Mercurial > obsidian-remember-file-state

annotate src/main.ts @ 22:f7e0926c2500

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Don't restore state on a file that's already open in another pane.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 18 Mar 2022 19:25:48 -0700
parents 815b93d13e0f
children ba74a7d3709c
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1 import {
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2 App,
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3 Editor,
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4 MarkdownView,
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5 OpenViewState,
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6 Plugin,
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7 TAbstractFile,
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8 TFile,
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9 View,
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10 WorkspaceLeaf
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11 } from 'obsidian';
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12
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13 import {
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14 EditorView
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15 } from '@codemirror/view';
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16
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17 import {
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18 EditorState,
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19 EditorSelection
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20 } from '@codemirror/state';
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21
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22 import {
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23 around
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24 } from 'monkey-around';
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25
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26 import {
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27 DEFAULT_SETTINGS,
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28 RememberFileStatePluginSettings,
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29 RememberFileStatePluginSettingTab
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30 } from './settings';
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31
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32 declare var app: App;
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33
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34 // Interface for CM6 editor view
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35 interface EditorWithCM6 extends Editor {
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36 cm: EditorView
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37 };
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38
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39 // View with unique ID
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40 interface ViewWithID extends View {
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41 __uniqueId: number
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42 };
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43
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44 // Scroll info interface
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45 interface ScrollInfo {
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46 top: number, left: number
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47 };
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48
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49 interface StateData {
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50 selection: EditorSelection,
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51 scrollInfo: ScrollInfo
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52 };
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53
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54 // Interface for a file state.
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55 interface RememberedFileState {
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56 path: string;
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57 lastSavedTime: number;
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58 stateData: StateData;
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59 }
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60
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61 // Interface for all currently remembered file states.
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62 interface RememberFileStatePluginData {
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63 rememberedFiles: Record<string, RememberedFileState>;
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64 }
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65
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66 // Default empty list of remembered file states.
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67 const DEFAULT_DATA: RememberFileStatePluginData = {
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68 rememberedFiles: {}
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69 };
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70
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71 export default class RememberFileStatePlugin extends Plugin {
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72 settings: RememberFileStatePluginSettings;
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73 data: RememberFileStatePluginData;
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74
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75 // Don't restore state on the next file being opened.
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76 private _suppressNextFileOpen: boolean = false;
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77 // Next unique ID to identify views without keeping references to them.
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78 private _nextUniqueViewId: number = 0;
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79
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80 // Functions to unregister any monkey-patched view hooks on plugin unload.
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81 private _viewUninstallers: Record<string, Function> = {};
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82 // Functions to unregister any global callbacks on plugin unload.
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83 private _globalUninstallers: Function[] = [];
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84
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85 async onload() {
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86 console.log("Loading RememberFileState plugin");
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87
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88 await this.loadSettings();
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89
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90 this.data = Object.assign({}, DEFAULT_DATA);
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91
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92 this.registerEvent(this.app.workspace.on('file-open', this.onFileOpen));
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93 this.registerEvent(this.app.vault.on('rename', this.onFileRename));
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94 this.registerEvent(this.app.vault.on('delete', this.onFileDelete));
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95
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96 this.app.workspace.getLeavesOfType("markdown").forEach(
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97 (leaf: WorkspaceLeaf) => { this.registerOnUnloadFile(leaf.view as MarkdownView); });
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98
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99 const _this = this;
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100 var uninstall = around(this.app.workspace, {
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101 openLinkText: function(next) {
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102 return async function(
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103 linktext: string, sourcePath: string,
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104 newLeaf?: boolean, openViewState?: OpenViewState) {
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105 // When opening a link, we don't want to restore the
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106 // scroll position/selection/etc because there's a
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107 // good chance we want to show the file back at the
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108 // top, or we're going straight to a specific block.
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109 _this._suppressNextFileOpen = true;
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110 return await next.call(
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111 this, linktext, sourcePath, newLeaf, openViewState);
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112 };
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113 }
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114 });
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115 this._globalUninstallers.push(uninstall);
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116
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117 this.addSettingTab(new RememberFileStatePluginSettingTab(this.app, this));
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118 }
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119
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120 onunload() {
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121 // Run view uninstallers on all current views.
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122 var numViews: number = 0;
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123 this.app.workspace.getLeavesOfType("markdown").forEach(
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124 (leaf: WorkspaceLeaf) => {
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125 const filePath = (leaf.view as MarkdownView).file.path;
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126 const viewId = this.getUniqueViewId(leaf.view as ViewWithID);
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127 if (viewId != undefined) {
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128 var uninstaller = this._viewUninstallers[viewId];
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129 if (uninstaller) {
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130 console.debug(`Uninstalling hooks for view ${viewId}`, filePath);
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131 uninstaller(leaf.view);
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132 ++numViews;
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133 } else {
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134 console.debug("Found markdown view without an uninstaller!", filePath);
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135 }
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136 // Clear the ID so we don't get confused if the plugin
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137 // is re-enabled later.
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138 this.clearUniqueViewId(leaf.view as ViewWithID);
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139 } else {
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140 console.debug("Found markdown view without an ID!", filePath);
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141 }
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142 });
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143 console.debug(`Unregistered ${numViews} view callbacks`);
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144 this._viewUninstallers = {};
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145
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146 // Run global unhooks.
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147 this._globalUninstallers.forEach((cb) => cb());
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148 }
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149
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150 async loadSettings() {
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151 this.settings = Object.assign({}, DEFAULT_SETTINGS, await this.loadData());
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152 }
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153
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154 async saveSettings() {
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155 await this.saveData(this.settings);
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156 }
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157
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158 private readonly registerOnUnloadFile = function(view: MarkdownView) {
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159 var filePath = view.file.path;
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160 var viewId = this.getUniqueViewId(view as unknown as ViewWithID, true);
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161 if (viewId in this._viewUninstallers) {
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162 console.debug(`View ${viewId} is already registered`, filePath);
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163 return;
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164 }
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165
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166 console.debug(`Registering callback on view ${viewId}`, filePath);
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167 const _this = this;
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168 var uninstall = around(view, {
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169 onUnloadFile: function(next) {
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170 return async function (unloaded: TFile) {
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171 _this.rememberFileState(unloaded, this);
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172 return await next.call(this, unloaded);
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173 };
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174 }
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175 });
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176 this._viewUninstallers[viewId] = uninstall;
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177
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178 view.register(() => {
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179 // Don't hold a reference to this plugin here because this callback
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180 // will outlive it if it gets deactivated. So let's find it, and
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181 // do nothing if we don't find it.
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182 // @ts-ignore
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183 var plugin: RememberFileStatePlugin = app.plugins.getPlugin("obsidian-remember-file-state");
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184 if (plugin) {
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185 console.debug(`Unregistering view ${viewId} callback`, filePath);
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186 delete plugin._viewUninstallers[viewId];
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187 uninstall();
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188 } else {
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189 console.debug(
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190 "Plugin obsidian-remember-file-state has been unloaded, ignoring unregister");
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191 }
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192 });
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193 }
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194
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195 private readonly onFileOpen = async (
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196 openedFile: TFile
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197 ): Promise<void> => {
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198 // If `openedFile` is null, it's because the last pane was closed
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199 // and there is now an empty pane.
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200 if (openedFile) {
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201 var activeView: MarkdownView = this.app.workspace.getActiveViewOfType(MarkdownView);
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202 if (activeView) {
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203 this.registerOnUnloadFile(activeView);
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204
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205 // Don't restore the file state if:
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206 // - We are suppressing it explicitly (such as if the file was
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207 // opened via clicking a hyperlink)
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208 // - The file is already currently open in another pane
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209 if (!this._suppressNextFileOpen && !this.isFileMultiplyOpen(openedFile)) {
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210 this.restoreFileState(openedFile, activeView);
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211 }
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212 }
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213 // else: the file isn't handled by a markdown editor.
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214
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215 this._suppressNextFileOpen = false;
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216 }
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217 }
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218
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219 private readonly rememberFileState = async (file: TFile, view: MarkdownView): Promise<void> => {
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220 const scrollInfo = view.editor.getScrollInfo();
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221 const cm6editor = view.editor as EditorWithCM6;
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222 const stateSelection: EditorSelection = cm6editor.cm.state.selection;
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223 if (stateSelection == undefined) {
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224 // Legacy editor is in use, let's ignore
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225 return;
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226 }
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227 const stateSelectionJSON = stateSelection.toJSON();
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228 const stateData = {'scrollInfo': scrollInfo, 'selection': stateSelectionJSON};
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229
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230 var existingFile = this.data.rememberedFiles[file.path];
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231 if (existingFile) {
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232 existingFile.lastSavedTime = Date.now();
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233 existingFile.stateData = stateData;
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234 } else {
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235 let newFileState = {
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236 path: file.path,
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237 lastSavedTime: Date.now(),
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238 stateData: stateData
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239 };
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240 this.data.rememberedFiles[file.path] = newFileState;
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241
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242 // If we need to keep the number remembered files under a maximum,
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243 // do it now.
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244 this.forgetExcessFiles();
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245 }
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246 console.debug("Remember file state for:", file.path);
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247 }
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248
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249 private readonly restoreFileState = function(file: TFile, view: MarkdownView) {
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250 const existingFile = this.data.rememberedFiles[file.path];
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251 if (existingFile) {
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252 console.debug("Restoring file state for:", file.path);
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253 const stateData = existingFile.stateData;
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254 view.editor.scrollTo(stateData.scrollInfo.left, stateData.scrollInfo.top);
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255 const cm6editor = view.editor as EditorWithCM6;
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256 var transaction = cm6editor.cm.state.update({
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257 selection: EditorSelection.fromJSON(stateData.selection)})
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258
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259 cm6editor.cm.dispatch(transaction);
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260 }
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261 }
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262
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263 private readonly isFileMultiplyOpen = function(file: TFile) {
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264 var numFound: number = 0;
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265 this.app.workspace.getLeavesOfType("markdown").forEach(
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266 (leaf: WorkspaceLeaf) => {
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267 const filePath = (leaf.view as MarkdownView).file.path;
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268 if (filePath == file.path) {
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269 ++numFound;
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270 }
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271 });
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272 return numFound >= 2;
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273 }
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274
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275 private readonly forgetExcessFiles = function() {
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276 const keepMax = this.settings.rememberMaxFiles;
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277 if (keepMax <= 0) {
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278 return;
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279 }
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280
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281 // Sort newer files first, older files last.
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282 var filesData: RememberedFileState[] = Object.values(this.data.rememberedFiles);
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283 filesData.sort((a, b) => {
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284 if (a.lastSavedTime > b.lastSavedTime) return -1; // a before b
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285 if (a.lastSavedTime < b.lastSavedTime) return 1; // b before a
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286 return 0;
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287 });
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288
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289 // Remove older files past the limit.
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290 for (var i = keepMax; i < filesData.length; ++i) {
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291 var fileData = filesData[i];
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292 delete this.data.rememberedFiles[fileData.path];
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293 }
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294 }
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295
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296 private readonly getUniqueViewId = function(view: ViewWithID, autocreateId: boolean = false) {
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297 if (view.__uniqueId == undefined) {
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298 if (!autocreateId) {
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299 return -1;
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300 }
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301 view.__uniqueId = (this._nextUniqueViewId++);
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302 return view.__uniqueId;
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303 }
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304 return view.__uniqueId;
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305 }
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306
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307 private readonly clearUniqueViewId = function(view: ViewWithID) {
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308 delete view["__uniqueId"];
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309 }
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310
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311 private readonly onFileRename = async (
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312 file: TAbstractFile,
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313 oldPath: string,
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314 ): Promise<void> => {
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315 const existingFile: RememberedFileState = this.data.rememberedFiles[oldPath];
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316 if (existingFile) {
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317 existingFile.path = file.path;
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318 delete this.data.rememberedFiles[oldPath];
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319 this.data.rememberedFiles[file.path] = existingFile;
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320 }
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321 };
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322
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323 private readonly onFileDelete = async (
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324 file: TAbstractFile,
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325 ): Promise<void> => {
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326 delete this.data.rememberedFiles[file.path];
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327 };
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328 }
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329