add markdown posts

app/soapbox/features/compose/components/compose_form.js

@@ -11,6 +11,7 @@ import PollButtonContainer from '../containers/poll_button_container';
 import UploadButtonContainer from '../containers/upload_button_container';
 import { defineMessages, injectIntl } from 'react-intl';
 import SpoilerButtonContainer from '../containers/spoiler_button_container';
+import MarkdownButtonContainer from '../containers/markdown_button_container';
 import PrivacyDropdownContainer from '../containers/privacy_dropdown_container';
 import EmojiPickerDropdown from '../containers/emoji_picker_dropdown_container';
 import PollFormContainer from '../containers/poll_form_container';
@@ -48,6 +49,7 @@ class ComposeForm extends ImmutablePureComponent {
     text: PropTypes.string.isRequired,
     suggestions: ImmutablePropTypes.list,
     spoiler: PropTypes.bool,
+    markdown: PropTypes.bool,
     privacy: PropTypes.string,
     spoilerText: PropTypes.string,
     focusDate: PropTypes.instanceOf(Date),
@@ -303,6 +305,7 @@ class ComposeForm extends ImmutablePureComponent {
               <PollButtonContainer />
               <PrivacyDropdownContainer />
               <SpoilerButtonContainer />
+              <MarkdownButtonContainer />
             </div>
             {maxTootChars && <div className='character-counter__wrapper'><CharacterCounter max={maxTootChars} text={text} /></div>}
             <div className='compose-form__publish'>

app/soapbox/features/compose/containers/compose_form_container.js

@@ -16,6 +16,7 @@ const mapStateToProps = state => ({
   suggestions: state.getIn(['compose', 'suggestions']),
   spoiler: state.getIn(['compose', 'spoiler']),
   spoilerText: state.getIn(['compose', 'spoiler_text']),
+  markdown: state.getIn(['compose', 'markdown']),
   privacy: state.getIn(['compose', 'privacy']),
   focusDate: state.getIn(['compose', 'focusDate']),
   caretPosition: state.getIn(['compose', 'caretPosition']),

app/soapbox/features/compose/containers/markdown_button_container.js

@@ -0,0 +1,26 @@
+import { connect } from 'react-redux';
+import TextIconButton from '../components/text_icon_button';
+import { changeComposeMarkdown } from '../../../actions/compose';
+import { injectIntl, defineMessages } from 'react-intl';
+
+const messages = defineMessages({
+  marked: { id: 'compose_form.markdown.marked', defaultMessage: 'Post markdown enabled' },
+  unmarked: { id: 'compose_form.markdown.unmarked', defaultMessage: 'Post markdown disabled' },
+});
+
+const mapStateToProps = (state, { intl }) => ({
+  label: 'MD',
+  title: intl.formatMessage(state.getIn(['compose', 'markdown']) ? messages.marked : messages.unmarked),
+  active: state.getIn(['compose', 'markdown']),
+  ariaControls: 'markdown-input',
+});
+
+const mapDispatchToProps = dispatch => ({
+
+  onClick() {
+    dispatch(changeComposeMarkdown());
+  },
+
+});
+
+export default injectIntl(connect(mapStateToProps, mapDispatchToProps)(TextIconButton));