make error messages a first class citizen in Web IDE

This is to reduce the dependancy on the flash module which just modifies
the DOM, whereas this now correcly uses the vDOM

app/assets/javascripts/ide/components/error_message.vue

+<script>
+import { mapActions } from 'vuex';
+import LoadingIcon from '../../vue_shared/components/loading_icon.vue';
+
+export default {
+  components: {
+    LoadingIcon,
+  },
+  props: {
+    message: {
+      type: Object,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      isLoading: false,
+    };
+  },
+  methods: {
+    ...mapActions(['setErrorMessage']),
+    clickAction() {
+      if (this.isLoading) return;
+
+      this.isLoading = true;
+
+      this.$store
+        .dispatch(this.message.action, this.message.actionPayload)
+        .then(() => {
+          this.isLoading = false;
+        })
+        .catch(() => {
+          this.isLoading = false;
+        });
+    },
+    clickFlash() {
+      if (!this.message.action) {
+        this.setErrorMessage(null);
+      }
+    },
+  },
+};
+</script>
+
+<template>
+  <div
+    class="flash-container flash-container-page"
+    @click="clickFlash"
+  >
+    <div class="flash-alert">
+      <span
+        v-html="message.text"
+      >
+      </span>
+      <a
+        v-if="message.action"
+        href="#"
+        class="flash-action"
+        @click.stop.prevent="clickAction"
+      >
+        {{ message.actionText }}
+        <loading-icon
+          v-show="isLoading"
+          inline
+        />
+      </a>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.flash-action {
+  color: #fff;
+}
+</style>

app/assets/javascripts/ide/components/ide.vue

@@ -7,6 +7,7 @@ import IdeStatusBar from './ide_status_bar.vue';
 import RepoEditor from './repo_editor.vue';
 import FindFile from './file_finder/index.vue';
 import RightPane from './panes/right.vue';
+import ErrorMessage from './error_message.vue';
 
 const originalStopCallback = Mousetrap.stopCallback;
 
@@ -18,6 +19,7 @@ export default {
     RepoEditor,
     FindFile,
     RightPane,
+    ErrorMessage,
   },
   computed: {
     ...mapState([
@@ -28,6 +30,7 @@ export default {
       'fileFindVisible',
       'emptyStateSvgPath',
       'currentProjectId',
+      'errorMessage',
     ]),
     ...mapGetters(['activeFile', 'hasChanges']),
   },
@@ -72,6 +75,10 @@ export default {
 
 <template>
   <article class="ide">
+    <error-message
+      v-if="errorMessage"
+      :message="errorMessage"
+    />
     <div
       class="ide-view"
     >

app/assets/javascripts/ide/stores/actions.js

@@ -175,6 +175,9 @@ export const setRightPane = ({ commit }, view) => {
 
 export const setLinks = ({ commit }, links) => commit(types.SET_LINKS, links);
 
+export const setErrorMessage = ({ commit }, errorMessage) =>
+  commit(types.SET_ERROR_MESSAGE, errorMessage);
+
 export * from './actions/tree';
 export * from './actions/file';
 export * from './actions/project';

app/assets/javascripts/ide/stores/actions/project.js

+import _ from 'underscore';
 import flash from '~/flash';
 import { __, sprintf } from '~/locale';
 import service from '../../services';
@@ -89,7 +90,7 @@ export const refreshLastCommitData = ({ commit }, { projectId, branchId } = {})
       flash(__('Error loading last commit.'), 'alert', document, null, false, true);
     });
 
-export const createNewBranchFromDefault = ({ state, getters }, branch) => {
+export const createNewBranchFromDefault = ({ state, getters }, branch) =>
   api
     .createBranch(state.currentProjectId, {
       ref: getters.currentProject.default_branch,
@@ -97,27 +98,23 @@ export const createNewBranchFromDefault = ({ state, getters }, branch) => {
     })
     .then(() => {
       location.reload();
+
+      // this forces the loading icon to spin whilst the page is reloading
+      return new Promise(() => {});
     })
     .catch(() => {});
-};
 
 export const showBranchNotFoundError = ({ dispatch }, branchId) => {
-  flash(
-    sprintf(__('Branch %{branchName} was not found in project.'), {
-      branchName: branchId,
-    }),
-    'alert',
-    document,
+  dispatch('setErrorMessage', {
+    text: sprintf(
+      __('Branch %{branchName} was not found in project.'),
       {
-      href: '#',
-      title: 'Create branch',
-      clickHandler(e) {
-        e.stopPropagation();
-        e.preventDefault();
-        dispatch('createNewBranchFromDefault', branchId);
-      },
+        branchName: `<strong>${_.escape(branchId)}</strong>`,
       },
       false,
-    true,
-  );
+    ),
+    action: 'createNewBranchFromDefault',
+    actionText: 'Create branch',
+    actionPayload: branchId,
+  });
 };

app/assets/javascripts/ide/stores/mutation_types.js

@@ -72,3 +72,5 @@ export const SET_RIGHT_PANE = 'SET_RIGHT_PANE';
 
 export const CLEAR_PROJECTS = 'CLEAR_PROJECTS';
 export const RESET_OPEN_FILES = 'RESET_OPEN_FILES';
+
+export const SET_ERROR_MESSAGE = 'SET_ERROR_MESSAGE';

app/assets/javascripts/ide/stores/mutations.js

@@ -163,6 +163,9 @@ export default {
   [types.RESET_OPEN_FILES](state) {
     Object.assign(state, { openFiles: [] });
   },
+  [types.SET_ERROR_MESSAGE](state, errorMessage) {
+    Object.assign(state, { errorMessage });
+  },
   ...projectMutations,
   ...mergeRequestMutation,
   ...fileMutations,

app/assets/javascripts/ide/stores/state.js

@@ -25,4 +25,5 @@ export default () => ({
   fileFindVisible: false,
   rightPane: null,
   links: {},
+  errorMessage: null,
 });