add ability to login via env

Author: boneskull

README.md

@@ -53,6 +53,10 @@ All available configurations are listed in the table below.
 | ------------ |:--------------------- | ---------- | ------------------------------ | ------------------------------------ |
 | `serverUrl`  | `CMD_CLI_SERVER_URL`  | *`string`* | `https://my.codimd-domain.dev` | The CodiMD instance URL              |
 | `cookiePath` | `CMD_CLI_COOKIE_PATH` | *`string`* | `~/.codimd/cookies.json`       | File for storing login cookie states |
+| _n/a_        | `CMD_CLI_ID`          | *`string`* | `me@codimd-domain.dev`         | CodiMD username/email                |
+| _n/a_        | `CMD_CLI_PASSWORD`    | *`string`* | `dragon`                       | CodiMD password                      |
+
+_Don't commit your login credentials!_
 
 ## Commands
 
@@ -171,6 +175,8 @@ EXAMPLE
   Login as HMD successfully!
 ```
 
+Alternatively, you may supply an email and password via the `CMD_EMAIL` and `CMD_PASSWORD` environment variables, respectively.
+
 _See code: [src/commands/login.ts](https://github.com/hackmdio/codimd-cli/blob/v1.0.3/src/commands/login.ts)_
 
 ### `codimd-cli logout`

src/commands/login.ts

@@ -25,7 +25,8 @@ Login as HMD successfully!
   async run() {
     const {flags} = this.parse(Login)
 
-    let id = flags.id
+    let id = flags.id || process.env.CMD_CLI_ID
+    let password = process.env.CMD_CLI_PASSWORD || ''
 
     if (!id) {
       if (flags.ldap) {
@@ -52,11 +53,13 @@ Login as HMD successfully!
       }
     }
 
-    const {password} = await inquirer.prompt({
+    if (!password) {
+      password = (await inquirer.prompt({
       type: 'password',
       name: 'password',
       message: 'Enter your password'
-    })
+      })).password
+    }
 
     try {
       let success = false