src/issue.js

const {NOT_USING_TEMPLATE, ISSUE_CREATED, ISSUE_UPDATED} = require('./text');

class Issue {
    constructor(context) {
        this.context = context;
        this.issue = context.payload.issue;
        this.body = this.issue.body;
        this.issueType = null;
        this.addLabels = [];
        this.removeLabels = [];

        if (this.isUsingTemplate()) {
            this.init();
        }
        else {
            this.response = NOT_USING_TEMPLATE;
            this.addLabels.push('invalid');
        }
    }

    init() {
        if (this._contain('Steps to reproduce')) {
            this.issueType = 'bug';
        }
        else if (this._contain('What problem does this feature solve')) {
            this.issueType = 'new-feature';
        }
        else {
            this.response = NOT_USING_TEMPLATE;
            return;
        }

        this._computeResponse();
    }

    isUsingTemplate() {
        return this.body.indexOf('generated by echarts-issue-helper') > -1;
    }

    _computeResponse() {
        switch(this.context.payload.action) {
            case 'opened':
            case 'reopened':
                this.response = ISSUE_CREATED;
                break;
            case 'edited':
                this.response = ISSUE_UPDATED;
                this.removeLabels.push('waiting-for: help');
                break;
        }

        this.addLabels.push('waiting-for: help');
        this.addLabels.push('pending');
        this.addLabels.push(this.issueType);

        const isInEnglish = this._contain('This issue is in English');
        if (isInEnglish) {
            this.addLabels.push('en');
        }
    }

    _contain(txt) {
        return this.body.indexOf(txt) > -1;
    }
}

module.exports = Issue;