Mercurial > obsidian-remember-file-state

annotate src/main.ts @ 45:712761e7625b 1.1.0

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Bump version to 1.1.0
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 20 Sep 2023 23:13:19 -0700
parents fae202d7b3de
children 1fe2cd2c603f
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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 Tasks,
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11 View,
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12 WorkspaceLeaf
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13 } from 'obsidian';
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14
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15 import {
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16 EditorView
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17 } from '@codemirror/view';
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18
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19 import {
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20 EditorState,
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21 EditorSelection
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22 } from '@codemirror/state';
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23
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24 import {
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25 around
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26 } from 'monkey-around';
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27
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28 import {
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29 DEFAULT_SETTINGS,
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30 RememberFileStatePluginSettings,
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31 RememberFileStatePluginSettingTab
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32 } from './settings';
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33
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34 declare var app: App;
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35
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36 // Interface for CM6 editor view
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37 interface EditorWithCM6 extends Editor {
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38 cm: EditorView
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39 };
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40
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41 // View with unique ID
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42 interface ViewWithID extends View {
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43 __uniqueId: number
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44 };
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45
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46 // Scroll info interface
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47 interface ScrollInfo {
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48 top: number, left: number
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49 };
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50
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51 interface StateData {
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52 selection: EditorSelection,
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53 scrollInfo: ScrollInfo
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54 };
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55
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56 // Interface for a file state.
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57 interface RememberedFileState {
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58 path: string;
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59 lastSavedTime: number;
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60 stateData: StateData;
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61 }
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62
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63 // Interface for all currently remembered file states.
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64 interface RememberFileStatePluginData {
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65 rememberedFiles: Record<string, RememberedFileState>;
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66 }
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67
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68 // Default empty list of remembered file states.
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69 const DEFAULT_DATA: RememberFileStatePluginData = {
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70 rememberedFiles: {}
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71 };
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72
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73 // Where to save the states database.
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74 const STATE_DB_PATH: string = '.obsidian/plugins/obsidian-remember-file-state/states.json';
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75
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76 // Simple warning message.
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77 class WarningModal extends Modal {
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78 title: string = "";
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79 message: string = "";
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80
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81 constructor(app: App, title: string, message: string) {
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82 super(app)
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83 this.title = title;
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84 this.message = message;
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85 }
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86 onOpen() {
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87 this.contentEl.createEl('h2', {text: this.title});
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88 this.contentEl.createEl('p', {text: this.message});
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89 }
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90 };
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91
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92 export default class RememberFileStatePlugin extends Plugin {
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93 settings: RememberFileStatePluginSettings;
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94 data: RememberFileStatePluginData;
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95
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96 // Don't restore state on the next file being opened.
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97 private _suppressNextFileOpen: boolean = false;
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98 // Next unique ID to identify views without keeping references to them.
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99 private _nextUniqueViewId: number = 0;
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100
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101 // Remember last open file in each view.
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102 private _lastOpenFiles: Record<string, string> = {};
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103
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104 // Functions to unregister any monkey-patched view hooks on plugin unload.
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105 private _viewUninstallers: Record<string, Function> = {};
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106 // Functions to unregister any global callbacks on plugin unload.
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107 private _globalUninstallers: Function[] = [];
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108
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109 async onload() {
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110 console.log("RememberFileState: loading plugin");
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111
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112 await this.loadSettings();
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113
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114 this.data = Object.assign({}, DEFAULT_DATA);
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115
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116 await this.readStateDatabase(STATE_DB_PATH);
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117
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118 this.registerEvent(this.app.workspace.on('file-open', this.onFileOpen));
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119 this.registerEvent(this.app.workspace.on('quit', this.onAppQuit));
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120 this.registerEvent(this.app.vault.on('rename', this.onFileRename));
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121 this.registerEvent(this.app.vault.on('delete', this.onFileDelete));
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122
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123 this.app.workspace.onLayoutReady(() => { this.onLayoutReady(); });
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124
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125 const _this = this;
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126 var uninstall = around(this.app.workspace, {
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127 openLinkText: function(next) {
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128 return async function(
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129 linktext: string, sourcePath: string,
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130 newLeaf?: boolean, openViewState?: OpenViewState) {
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131 // When opening a link, we don't want to restore the
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132 // scroll position/selection/etc because there's a
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133 // good chance we want to show the file back at the
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134 // top, or we're going straight to a specific block.
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135 _this._suppressNextFileOpen = true;
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136 return await next.call(
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137 this, linktext, sourcePath, newLeaf, openViewState);
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138 };
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139 }
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140 });
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141 this._globalUninstallers.push(uninstall);
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142
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143 this.addSettingTab(new RememberFileStatePluginSettingTab(this.app, this));
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144
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145 if ((this.app.vault as any).getConfig('legacyEditor') !== false) {
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146 new WarningModal(
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147 this.app,
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148 "Legacy Editor Not Supported",
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149 "The 'Remember File State' plugin works only with the new editor. Please turn off 'Legacy Editor' in the options."
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150 ).open();
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151 }
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152 }
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153
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154 onunload() {
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155 // Run view uninstallers on all current views.
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156 var numViews: number = 0;
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157 this.app.workspace.getLeavesOfType("markdown").forEach(
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158 (leaf: WorkspaceLeaf) => {
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159 const filePath = (leaf.view as MarkdownView).file.path;
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160 const viewId = this.getUniqueViewId(leaf.view as ViewWithID);
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161 if (viewId != undefined) {
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162 var uninstaller = this._viewUninstallers[viewId];
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163 if (uninstaller) {
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164 console.debug(`RememberFileState: uninstalling hooks for view ${viewId}`, filePath);
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165 uninstaller(leaf.view);
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166 ++numViews;
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167 } else {
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168 console.debug("RememberFileState: found markdown view without an uninstaller!", filePath);
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169 }
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170 // Clear the ID so we don't get confused if the plugin
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171 // is re-enabled later.
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172 this.clearUniqueViewId(leaf.view as ViewWithID);
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173 } else {
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174 console.debug("RememberFileState: found markdown view without an ID!", filePath);
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175 }
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176 });
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177 console.debug(`RememberFileState: unregistered ${numViews} view callbacks`);
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178 this._viewUninstallers = {};
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179 this._lastOpenFiles = {};
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180
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181 // Run global unhooks.
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182 this._globalUninstallers.forEach((cb) => cb());
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183 }
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184
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185 async loadSettings() {
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186 this.settings = Object.assign({}, DEFAULT_SETTINGS, await this.loadData());
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187 }
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188
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189 async saveSettings() {
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190 await this.saveData(this.settings);
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191 }
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192
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193 private readonly onLayoutReady = function() {
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194 this.app.workspace.getLeavesOfType("markdown").forEach(
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195 (leaf: WorkspaceLeaf) => {
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196 var view = leaf.view as MarkdownView;
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197
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198 // On startup, assign unique IDs to views and register the
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199 // unload callback to remember their state.
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200 this.registerOnUnloadFile(view);
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201
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202 // Also remember which file is opened in which view.
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203 const viewId = this.getUniqueViewId(view as unknown as ViewWithID);
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204 if (viewId != undefined) {
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205 this._lastOpenFiles[viewId] = view.file.path;
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206 }
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207
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208 // Restore state for each opened pane on startup.
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209 const existingFile = this.data.rememberedFiles[view.file.path];
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210 if (existingFile) {
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211 const savedStateData = existingFile.stateData;
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212 console.debug("RememberFileState: restoring saved state for:", view.file.path, savedStateData);
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213 this.restoreState(savedStateData, view);
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214 }
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215 });
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216 }
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217
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218 private readonly registerOnUnloadFile = function(view: MarkdownView) {
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219 var filePath = view.file.path;
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220 var viewId = this.getUniqueViewId(view as unknown as ViewWithID, true);
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221 if (viewId in this._viewUninstallers) {
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222 return;
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223 }
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224
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225 console.debug(`RememberFileState: registering callback on view ${viewId}`, filePath);
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226 const _this = this;
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227 var uninstall = around(view, {
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228 onUnloadFile: function(next) {
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229 return async function (unloaded: TFile) {
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230 _this.rememberFileState(this, unloaded);
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231 return await next.call(this, unloaded);
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232 };
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233 }
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234 });
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235 this._viewUninstallers[viewId] = uninstall;
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236
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237 view.register(() => {
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238 // Don't hold a reference to this plugin here because this callback
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239 // will outlive it if it gets deactivated. So let's find it, and
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240 // do nothing if we don't find it.
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241 // @ts-ignore
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242 var plugin: RememberFileStatePlugin = app.plugins.getPlugin("obsidian-remember-file-state");
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243 if (plugin) {
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244 console.debug(`RememberFileState: unregistering view ${viewId} callback`, filePath);
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245 delete plugin._viewUninstallers[viewId];
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246 delete plugin._lastOpenFiles[viewId];
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247 uninstall();
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248 } else {
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249 console.debug(
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250 "RememberFileState: plugin was unloaded, ignoring unregister");
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251 }
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252 });
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253 }
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254
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255 private readonly onFileOpen = async (
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256 openedFile: TFile
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257 ): Promise<void> => {
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258 // If `openedFile` is null, it's because the last pane was closed
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259 // and there is now an empty pane.
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260 if (!openedFile) {
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261 return;
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262 }
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263
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264 var shouldSuppressThis: boolean = this._suppressNextFileOpen;
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265 this._suppressNextFileOpen = false;
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266 if (shouldSuppressThis) {
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267 console.debug("RememberFileState: not restoring file state because of explicit suppression");
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268 return;
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269 }
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270
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271 // Check that the file is handled by a markdown editor, which is the
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272 // only editor we support for now.
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273 var activeView: MarkdownView = this.app.workspace.getActiveViewOfType(MarkdownView);
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274 if (!activeView) {
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275 console.debug("RememberFileState: not restoring file state, it's not a markdown view");
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276 return;
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277 }
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278
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279 this.registerOnUnloadFile(activeView);
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280
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281 // Check if this is a genuine file open, and not returning to pane that
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282 // already had this file opened in it.
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283 var isRealFileOpen = true;
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284 const viewId = this.getUniqueViewId(activeView as unknown as ViewWithID);
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285 if (viewId != undefined) {
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286 const lastOpenFileInView = this._lastOpenFiles[viewId];
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287 isRealFileOpen = (lastOpenFileInView != openedFile.path);
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288 this._lastOpenFiles[viewId] = openedFile.path;
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289 }
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290 if (!isRealFileOpen) {
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291 console.debug("RememberFileState: not restoring file state, that file was already open in this pane.");
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292 return;
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293 }
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294
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295 // Restore the state!
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296 try {
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297 const existingFile = this.data.rememberedFiles[openedFile.path];
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298 if (existingFile) {
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299 const savedStateData = existingFile.stateData;
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300 console.debug("RememberFileState: restoring saved state for:", openedFile.path, savedStateData);
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301 this.restoreState(savedStateData, activeView);
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302 } else {
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303 // If we don't have any saved state for this file, let's see if
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304 // it's opened in another pane. If so, restore that.
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305 const otherPaneState = this.findFileStateFromOtherPane(openedFile, activeView);
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306 if (otherPaneState) {
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307 console.debug("RememberFileState: restoring other pane state for:", openedFile.path, otherPaneState);
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308 this.restoreState(otherPaneState, activeView);
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309 }
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310 }
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311 } catch (err) {
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312 console.error("RememberFileState: couldn't restore file state: ", err);
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313 }
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314 }
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315
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316 private readonly rememberFileState = async (view: MarkdownView, file?: TFile): Promise<void> => {
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317 const stateData = this.getState(view);
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318
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319 if (file === undefined) {
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320 file = view.file;
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321 }
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322 var existingFile = this.data.rememberedFiles[file.path];
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323 if (existingFile) {
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324 existingFile.lastSavedTime = Date.now();
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325 existingFile.stateData = stateData;
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326 } else {
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327 let newFileState = {
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328 path: file.path,
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329 lastSavedTime: Date.now(),
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330 stateData: stateData
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331 };
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332 this.data.rememberedFiles[file.path] = newFileState;
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333
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334 // If we need to keep the number of remembered files under a maximum,
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335 // do it now.
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336 this.forgetExcessFiles();
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337 }
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338 console.debug("RememberFileState: remembered state for:", file.path, stateData);
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339 }
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340
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341 private readonly getState = function(view: MarkdownView) {
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342 // Save scrolling position (Obsidian API only gives vertical position).
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343 const scrollInfo = {top: view.currentMode.getScroll(), left: 0};
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344
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345 // Save current selection. CodeMirror returns a JSON object (not a
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346 // JSON string!) when we call toJSON.
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347 // If state selection is undefined, we have a legacy editor. Just ignore that part.
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348 const cm6editor = view.editor as EditorWithCM6;
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349 const stateSelection: EditorSelection = cm6editor.cm.state.selection;
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350 const stateSelectionJSON = (stateSelection !== undefined) ? stateSelection.toJSON() : undefined;
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351
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352 const stateData = {'scrollInfo': scrollInfo, 'selection': stateSelectionJSON};
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353
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354 return stateData;
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355 }
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356
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357 private readonly restoreState = function(stateData: StateData, view: MarkdownView) {
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358 // Restore scrolling position (Obsidian API only allows setting vertical position).
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359 view.currentMode.applyScroll(stateData.scrollInfo.top);
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360
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361 // Restore last known selection, if any.
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362 if (stateData.selection !== undefined) {
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363 const cm6editor = view.editor as EditorWithCM6;
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364 var transaction = cm6editor.cm.state.update({
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365 selection: EditorSelection.fromJSON(stateData.selection)})
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366
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367 cm6editor.cm.dispatch(transaction);
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368 }
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369 }
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370
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371 private readonly findFileStateFromOtherPane = function(file: TFile, activeView: MarkdownView) {
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372 var otherView = null;
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373 this.app.workspace.getLeavesOfType("markdown").every(
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374 (leaf: WorkspaceLeaf) => {
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375 var curView = leaf.view as MarkdownView;
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376 if (curView != activeView &&
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377 curView.file.path == file.path &&
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378 this.getUniqueViewId(curView) >= 0 // Skip views that have never been activated.
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379 ) {
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380 otherView = curView;
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381 return false; // Stop iterating leaves.
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382 }
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383 return true;
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384 },
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385 this // thisArg
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386 );
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387 return otherView ? this.getState(otherView) : null;
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388 }
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389
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390 private readonly forgetExcessFiles = function() {
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391 const keepMax = this.settings.rememberMaxFiles;
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392 if (keepMax <= 0) {
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393 return;
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394 }
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395
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396 // Sort newer files first, older files last.
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397 var filesData: RememberedFileState[] = Object.values(this.data.rememberedFiles);
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398 filesData.sort((a, b) => {
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399 if (a.lastSavedTime > b.lastSavedTime) return -1; // a before b
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400 if (a.lastSavedTime < b.lastSavedTime) return 1; // b before a
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401 return 0;
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402 });
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403
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404 // Remove older files past the limit.
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405 for (var i = keepMax; i < filesData.length; ++i) {
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406 var fileData = filesData[i];
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407 delete this.data.rememberedFiles[fileData.path];
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408 }
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409 }
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410
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diff changeset
411 private readonly getUniqueViewId = function(view: ViewWithID, autocreateId: boolean = false) {
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412 if (view.__uniqueId == undefined) {
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413 if (!autocreateId) {
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414 return -1;
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415 }
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416 view.__uniqueId = (this._nextUniqueViewId++);
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417 return view.__uniqueId;
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418 }
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419 return view.__uniqueId;
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420 }
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421
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422 private readonly clearUniqueViewId = function(view: ViewWithID) {
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423 delete view["__uniqueId"];
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424 }
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425
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426 private readonly onFileRename = async (
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427 file: TAbstractFile,
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428 oldPath: string,
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429 ): Promise<void> => {
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430 const existingFile: RememberedFileState = this.data.rememberedFiles[oldPath];
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431 if (existingFile) {
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432 existingFile.path = file.path;
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433 delete this.data.rememberedFiles[oldPath];
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434 this.data.rememberedFiles[file.path] = existingFile;
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435 }
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436 };
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437
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438 private readonly onFileDelete = async (
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439 file: TAbstractFile,
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440 ): Promise<void> => {
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441 delete this.data.rememberedFiles[file.path];
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442 };
43
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443
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444 private readonly onAppQuit = async (tasks: Tasks): Promise<void> => {
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445 const _this = this;
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446 tasks.addPromise(
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447 _this.rememberAllOpenedFileStates()
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448 .then(() => _this.writeStateDatabase(STATE_DB_PATH)));
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449 }
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450
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451 private readonly rememberAllOpenedFileStates = async(): Promise<void> => {
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452 this.app.workspace.getLeavesOfType("markdown").forEach(
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453 (leaf: WorkspaceLeaf) => {
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454 const view = leaf.view as MarkdownView;
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455 this.rememberFileState(view);
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456 }
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457 );
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458 }
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459
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460 private readonly writeStateDatabase = async(path: string): Promise<void> => {
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461 const fs = this.app.vault.adapter;
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462 const jsonDb = JSON.stringify(this.data);
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463 await fs.write(path, jsonDb);
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464 }
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465
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466 private readonly readStateDatabase = async(path: string): Promise<void> => {
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467 const fs = this.app.vault.adapter;
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468 if (await fs.exists(path)) {
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469 const jsonDb = await fs.read(path);
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470 this.data = JSON.parse(jsonDb);
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471 const numLoaded = Object.keys(this.data.rememberedFiles).length;
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472 console.debug(`RememberFileState: read ${numLoaded} record from state database.`);
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473 }
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474 }
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475 }
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476