result
 
 
+def utf16_to_code_points(s: str, col: int) -> int:
+    """Convert a position from UTF-16 code units to Unicode code points, usable for string slicing."""
+    utf16_len = 0
+    idx = 0
+    for idx, c in enumerate(s):
+        if utf16_len >= col:
+            if utf16_len > col:  # If col is in the middle of a character (emoji), don't advance to the next code point
+                idx -= 1
+            break
+        utf16_len += 1 if ord(c) < 65536 else 2
+    else:
+        idx += 1  # get_line function trims the trailing '\n'
+    return idx
+
+
 # The flow of this command is fairly complicated so it deserves some documentation.
 #
 # When "LSP: Rename" is triggered from the Command Palette, the flow can go one of two ways:
@@ -134,17 +194,17 @@ def _on_rename_result_async(self, session: Session, response: Optional[Workspace
         if not response:
             return session.window.status_message('Nothing to rename')
         changes = parse_workspace_edit(response)
-        count = len(changes.keys())
-        if count == 1:
+        file_count = len(changes.keys())
+        if file_count == 1:
             session.apply_parsed_workspace_edits(changes)
             return
         total_changes = sum(map(len, changes.values()))
-        message = "Replace {} occurrences across {} files?".format(total_changes, count)
-        choice = sublime.yes_no_cancel_dialog(message, "Replace", "Dry Run")
+        message = "Replace {} occurrences across {} files?".format(total_changes, file_count)
+        choice = sublime.yes_no_cancel_dialog(message, "Replace", "Preview", title="Rename")
         if choice == sublime.DIALOG_YES:
             session.apply_parsed_workspace_edits(changes)
         elif choice == sublime.DIALOG_NO:
-            self._render_rename_panel(changes, total_changes, count)
+            self._render_rename_panel(response, changes, total_changes, file_count, session.config.name)
 
     def _on_prepare_result(self, pos: int, response: Optional[PrepareRenameResult]) -> None:
         if response is None:
@@ -172,39 +232,95 @@ def _get_relative_path(self, file_path: str) -> str:
         base_dir = wm.get_project_path(file_path)
         return os.path.relpath(file_path, base_dir) if base_dir else file_path
 
-    def _render_rename_panel(self, changes_per_uri: WorkspaceChanges, total_changes: int, file_count: int) -> None:
+    def _render_rename_panel(
+        self,
+        workspace_edit: WorkspaceEdit,
+        changes_per_uri: WorkspaceChanges,
+        total_changes: int,
+        file_count: int,
+        session_name: str
+    ) -> None:
         wm = windows.lookup(self.view.window())
         if not wm:
             return
-        panel = wm.panel_manager and wm.panel_manager.ensure_rename_panel()
+        pm = wm.panel_manager
+        if not pm:
+            return
+        panel = pm.ensure_rename_panel()
         if not panel:
             return
         to_render = []  # type: List[str]
+        reference_document = []  # type: List[str]
+        header_lines = "{} changes across {} files.\n\n".format(total_changes, file_count)
+        to_render.append(header_lines)
+        reference_document.append(header_lines)
+        ROWCOL_PREFIX = " {:>4}:{:<4} {}"
         for uri, (changes, _) in changes_per_uri.items():
             scheme, file = parse_uri(uri)
-            if scheme == "file":
-                to_render.append('{}:'.format(self._get_relative_path(file)))
-            else:
-                to_render.append('{}:'.format(uri))
+            filename_line = '{}:'.format(self._get_relative_path(file) if scheme == 'file' else uri)
+            to_render.append(filename_line)
+            reference_document.append(filename_line)
             for edit in changes:
-                start = parse_range(edit['range']['start'])
-                if scheme == "file":
-                    line_content = get_line(wm.window, file, start[0])
+                start_row, start_col_utf16 = parse_range(edit['range']['start'])
+                line_content = get_line(wm.window, file, start_row, strip=False) if scheme == 'file' else \
+                    '<no preview available>'
+                start_col = utf16_to_code_points(line_content, start_col_utf16)
+                original_line = ROWCOL_PREFIX.format(start_row + 1, start_col + 1, line_content.strip() + "\n")
+                reference_document.append(original_line)
+                if scheme == "file" and line_content:
+                    end_row, end_col_utf16 = parse_range(edit['range']['end'])
+                    new_text_rows = edit['newText'].split('\n')
+                    new_line_content = line_content[:start_col] + new_text_rows[0]
+                    if start_row == end_row and len(new_text_rows) == 1:
+                        end_col = start_col if end_col_utf16 <= start_col_utf16 else \
+                            utf16_to_code_points(line_content, end_col_utf16)
+                        if end_col < len(line_content):
+                            new_line_content += line_content[end_col:]
+                    to_render.append(
+                        ROWCOL_PREFIX.format(start_row + 1, start_col + 1, new_line_content.strip() + "\n"))
                 else:
-                    line_content = '<no preview available>'
-                to_render.append(" {:>4}:{:<4} {}".format(start[0] + 1, start[1] + 1, line_content))
-            to_render.append("")  # this adds a spacing between filenames
+                    to_render.append(original_line)
         characters = "\n".join(to_render)
         base_dir = wm.get_project_path(self.view.file_name() or "")
         panel.settings().set("result_base_dir", base_dir)
         panel.run_command("lsp_clear_panel")
         wm.window.run_command("show_panel", {"panel": "output.rename"})
-        fmt = "{} changes across {} files.\n\n{}"
         panel.run_command('append', {
-            'characters': fmt.format(total_changes, file_count, characters),
+            'characters': characters,
             'force': True,
             'scroll_to_end': False
         })
+        panel.set_reference_document("\n".join(reference_document))
+        selection = panel.sel()
+        selection.add(sublime.Region(0, panel.size()))
+        panel.run_command('toggle_inline_diff')
+        selection.clear()
+        buttons = pm.rename_panel_buttons
+        if not buttons:
+            return
+        buttons_position = sublime.Region(len(to_render[0]) - 1)
+        BUTTONS_HTML = BUTTONS_TEMPLATE.format(
+            apply=sublime.command_url('chain', {
+                'commands': [
+                    [
+                        'lsp_apply_workspace_edit',
+                        {'session_name': session_name, 'edit': workspace_edit}
+                    ],
+                    [
+                        'hide_panel',
+                        {}
+                    ],
+                    [
+                        'lsp_hide_rename_buttons',
+                        {}
+                    ]
+                ]
+            }),
+            discard=DISCARD_COMMAND_URL
+        )
+        buttons.update([
+            sublime.Phantom(buttons_position, BUTTONS_HTML, sublime.LAYOUT_BLOCK)
+        ])
 
 
 class RenameSymbolInputHandler(sublime_plugin.TextInputHandler):
@@ -226,3 +342,17 @@ def initial_text(self) -> str:
 
     def validate(self, name: str) -> bool:
         return len(name) > 0
+
+
+class LspHideRenameButtonsCommand(sublime_plugin.WindowCommand):
+
+    def run(self) -> None:
+        wm = windows.lookup(self.window)
+        if not wm:
+            return
+        pm = wm.panel_manager
+        if not pm:
+            return
+        buttons = pm.rename_panel_buttons
+        if buttons:
+            buttons.update([])

tests/test_rename_panel.py

@@ -0,0 +1,50 @@
+from LSP.plugin.rename import utf16_to_code_points
+import unittest
+
+
+class LspRenamePanelTests(unittest.TestCase):
+
+    def test_utf16_ascii(self):
+        s = 'abc'
+        self.assertEqual(utf16_to_code_points(s, 0), 0)
+        self.assertEqual(utf16_to_code_points(s, 1), 1)
+        self.assertEqual(utf16_to_code_points(s, 2), 2)
+        self.assertEqual(utf16_to_code_points(s, 3), 3)  # EOL after last character should count as its own code point
+        self.assertEqual(utf16_to_code_points(s, 1337), 3)  # clamp to EOL
+
+    def test_utf16_deseret_letter(self):
+        # https://microsoft.github.io/language-server-protocol/specifications/specification-current/#textDocuments
+        s = 'a𐐀b'
+        self.assertEqual(len(s), 3)
+        self.assertEqual(utf16_to_code_points(s, 0), 0)
+        self.assertEqual(utf16_to_code_points(s, 1), 1)
+        self.assertEqual(utf16_to_code_points(s, 2), 1)  # 𐐀 needs 2 UTF-16 code units, so this is still at code point 1
+        self.assertEqual(utf16_to_code_points(s, 3), 2)
+        self.assertEqual(utf16_to_code_points(s, 4), 3)
+        self.assertEqual(utf16_to_code_points(s, 1337), 3)
+
+    def test_utf16_emoji(self):
+        s = 'a😀x'
+        self.assertEqual(len(s), 3)
+        self.assertEqual(utf16_to_code_points(s, 0), 0)
+        self.assertEqual(utf16_to_code_points(s, 1), 1)
+        self.assertEqual(utf16_to_code_points(s, 2), 1)
+        self.assertEqual(utf16_to_code_points(s, 3), 2)
+        self.assertEqual(utf16_to_code_points(s, 4), 3)
+        self.assertEqual(utf16_to_code_points(s, 1337), 3)
+
+    def test_utf16_emoji_zwj_sequence(self):
+        # https://unicode.org/emoji/charts/emoji-zwj-sequences.html
+        s = 'a😵‍💫x'
+        self.assertEqual(len(s), 5)
+        self.assertEqual(s, 'a\U0001f635\u200d\U0001f4abx')
+        # 😵‍💫 consists of 5 UTF-16 code units and Python treats it as 3 characters
+        self.assertEqual(utf16_to_code_points(s, 0), 0)  # a
+        self.assertEqual(utf16_to_code_points(s, 1), 1)  # \U0001f635
+        self.assertEqual(utf16_to_code_points(s, 2), 1)  # \U0001f635
+        self.assertEqual(utf16_to_code_points(s, 3), 2)  # \u200d (zero width joiner)
+        self.assertEqual(utf16_to_code_points(s, 4), 3)  # \U0001f4ab
+        self.assertEqual(utf16_to_code_points(s, 5), 3)  # \U0001f4ab
+        self.assertEqual(utf16_to_code_points(s, 6), 4)  # x
+        self.assertEqual(utf16_to_code_points(s, 7), 5)  # after x
+        self.assertEqual(utf16_to_code_points(s, 1337), 5)