cupcakearmy/memiens
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don't make the app crash when the config file is already present but empty.

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This commit is contained in:
cupcakearmy 2019-09-09 12:11:24 +02:00
parent 52ba538e82
commit ba0c7fa9de
1 changed files with 12 additions and 6 deletions
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18
src/index.ts
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@ -1,14 +1,17 @@
import { readFileSync, writeFileSync, lstatSync } from 'fs' import { readFileSync, writeFileSync } from 'fs'
import { resolve } from 'path' import { resolve } from 'path'
import yaml from 'yaml' import * as yaml from 'yaml'
type AllowedYamlTypes = string | number | boolean type AllowedYamlTypes = string | number | boolean
type AllowedTypes = AllowedYamlTypes | AllowedYamlTypes[] type AllowedTypes = AllowedYamlTypes | AllowedYamlTypes[]
export default class Memento { export default class Memiens {
private readonly file: string private readonly file: string
private state: any private state: any
constructor(file: string) { constructor(file: string) {
this.file = resolve(file) this.file = resolve(file)
try { try {
@ -19,7 +22,8 @@ export default class Memento {
} }
} }
public get<AllowedTypes>(setting: string, defaultValue: AllowedTypes | undefined = undefined): AllowedTypes {
public get<T extends AllowedTypes>(setting: string, defaultValue: T | undefined = undefined): T {
const props = setting.split('.') const props = setting.split('.')
let root = this.state let root = this.state
try { try {
@ -29,13 +33,13 @@ export default class Memento {
} }
if (root) return root if (root) return root
if (defaultValue) { if (defaultValue) {
// @ts-ignore
this.set(setting, defaultValue) this.set(setting, defaultValue)
return defaultValue return defaultValue
} }
throw new Error('Could not load the setting') throw new Error('Could not load the setting')
} }
public set(setting: string, value: AllowedTypes): void { public set(setting: string, value: AllowedTypes): void {
const props = setting.split('.') const props = setting.split('.')
let root = this.state let root = this.state
@ -47,10 +51,12 @@ export default class Memento {
this.save() this.save()
} }
private read() { private read() {
this.state = yaml.parse(readFileSync(this.file, 'utf-8')) this.state = yaml.parse(readFileSync(this.file, 'utf-8')) || {}
} }
private save() { private save() {
writeFileSync(this.file, yaml.stringify(this.state), 'utf-8') writeFileSync(this.file, yaml.stringify(this.state), 'utf-8')
} }