New classes which will improve the device settings management and eve…

…nt handling. To be integrated with one of the next commits.

src/deviceSettings.ts

@@ -0,0 +1,234 @@
+import * as fs from "fs";
+import * as path from "path";
+import * as vscode from "vscode";
+
+import * as constants from "./common/constants";
+import * as util from "./common/util";
+import * as logger from "./logger/logger";
+
+/**
+ * Generic class which provides monitoring of a specific settings value.
+ * If the value is modified a flag is set and an event is emitted.
+ *
+ * Usually you want to specialize the setter for any given value type
+ * to prevent invalid or badly formatted values to enter your settings.
+ */
+class Setting<T> {
+    /** The setting's default value. */
+    public readonly default: T;
+    /** The actual value of the setting. */
+    private _value: T | undefined;
+    /** Indicates if the value was changed since the last call to this.commit(). */
+    private _modified: boolean;
+    /** Event emitter which fires when the value is changed. */
+    private _emitter: vscode.EventEmitter<T> = new vscode.EventEmitter<T>();
+
+    constructor(defaultValue?: T) {
+        this.default = defaultValue;
+        this._value = this.default;
+    }
+    /**
+     * Value-setter - sets the value.
+     * If modified, the modified flag is set and the modified event is
+     * fired.
+     */
+    public set value(value: T | undefined) {
+        if (value !== this._value) {
+            this._value = value;
+            this._modified = true;
+            this._emitter.fire(this._value);
+        }
+    }
+    /** Value-getter - returns the internal value. */
+    public get value() {
+        return this._value;
+    }
+    /**
+     * Returns true, if the internal value has been modified.
+     * To clear the modified flag call commit().
+     */
+    public get modified() {
+        return this._modified;
+    }
+    /** Returns the modified-event emitter. */
+    public get emitter() {
+        return this._emitter;
+    }
+    /**
+     * Returns the internal value to its default value.
+     * If the default value is different from the previous value,
+     * it triggers the modified event and the modified flag is set.
+     */
+    public reset() {
+        this.value = this.default;
+    }
+    /** Reset the modified flag (if you know what you're doing) */
+    public commit() {
+        this._modified = false;
+    }
+}
+
+/**
+ * String specialization of the Setting class.
+ */
+class StrSetting extends Setting<string> {
+    /**
+     * When we override setter (below) we have to override getter as well
+     * (see JS language specs).
+     */
+    public get value() {
+        return super.value;
+    }
+    /**
+     * Set string value. Anything else than a string will set the value to
+     * its default value (undefined). White spaces at the front and back are
+     * trimmed before setting the value.
+     * If the setting's value is changed during this operation, the base
+     * class' event emitter will fire and the modified flag will be set.
+     */
+    public set value(value: string) {
+        if (typeof value !== "string") {
+            value = this.default;
+        } else {
+            value = value.trim();
+        }
+        super.value = value;
+    }
+}
+
+/**
+ * This class encapsulates all device/project specific settings and
+ * provides common operations on them.
+ */
+export class DeviceSettings {
+    public port = new StrSetting();
+    public board = new StrSetting();
+    public sketch = new StrSetting();
+    public output = new StrSetting();
+    public debugger = new StrSetting();
+    public disableIntelliSenseAutoGen = new StrSetting();
+    public configuration = new StrSetting();
+    public prebuild = new StrSetting();
+    public programmer = new StrSetting();
+
+    /**
+     * @returns true if any of the settings values has its modified flag
+     * set.
+     */
+    public get modified() {
+        return this.port.modified ||
+               this.board.modified ||
+               this.sketch.modified ||
+               this.output.modified ||
+               this.debugger.modified ||
+               this.disableIntelliSenseAutoGen.modified ||
+               this.configuration.modified ||
+               this.prebuild.modified ||
+               this.programmer.modified;
+    }
+    /**
+     * Clear modified flags of all settings values.
+     */
+    public commit() {
+        this.port.commit();
+        this.board.commit();
+        this.sketch.commit();
+        this.output.commit();
+        this.debugger.commit();
+        this.disableIntelliSenseAutoGen.commit();
+        this.configuration.commit();
+        this.prebuild.commit();
+        this.programmer.commit();
+    }
+    /**
+     * Resets all settings values to their default values.
+     * @param commit If true clear the modified flags after all values are
+     * reset.
+     */
+    public reset(commit: boolean = true) {
+        this.port.reset();
+        this.board.reset();
+        this.sketch.reset();
+        this.output.reset();
+        this.debugger.reset();
+        this.disableIntelliSenseAutoGen.reset();
+        this.configuration.reset();
+        this.prebuild.reset();
+        this.programmer.reset();
+        if (commit) {
+            this.commit();
+        }
+    }
+    /**
+     * Load settings values from the given file.
+     * If a value is changed through this operation, its event emitter will
+     * fire.
+     * @param file Path to the file the settings should be loaded from.
+     * @param commit If true reset the modified flags after all values are read.
+     * @returns true if the settings are loaded successfully.
+     */
+    public load(file: string, commit: boolean = true) {
+        const settings = util.tryParseJSON(fs.readFileSync(file, "utf8"));
+        if (settings) {
+            this.port.value = settings.port;
+            this.board.value = settings.board;
+            this.sketch.value = settings.sketch;
+            this.configuration.value = settings.configuration;
+            this.output.value = settings.output;
+            this.debugger.value = settings.debugger;
+            this.disableIntelliSenseAutoGen.value = settings.disableIntelliSenseAutoGen;
+            this.prebuild.value = settings.prebuild;
+            this.programmer.value = settings.programmer;
+            if (commit) {
+                this.commit();
+            }
+            return true;
+        } else {
+            logger.notifyUserError("arduinoFileError",
+                new Error(constants.messages.ARDUINO_FILE_ERROR));
+            return false;
+        }
+    }
+    /**
+     * Writes the settings to the given file if there are modified
+     * values. The modification flags are reset (commit()) on successful write.
+     * On write failure the modification flags are left unmodified.
+     * @param file Path to file the JSON representation of the settings should
+     * written to. If either the folder or the file does not exist they are
+     * created.
+     * @returns true on succes, false on write failure.
+     */
+    public save(file: string) {
+
+        if (!this.modified) {
+            return true;
+        }
+
+        let settings: any = {};
+        if (util.fileExistsSync(file)) {
+            settings = util.tryParseJSON(fs.readFileSync(file, "utf8"));
+        }
+        if (!settings) {
+            logger.notifyUserError(
+                "arduinoFileError",
+                new Error(constants.messages.ARDUINO_FILE_ERROR));
+            return false;
+        }
+
+        settings.sketch = this.sketch.value;
+        settings.port = this.port.value;
+        settings.board = this.board.value;
+        settings.output = this.output.value;
+        settings.debugger = this.debugger.value;
+        settings.disableIntelliSenseAutoGen = this.disableIntelliSenseAutoGen.value;
+        settings.configuration = this.configuration.value;
+        settings.programmer = this.programmer.value;
+
+        util.mkdirRecursivelySync(path.dirname(file));
+        fs.writeFileSync(file, JSON.stringify(settings, undefined, 4));
+
+        this.commit();
+
+        return true;
+    }
+}