Mercurial > obsidian-remember-file-state

annotate src/main.ts @ 31:cfd1b1b6768a

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Added tag 1.0.6 for changeset 88c1c125e621
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 14 Jul 2022 14:47:04 -0700
parents 66cada11efb8
children 42ff65e35f4f
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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 title: string = "";
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75 message: string = "";
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76
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77 constructor(app: App, title: string, message: string) {
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78 super(app)
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79 this.title = title;
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80 this.message = message;
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81 }
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82 onOpen() {
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83 this.contentEl.createEl('h2', {text: this.title});
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84 this.contentEl.createEl('p', {text: this.message});
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85 }
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86 };
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87
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88 export default class RememberFileStatePlugin extends Plugin {
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89 settings: RememberFileStatePluginSettings;
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90 data: RememberFileStatePluginData;
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91
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92 // Don't restore state on the next file being opened.
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93 private _suppressNextFileOpen: boolean = false;
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94 // Next unique ID to identify views without keeping references to them.
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95 private _nextUniqueViewId: number = 0;
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96
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97 // Remember last open file in each view.
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98 private _lastOpenFiles: Record<string, string> = {};
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99
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100 // Functions to unregister any monkey-patched view hooks on plugin unload.
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101 private _viewUninstallers: Record<string, Function> = {};
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102 // Functions to unregister any global callbacks on plugin unload.
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103 private _globalUninstallers: Function[] = [];
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104
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105 async onload() {
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106 console.log("Loading RememberFileState plugin");
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107
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108 await this.loadSettings();
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109
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110 this.data = Object.assign({}, DEFAULT_DATA);
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111
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112 this.registerEvent(this.app.workspace.on('file-open', this.onFileOpen));
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113 this.registerEvent(this.app.vault.on('rename', this.onFileRename));
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114 this.registerEvent(this.app.vault.on('delete', this.onFileDelete));
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115
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116 this.app.workspace.getLeavesOfType("markdown").forEach(
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117 (leaf: WorkspaceLeaf) => { this.registerOnUnloadFile(leaf.view as MarkdownView); });
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118
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119 const _this = this;
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120 var uninstall = around(this.app.workspace, {
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121 openLinkText: function(next) {
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122 return async function(
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123 linktext: string, sourcePath: string,
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124 newLeaf?: boolean, openViewState?: OpenViewState) {
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125 // When opening a link, we don't want to restore the
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126 // scroll position/selection/etc because there's a
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127 // good chance we want to show the file back at the
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128 // top, or we're going straight to a specific block.
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129 _this._suppressNextFileOpen = true;
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130 return await next.call(
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131 this, linktext, sourcePath, newLeaf, openViewState);
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132 };
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133 }
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134 });
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135 this._globalUninstallers.push(uninstall);
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136
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137 this.addSettingTab(new RememberFileStatePluginSettingTab(this.app, this));
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138
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139 if ((this.app.vault as any).getConfig('legacyEditor') !== false) {
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140 new WarningModal(
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141 this.app,
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142 "Legacy Editor Not Supported",
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143 "The 'Remember File State' plugin works only with the new editor. Please turn off 'Legacy Editor' in the options."
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144 ).open();
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145 }
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146 }
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147
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148 onunload() {
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149 // Run view uninstallers on all current views.
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150 var numViews: number = 0;
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151 this.app.workspace.getLeavesOfType("markdown").forEach(
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152 (leaf: WorkspaceLeaf) => {
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153 const filePath = (leaf.view as MarkdownView).file.path;
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154 const viewId = this.getUniqueViewId(leaf.view as ViewWithID);
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155 if (viewId != undefined) {
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156 var uninstaller = this._viewUninstallers[viewId];
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157 if (uninstaller) {
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158 console.debug(`Uninstalling hooks for view ${viewId}`, filePath);
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159 uninstaller(leaf.view);
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160 ++numViews;
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161 } else {
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162 console.debug("Found markdown view without an uninstaller!", filePath);
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163 }
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164 // Clear the ID so we don't get confused if the plugin
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165 // is re-enabled later.
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166 this.clearUniqueViewId(leaf.view as ViewWithID);
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167 } else {
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168 console.debug("Found markdown view without an ID!", filePath);
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169 }
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170 });
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171 console.debug(`Unregistered ${numViews} view callbacks`);
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172 this._viewUninstallers = {};
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173 this._lastOpenFiles = {};
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174
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175 // Run global unhooks.
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176 this._globalUninstallers.forEach((cb) => cb());
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177 }
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178
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179 async loadSettings() {
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180 this.settings = Object.assign({}, DEFAULT_SETTINGS, await this.loadData());
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181 }
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182
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183 async saveSettings() {
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184 await this.saveData(this.settings);
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185 }
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186
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187 private readonly registerOnUnloadFile = function(view: MarkdownView) {
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188 var filePath = view.file.path;
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189 var viewId = this.getUniqueViewId(view as unknown as ViewWithID, true);
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190 if (viewId in this._viewUninstallers) {
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191 return;
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192 }
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193
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194 console.debug(`Registering callback on view ${viewId}`, filePath);
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195 const _this = this;
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196 var uninstall = around(view, {
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197 onUnloadFile: function(next) {
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198 return async function (unloaded: TFile) {
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199 _this.rememberFileState(unloaded, this);
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200 return await next.call(this, unloaded);
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201 };
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202 }
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203 });
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204 this._viewUninstallers[viewId] = uninstall;
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205
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206 view.register(() => {
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207 // Don't hold a reference to this plugin here because this callback
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208 // will outlive it if it gets deactivated. So let's find it, and
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209 // do nothing if we don't find it.
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210 // @ts-ignore
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211 var plugin: RememberFileStatePlugin = app.plugins.getPlugin("obsidian-remember-file-state");
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212 if (plugin) {
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213 console.debug(`Unregistering view ${viewId} callback`, filePath);
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214 delete plugin._viewUninstallers[viewId];
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215 delete plugin._lastOpenFiles[viewId];
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216 uninstall();
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217 } else {
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218 console.debug(
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219 "Plugin obsidian-remember-file-state has been unloaded, ignoring unregister");
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220 }
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221 });
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222 }
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223
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224 private readonly onFileOpen = async (
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225 openedFile: TFile
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226 ): Promise<void> => {
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227 // If `openedFile` is null, it's because the last pane was closed
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228 // and there is now an empty pane.
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229 if (openedFile) {
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230 var activeView: MarkdownView = this.app.workspace.getActiveViewOfType(MarkdownView);
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231 if (activeView) {
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232 this.registerOnUnloadFile(activeView);
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233
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234 var isRealFileOpen = true;
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235 const viewId = this.getUniqueViewId(activeView as unknown as ViewWithID);
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236 if (viewId != undefined) {
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237 const lastOpenFileInView = this._lastOpenFiles[viewId];
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238 isRealFileOpen = (lastOpenFileInView != openedFile.path);
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239 this._lastOpenFiles[viewId] = openedFile.path;
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240 }
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241
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242 // Don't restore the file state if:
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243 // - We are suppressing it explicitly (such as if the file was
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244 // opened via clicking a hyperlink)
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245 // - The file is already currently open in another pane
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246 // - The file was already opened in this pane, and we're just
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247 // returning to it.
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248 if (!this._suppressNextFileOpen &&
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249 !this.isFileMultiplyOpen(openedFile) &&
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250 isRealFileOpen
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251 ) {
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252 try {
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253 this.restoreFileState(openedFile, activeView);
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254 } catch (err) {
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255 console.error("Couldn't restore file state: ", err);
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256 }
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257 }
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258 }
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259 // else: the file isn't handled by a markdown editor.
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260
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261 this._suppressNextFileOpen = false;
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262 }
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263 }
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264
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265 private readonly rememberFileState = async (file: TFile, view: MarkdownView): Promise<void> => {
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266 const scrollInfo = view.editor.getScrollInfo();
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267 const cm6editor = view.editor as EditorWithCM6;
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268 const stateSelection: EditorSelection = cm6editor.cm.state.selection;
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269 if (stateSelection == undefined) {
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270 // Legacy editor is in use, let's ignore
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271 return;
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272 }
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273 const stateSelectionJSON = stateSelection.toJSON();
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274 const stateData = {'scrollInfo': scrollInfo, 'selection': stateSelectionJSON};
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275
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276 var existingFile = this.data.rememberedFiles[file.path];
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277 if (existingFile) {
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278 existingFile.lastSavedTime = Date.now();
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279 existingFile.stateData = stateData;
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280 } else {
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281 let newFileState = {
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282 path: file.path,
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283 lastSavedTime: Date.now(),
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284 stateData: stateData
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285 };
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286 this.data.rememberedFiles[file.path] = newFileState;
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287
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288 // If we need to keep the number remembered files under a maximum,
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289 // do it now.
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290 this.forgetExcessFiles();
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291 }
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292 console.debug("Remember file state for:", file.path);
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293 }
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294
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295 private readonly restoreFileState = function(file: TFile, view: MarkdownView) {
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296 const existingFile = this.data.rememberedFiles[file.path];
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297 if (existingFile) {
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298 console.debug("Restoring file state for:", file.path);
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299 const stateData = existingFile.stateData;
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300 view.editor.scrollTo(stateData.scrollInfo.left, stateData.scrollInfo.top);
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301 const cm6editor = view.editor as EditorWithCM6;
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302 var transaction = cm6editor.cm.state.update({
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303 selection: EditorSelection.fromJSON(stateData.selection)})
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304
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305 cm6editor.cm.dispatch(transaction);
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306 }
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307 }
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308
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309 private readonly isFileMultiplyOpen = function(file: TFile) {
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310 var numFound: number = 0;
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311 this.app.workspace.getLeavesOfType("markdown").forEach(
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312 (leaf: WorkspaceLeaf) => {
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313 const filePath = (leaf.view as MarkdownView).file.path;
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314 if (filePath == file.path) {
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315 ++numFound;
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316 }
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317 });
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318 return numFound >= 2;
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319 }
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320
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321 private readonly forgetExcessFiles = function() {
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322 const keepMax = this.settings.rememberMaxFiles;
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323 if (keepMax <= 0) {
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324 return;
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325 }
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326
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327 // Sort newer files first, older files last.
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328 var filesData: RememberedFileState[] = Object.values(this.data.rememberedFiles);
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329 filesData.sort((a, b) => {
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330 if (a.lastSavedTime > b.lastSavedTime) return -1; // a before b
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331 if (a.lastSavedTime < b.lastSavedTime) return 1; // b before a
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332 return 0;
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333 });
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334
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335 // Remove older files past the limit.
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336 for (var i = keepMax; i < filesData.length; ++i) {
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337 var fileData = filesData[i];
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338 delete this.data.rememberedFiles[fileData.path];
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339 }
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340 }
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341
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342 private readonly getUniqueViewId = function(view: ViewWithID, autocreateId: boolean = false) {
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343 if (view.__uniqueId == undefined) {
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344 if (!autocreateId) {
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345 return -1;
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346 }
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347 view.__uniqueId = (this._nextUniqueViewId++);
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348 return view.__uniqueId;
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349 }
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350 return view.__uniqueId;
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351 }
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352
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353 private readonly clearUniqueViewId = function(view: ViewWithID) {
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354 delete view["__uniqueId"];
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355 }
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356
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357 private readonly onFileRename = async (
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358 file: TAbstractFile,
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359 oldPath: string,
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360 ): Promise<void> => {
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361 const existingFile: RememberedFileState = this.data.rememberedFiles[oldPath];
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362 if (existingFile) {
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363 existingFile.path = file.path;
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364 delete this.data.rememberedFiles[oldPath];
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365 this.data.rememberedFiles[file.path] = existingFile;
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366 }
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367 };
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368
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369 private readonly onFileDelete = async (
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370 file: TAbstractFile,
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371 ): Promise<void> => {
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372 delete this.data.rememberedFiles[file.path];
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373 };
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374 }
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375