SalesforceXyTools Support SFDX develop
From SalesforceXytools For Sublime v2.1.6(2019/06/15) Support Sfdx Deveopment.
Let us talk about using SalesforceXytools For Sublime for Salesforce SFDX Development.
start sfdx development
SFDX Command Palette
use ctrl+alt+o or SFDX->SFDX Command to open SFDX Command Palette
Create Project
force:project:create

Input your workspaceFolder


[2019-06-15 15:56:30][info] sfdx force:project:create -n "D:\Sfdx-Hello" --template standard
[2019-06-15 15:56:30][info] ********************************************************************************
target dir = D:\Sfdx-Hello
   create sfdx-project.json
   create README.md
   create .forceignore
   create .gitignore
   create config\project-scratch-def.json
   create .vscode\settings.json
   create .vscode\launch.json
   create .vscode\extensions.json
   create .prettierrc
   create .prettierignore
   create force-app\main\default\lwc\.eslintrc.json
Authorize an Org
force:auth:web:login
Select test or product.
Input your Alias.



[2019-06-15 15:58:00][info] sfdx force:auth:web:login --instanceurl https://login.salesforce.com --setalias Dev1
Test Login


[2019-06-15 15:59:36][info] sfdx force:org:open -p /home/home.jsp -u Dev1
[2019-06-15 15:59:36][info] ********************************************************************************
Access org 00DXXXXXXXX as user exiaxxxxxxxxxxxxxxxxxxx@xxxxxxxxxxx.com with the following URL: https://xxxxxxxxxxx.my.salesforce.com/secur/frontdoor.jsp?sid=xxxxxxxxxx
Set default username
force:config:set:defaultusername

[2019-06-15 15:59:58][info] sfdx force:config:set defaultusername=Dev1
[2019-06-15 15:59:58][info] ********************************************************************************
=== Set Config
NAME             VALUE
───────────────  ─────
defaultusername  Dev1
Set default username
Retrieve Source from Org
force:source:retrieve:metadata:base
"ApexClass, ApexPage, ApexComponent, ApexTrigger, LightningComponentBundle, AuraDefinitionBundle, CustomObject"

Create Apex, Trigger, Aura, LWC
create apex
[2019-06-15 16:05:59][info] sfdx force:apex:class:create -n Hello1 --outputdir "./force-app/main/default/classes" --template DefaultApexClass
[2019-06-15 16:05:59][info] ********************************************************************************
target dir = D:\Sfdx-Hello\force-app\main\default\classes
   create Hello1.cls
   create Hello1.cls-meta.xml
change your code.
public with sharing class Hello1 {
    public Hello1() {
        System.debug('hello world');
    }
}
Deploy Source from Org
[2019-06-15 16:07:48][info] sfdx force:source:deploy --loglevel fatal --sourcepath "D:\Sfdx-Hello\force-app\main\default\classes\Hello1.cls" --targetusername=Dev1
[2019-06-15 16:07:48][info] ********************************************************************************
=== Deployed Source
FULL NAME  TYPE       PROJECT PATH
─────────  ─────────  ──────────────────────────────────────────────────
Hello1     ApexClass  force-app\main\default\classes\Hello1.cls
Hello1     ApexClass  force-app\main\default\classes\Hello1.cls-meta.xml

Document
Know more sfdx command. The office document about
Salesforce CLI Command Reference
sfdx base command
List
sfdx force:alias:list
sfdx force:org:list
SFDX: Create Project with Manifest
sfdx force:project:create -n ProjectName
SFDX: Authorize an Org
sfdx force:auth:web:login --setalias MyDevOrg --setdefaultusername
SFDX: Retrieve Source from Org
sfdx force:source:retrieve --manifest ./manifest/package.xml
sfdx force:source:retrieve --metadata "ApexClass, ApexPage, ApexComponent, ApexTrigger, LightningComponentBundle, AuraDefinitionBundle, CustomObject"
SFDC: Deploy Source to Org
sfdx force:source:deploy --json --loglevel fatal --sourcepath ./force-app/main/default/classes/APEX_NAME.cls
sfdx force:source:deploy -p ./force-app/main/src