feat(ui): welcome screen for user dashboard (#7030)

It is shown when there's no activity in the feed.

This is a partial implementation of https://github.com/go-gitea/gitea/pull/32990.

Differences:
* drawer icon instead of package icon
* h2 instead of h3
* explore links include a link to organizations list
* explore links are hidden for hidden explore sections
* locales are in JSON, I think it's the time to start using it, the hint is simpler and doesn't lie about following users to get their updates in the feed, which isn't a feature yet
* hint uses general hint color instead of input placeholder color
    * the large icon still uses placeholder color, but I think it's ok

Things to improve later:
* use 24px variant of icon. This will require reworking `tools/generate-svg.js`
* the vue part wasn't ported, but it'd be also nice to have

Inspired-by: Kerwin Bryant <kerwin612@qq.com>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7030
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>

options/locale_next/locale_en-US.json

@@ -1,4 +1,9 @@
 {
+	"home.welcome.no_activity": "No activity",
+	"home.welcome.activity_hint": "There is nothing in your feed yet. Your actions and activity from repositories that you watch will show up here.",
+	"home.explore_repos": "Explore repositories",
+	"home.explore_users": "Explore users",
+	"home.explore_orgs": "Explore organizations",
 	"repo.pulls.merged_title_desc": {
 		"one": "merged %[1]d commit from <code>%[2]s</code> into <code>%[3]s</code> %[4]s",
 		"other": "merged %[1]d commits from <code>%[2]s</code> into <code>%[3]s</code> %[4]s"

routers/web/user/home.go

@@ -90,6 +90,8 @@ func Dashboard(ctx *context.Context) {
 	cnt, _ := organization.GetOrganizationCount(ctx, ctxUser)
 	ctx.Data["UserOrgsCount"] = cnt
 	ctx.Data["MirrorsEnabled"] = setting.Mirror.Enabled
+	ctx.Data["UsersPageIsDisabled"] = setting.Service.Explore.DisableUsersPage
+	ctx.Data["OrganizationsPageIsDisabled"] = setting.Service.Explore.DisableOrganizationsPage
 	ctx.Data["Date"] = date
 
 	var uid int64

templates/user/dashboard/dashboard.tmpl

@@ -5,7 +5,11 @@
 		<div class="flex-container-main">
 			{{template "base/alert" .}}
 			{{template "user/heatmap" .}}
-			{{template "user/dashboard/feeds" .}}
+			{{if .Feeds}}
+				{{template "user/dashboard/feeds" .}}
+			{{else}}
+				{{template "user/dashboard/guide" .}}
+			{{end}}
 		</div>
 		{{template "user/dashboard/repolist" .}}
 	</div>

templates/user/dashboard/guide.tmpl

@@ -0,0 +1,16 @@
+<div id="empty-feed" class="tw-text-center tw-p-8">
+	{{svg "octicon-inbox" 64 "tw-text-placeholder-text"}}
+	<h2>{{ctx.Locale.Tr "home.welcome.no_activity"}}</h2>
+	<p class="help">{{ctx.Locale.Tr "home.welcome.activity_hint"}}</p>
+	<div>
+		<a href="{{AppSubUrl}}/explore/repos">{{ctx.Locale.Tr "home.explore_repos"}}</a>
+		{{if not .UsersPageIsDisabled}}
+			<span>·</span>
+			<a href="{{AppSubUrl}}/explore/users">{{ctx.Locale.Tr "home.explore_users"}}</a>
+		{{end}}
+		{{if not .OrganizationsPageIsDisabled}}
+			<span>·</span>
+			<a href="{{AppSubUrl}}/explore/organizations">{{ctx.Locale.Tr "home.explore_orgs"}}</a>
+		{{end}}
+	</div>
+</div>

tests/integration/user_dashboard_test.go

@@ -1,5 +1,5 @@
 // Copyright 2024 The Forgejo Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 package integration
 
@@ -38,6 +38,25 @@ func TestUserDashboardActionLinks(t *testing.T) {
 	assert.EqualValues(t, locale.TrString("new_org.link"), strings.TrimSpace(links.Find("a[href='/org/create']").Text()))
 }
 
+func TestUserDashboardFeedWelcome(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	// User2 has some activity in feed
+	session := loginUser(t, "user2")
+	page := NewHTMLParser(t, session.MakeRequest(t, NewRequest(t, "GET", "/"), http.StatusOK).Body)
+	testUserDashboardFeedType(t, page, false)
+
+	// User1 doesn't have any activity in feed
+	session = loginUser(t, "user1")
+	page = NewHTMLParser(t, session.MakeRequest(t, NewRequest(t, "GET", "/"), http.StatusOK).Body)
+	testUserDashboardFeedType(t, page, true)
+}
+
+func testUserDashboardFeedType(t *testing.T, page *HTMLDoc, isEmpty bool) {
+	page.AssertElement(t, "#activity-feed", !isEmpty)
+	page.AssertElement(t, "#empty-feed", isEmpty)
+}
+
 func TestDashboardTitleRendering(t *testing.T) {
 	onGiteaRun(t, func(t *testing.T, u *url.URL) {
 		user4 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 4})

web_src/css/dashboard.css

@@ -79,3 +79,7 @@
 .dashboard .secondary-nav .ui.dropdown {
   max-width: 100%;
 }
+
+.dashboard .help {
+  color: var(--color-secondary-dark-8);
+}