Mercurial > obsidian-remember-file-state

annotate src/main.ts @ 27:3d0ac176118f

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Show warning message if using the plugin with the legacy editor
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 14 May 2022 09:33:19 -0700
parents ba74a7d3709c
children fbaf7c7126be
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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 Modal,
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6 OpenViewState,
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7 Plugin,
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8 TAbstractFile,
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9 TFile,
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10 View,
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11 WorkspaceLeaf
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12 } from 'obsidian';
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13
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14 import {
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15 EditorView
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16 } from '@codemirror/view';
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17
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18 import {
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19 EditorState,
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20 EditorSelection
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21 } from '@codemirror/state';
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22
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23 import {
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24 around
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25 } from 'monkey-around';
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26
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27 import {
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28 DEFAULT_SETTINGS,
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29 RememberFileStatePluginSettings,
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30 RememberFileStatePluginSettingTab
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31 } from './settings';
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32
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33 declare var app: App;
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34
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35 // Interface for CM6 editor view
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36 interface EditorWithCM6 extends Editor {
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37 cm: EditorView
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38 };
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39
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40 // View with unique ID
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41 interface ViewWithID extends View {
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42 __uniqueId: number
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43 };
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44
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45 // Scroll info interface
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46 interface ScrollInfo {
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47 top: number, left: number
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48 };
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49
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50 interface StateData {
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51 selection: EditorSelection,
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52 scrollInfo: ScrollInfo
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53 };
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54
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55 // Interface for a file state.
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56 interface RememberedFileState {
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57 path: string;
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58 lastSavedTime: number;
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59 stateData: StateData;
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60 }
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61
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62 // Interface for all currently remembered file states.
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63 interface RememberFileStatePluginData {
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64 rememberedFiles: Record<string, RememberedFileState>;
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65 }
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66
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67 // Default empty list of remembered file states.
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68 const DEFAULT_DATA: RememberFileStatePluginData = {
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69 rememberedFiles: {}
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70 };
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71
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72 // Simple warning message.
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73 class WarningModal extends Modal {
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74 constructor(app: App, title: string, message: string) {
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75 super(app)
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76 this.title = title;
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77 this.message = message;
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78 }
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79 onOpen() {
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80 this.contentEl.createEl('h2', {text: this.title});
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81 this.contentEl.createEl('p', {text: this.message});
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82 }
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83 };
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84
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85 export default class RememberFileStatePlugin extends Plugin {
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86 settings: RememberFileStatePluginSettings;
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87 data: RememberFileStatePluginData;
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88
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89 // Don't restore state on the next file being opened.
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90 private _suppressNextFileOpen: boolean = false;
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91 // Next unique ID to identify views without keeping references to them.
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92 private _nextUniqueViewId: number = 0;
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93
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94 // Functions to unregister any monkey-patched view hooks on plugin unload.
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95 private _viewUninstallers: Record<string, Function> = {};
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96 // Functions to unregister any global callbacks on plugin unload.
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97 private _globalUninstallers: Function[] = [];
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98
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99 async onload() {
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100 console.log("Loading RememberFileState plugin");
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101
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102 await this.loadSettings();
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103
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104 this.data = Object.assign({}, DEFAULT_DATA);
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105
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106 this.registerEvent(this.app.workspace.on('file-open', this.onFileOpen));
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107 this.registerEvent(this.app.vault.on('rename', this.onFileRename));
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108 this.registerEvent(this.app.vault.on('delete', this.onFileDelete));
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109
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110 this.app.workspace.getLeavesOfType("markdown").forEach(
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111 (leaf: WorkspaceLeaf) => { this.registerOnUnloadFile(leaf.view as MarkdownView); });
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112
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113 const _this = this;
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114 var uninstall = around(this.app.workspace, {
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115 openLinkText: function(next) {
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116 return async function(
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117 linktext: string, sourcePath: string,
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118 newLeaf?: boolean, openViewState?: OpenViewState) {
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119 // When opening a link, we don't want to restore the
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120 // scroll position/selection/etc because there's a
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121 // good chance we want to show the file back at the
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122 // top, or we're going straight to a specific block.
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123 _this._suppressNextFileOpen = true;
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124 return await next.call(
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125 this, linktext, sourcePath, newLeaf, openViewState);
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126 };
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127 }
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128 });
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129 this._globalUninstallers.push(uninstall);
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130
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131 this.addSettingTab(new RememberFileStatePluginSettingTab(this.app, this));
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132
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133 if (this.app.vault.getConfig('legacyEditor') !== false) {
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134 new WarningModal(
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135 this.app,
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136 "Legacy Editor Not Supported",
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137 "The 'Remember File State' plugin works only with the new editor. Please turn off 'Legacy Editor' in the options."
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138 ).open();
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139 }
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140 }
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141
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142 onunload() {
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143 // Run view uninstallers on all current views.
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144 var numViews: number = 0;
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145 this.app.workspace.getLeavesOfType("markdown").forEach(
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146 (leaf: WorkspaceLeaf) => {
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147 const filePath = (leaf.view as MarkdownView).file.path;
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148 const viewId = this.getUniqueViewId(leaf.view as ViewWithID);
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149 if (viewId != undefined) {
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150 var uninstaller = this._viewUninstallers[viewId];
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151 if (uninstaller) {
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152 console.debug(`Uninstalling hooks for view ${viewId}`, filePath);
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153 uninstaller(leaf.view);
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154 ++numViews;
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155 } else {
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156 console.debug("Found markdown view without an uninstaller!", filePath);
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157 }
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158 // Clear the ID so we don't get confused if the plugin
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159 // is re-enabled later.
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160 this.clearUniqueViewId(leaf.view as ViewWithID);
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161 } else {
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162 console.debug("Found markdown view without an ID!", filePath);
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163 }
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164 });
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165 console.debug(`Unregistered ${numViews} view callbacks`);
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166 this._viewUninstallers = {};
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167
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168 // Run global unhooks.
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169 this._globalUninstallers.forEach((cb) => cb());
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170 }
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171
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172 async loadSettings() {
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173 this.settings = Object.assign({}, DEFAULT_SETTINGS, await this.loadData());
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174 }
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175
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176 async saveSettings() {
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177 await this.saveData(this.settings);
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178 }
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179
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180 private readonly registerOnUnloadFile = function(view: MarkdownView) {
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181 var filePath = view.file.path;
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182 var viewId = this.getUniqueViewId(view as unknown as ViewWithID, true);
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183 if (viewId in this._viewUninstallers) {
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184 console.debug(`View ${viewId} is already registered`, filePath);
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185 return;
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186 }
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187
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188 console.debug(`Registering callback on view ${viewId}`, filePath);
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189 const _this = this;
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190 var uninstall = around(view, {
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191 onUnloadFile: function(next) {
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192 return async function (unloaded: TFile) {
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193 _this.rememberFileState(unloaded, this);
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194 return await next.call(this, unloaded);
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195 };
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196 }
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197 });
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198 this._viewUninstallers[viewId] = uninstall;
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199
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200 view.register(() => {
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201 // Don't hold a reference to this plugin here because this callback
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202 // will outlive it if it gets deactivated. So let's find it, and
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203 // do nothing if we don't find it.
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204 // @ts-ignore
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205 var plugin: RememberFileStatePlugin = app.plugins.getPlugin("obsidian-remember-file-state");
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206 if (plugin) {
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207 console.debug(`Unregistering view ${viewId} callback`, filePath);
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208 delete plugin._viewUninstallers[viewId];
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209 uninstall();
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210 } else {
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211 console.debug(
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212 "Plugin obsidian-remember-file-state has been unloaded, ignoring unregister");
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213 }
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214 });
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215 }
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216
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217 private readonly onFileOpen = async (
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218 openedFile: TFile
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219 ): Promise<void> => {
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220 // If `openedFile` is null, it's because the last pane was closed
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221 // and there is now an empty pane.
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222 if (openedFile) {
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223 var activeView: MarkdownView = this.app.workspace.getActiveViewOfType(MarkdownView);
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224 if (activeView) {
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225 this.registerOnUnloadFile(activeView);
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226
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227 // Don't restore the file state if:
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228 // - We are suppressing it explicitly (such as if the file was
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229 // opened via clicking a hyperlink)
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230 // - The file is already currently open in another pane
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231 if (!this._suppressNextFileOpen && !this.isFileMultiplyOpen(openedFile)) {
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232 try {
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233 this.restoreFileState(openedFile, activeView);
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234 } catch (err) {
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235 console.error("Couldn't restore file state: ", err);
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236 }
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237 }
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238 }
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239 // else: the file isn't handled by a markdown editor.
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240
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241 this._suppressNextFileOpen = false;
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242 }
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243 }
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244
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245 private readonly rememberFileState = async (file: TFile, view: MarkdownView): Promise<void> => {
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246 const scrollInfo = view.editor.getScrollInfo();
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247 const cm6editor = view.editor as EditorWithCM6;
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248 const stateSelection: EditorSelection = cm6editor.cm.state.selection;
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249 if (stateSelection == undefined) {
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250 // Legacy editor is in use, let's ignore
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251 return;
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252 }
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253 const stateSelectionJSON = stateSelection.toJSON();
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254 const stateData = {'scrollInfo': scrollInfo, 'selection': stateSelectionJSON};
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255
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256 var existingFile = this.data.rememberedFiles[file.path];
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257 if (existingFile) {
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258 existingFile.lastSavedTime = Date.now();
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259 existingFile.stateData = stateData;
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260 } else {
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261 let newFileState = {
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262 path: file.path,
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263 lastSavedTime: Date.now(),
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264 stateData: stateData
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265 };
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266 this.data.rememberedFiles[file.path] = newFileState;
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267
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268 // If we need to keep the number remembered files under a maximum,
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269 // do it now.
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270 this.forgetExcessFiles();
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271 }
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272 console.debug("Remember file state for:", file.path);
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273 }
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274
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275 private readonly restoreFileState = function(file: TFile, view: MarkdownView) {
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276 const existingFile = this.data.rememberedFiles[file.path];
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277 if (existingFile) {
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278 console.debug("Restoring file state for:", file.path);
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279 const stateData = existingFile.stateData;
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280 view.editor.scrollTo(stateData.scrollInfo.left, stateData.scrollInfo.top);
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281 const cm6editor = view.editor as EditorWithCM6;
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282 var transaction = cm6editor.cm.state.update({
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283 selection: EditorSelection.fromJSON(stateData.selection)})
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284
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285 cm6editor.cm.dispatch(transaction);
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286 }
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287 }
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288
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289 private readonly isFileMultiplyOpen = function(file: TFile) {
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290 var numFound: number = 0;
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291 this.app.workspace.getLeavesOfType("markdown").forEach(
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292 (leaf: WorkspaceLeaf) => {
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293 const filePath = (leaf.view as MarkdownView).file.path;
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294 if (filePath == file.path) {
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295 ++numFound;
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296 }
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297 });
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298 return numFound >= 2;
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299 }
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300
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301 private readonly forgetExcessFiles = function() {
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302 const keepMax = this.settings.rememberMaxFiles;
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303 if (keepMax <= 0) {
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304 return;
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305 }
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306
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307 // Sort newer files first, older files last.
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308 var filesData: RememberedFileState[] = Object.values(this.data.rememberedFiles);
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309 filesData.sort((a, b) => {
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310 if (a.lastSavedTime > b.lastSavedTime) return -1; // a before b
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311 if (a.lastSavedTime < b.lastSavedTime) return 1; // b before a
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312 return 0;
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313 });
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314
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315 // Remove older files past the limit.
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316 for (var i = keepMax; i < filesData.length; ++i) {
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317 var fileData = filesData[i];
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318 delete this.data.rememberedFiles[fileData.path];
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319 }
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320 }
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321
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322 private readonly getUniqueViewId = function(view: ViewWithID, autocreateId: boolean = false) {
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323 if (view.__uniqueId == undefined) {
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324 if (!autocreateId) {
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325 return -1;
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326 }
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327 view.__uniqueId = (this._nextUniqueViewId++);
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328 return view.__uniqueId;
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329 }
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330 return view.__uniqueId;
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331 }
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332
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333 private readonly clearUniqueViewId = function(view: ViewWithID) {
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334 delete view["__uniqueId"];
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335 }
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336
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337 private readonly onFileRename = async (
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338 file: TAbstractFile,
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339 oldPath: string,
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340 ): Promise<void> => {
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341 const existingFile: RememberedFileState = this.data.rememberedFiles[oldPath];
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342 if (existingFile) {
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343 existingFile.path = file.path;
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344 delete this.data.rememberedFiles[oldPath];
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345 this.data.rememberedFiles[file.path] = existingFile;
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346 }
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347 };
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348
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349 private readonly onFileDelete = async (
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350 file: TAbstractFile,
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351 ): Promise<void> => {
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352 delete this.data.rememberedFiles[file.path];
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353 };
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354 }
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355