From 9fe9983bf9e00284c041c725fd37af7c2ffd16b7 Mon Sep 17 00:00:00 2001
From: Lance Edgar <lance@edbob.org>
Date: Sat, 24 Dec 2022 14:56:12 -0600
Subject: [PATCH] Add basic support for editing page help info

site admin should be able to point help wherever they want
---
 tailbone/helpers.py                           |   3 +-
 tailbone/static/themes/falafel/css/layout.css |  13 ++
 tailbone/templates/generate_feature.mako      |  17 +-
 tailbone/templates/page_help.mako             | 204 ++++++++++++++++++
 tailbone/templates/themes/falafel/base.mako   |  20 +-
 tailbone/util.py                              |  12 ++
 tailbone/views/common.py                      |   2 +
 tailbone/views/master.py                      |  72 +++++++
 8 files changed, 315 insertions(+), 28 deletions(-)
 create mode 100644 tailbone/templates/page_help.mako

diff --git a/tailbone/helpers.py b/tailbone/helpers.py
index a3d07f79..750d3f39 100644
--- a/tailbone/helpers.py
+++ b/tailbone/helpers.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2021 Lance Edgar
+#  Copyright © 2010-2022 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -40,6 +40,7 @@ from webhelpers2.html.tags import *
 
 from tailbone.util import (csrf_token, get_csrf_token,
                            pretty_datetime, raw_datetime,
+                           render_markdown,
                            route_exists)
 
 
diff --git a/tailbone/static/themes/falafel/css/layout.css b/tailbone/static/themes/falafel/css/layout.css
index b0fd0cc9..cc4d0015 100644
--- a/tailbone/static/themes/falafel/css/layout.css
+++ b/tailbone/static/themes/falafel/css/layout.css
@@ -112,6 +112,19 @@ header .level .theme-picker {
     margin-top: 1em;
 }
 
+/******************************
+ * markdown
+ ******************************/
+
+.rendered-markdown p,
+.rendered-markdown ul {
+    margin-bottom: 1rem;
+}
+
+.rendered-markdown .codehilite {
+    margin-bottom: 2rem;
+}
+
 /******************************
  * fix datepicker within modals
  * TODO: someday this may not be necessary? cf.
diff --git a/tailbone/templates/generate_feature.mako b/tailbone/templates/generate_feature.mako
index 005cc3c2..10d3d265 100644
--- a/tailbone/templates/generate_feature.mako
+++ b/tailbone/templates/generate_feature.mako
@@ -5,21 +5,6 @@
 
 <%def name="content_title()"></%def>
 
-<%def name="extra_styles()">
-  ${parent.extra_styles()}
-  <style type="text/css">
-
-    .content.result p {
-        margin-bottom: 1rem;
-    }
-
-    .content.result .codehilite {
-        margin-bottom: 2rem;
-    }
-
-  </style>
-</%def>
-
 <%def name="page_content()">
 
   <b-field horizontal label="App Prefix"
@@ -290,7 +275,7 @@
       </p>
     </header>
     <div class="card-content">
-      <div class="content result">${rendered_result or ""|n}</div>
+      <div class="content result rendered-markdown">${rendered_result or ""|n}</div>
     </div>
   </div>
 
diff --git a/tailbone/templates/page_help.mako b/tailbone/templates/page_help.mako
new file mode 100644
index 00000000..cd13011e
--- /dev/null
+++ b/tailbone/templates/page_help.mako
@@ -0,0 +1,204 @@
+## -*- coding: utf-8; -*-
+
+<%def name="render_template()">
+  <script type="text/x-template" id="page-help-template">
+    <div>
+
+      % if help_url or help_markdown:
+
+          <b-field>
+            <p class="control">
+              <b-button icon-pack="fas"
+                        icon-left="question-circle"
+                        % if help_markdown:
+                        @click="displayInit()"
+                        % elif help_url:
+                        tag="a" href="${help_url}"
+                        target="_blank"
+                        % endif
+                        >
+                Help
+              </b-button>
+            </p>
+            % if can_edit_help:
+                <p class="control">
+                  <b-button @click="configureInit()">
+                    <span><i class="fa fa-cog"></i></span>
+                  </b-button>
+                </p>
+            % endif
+          </b-field>
+
+      % elif can_edit_help:
+
+          <b-field>
+            <p class="control">
+              <b-button @click="configureInit()">
+                <span><i class="fa fa-question-circle"></i></span>
+                <span><i class="fa fa-cog"></i></span>
+              </b-button>
+            </p>
+          </b-field>
+
+      % endif
+
+      % if help_markdown:
+          <b-modal has-modal-card
+                   :active.sync="displayShowDialog">
+            <div class="modal-card">
+
+              <header class="modal-card-head">
+                <p class="modal-card-title">${index_title}</p>
+              </header>
+
+              <section class="modal-card-body">
+                ${h.render_markdown(help_markdown)}
+              </section>
+
+              <footer class="modal-card-foot">
+                % if help_url:
+                    <b-button type="is-primary"
+                              icon-pack="fas"
+                              icon-left="external-link-alt"
+                              tag="a" href="${help_url}"
+                              target="_blank">
+                      More Info
+                    </b-button>
+                % endif
+                <b-button @click="displayShowDialog = false">
+                  Close
+                </b-button>
+              </footer>
+            </div>
+          </b-modal>
+      % endif
+
+      % if can_edit_help:
+
+          <b-modal has-modal-card
+                   :active.sync="configureShowDialog">
+            <div class="modal-card">
+
+              <header class="modal-card-head">
+                <p class="modal-card-title">Configure Help</p>
+              </header>
+
+              <section class="modal-card-body">
+
+                <p class="block">
+                  This help info applies to all views with the current
+                  route prefix.
+                </p>
+
+                <b-field grouped>
+
+                  <b-field label="Route Prefix">
+                    <span>${route_prefix}</span>
+                  </b-field>
+
+                  <b-field label="URL Prefix">
+                    <span>${master.get_url_prefix()}</span>
+                  </b-field>
+
+                </b-field>
+
+                <b-field label="Help Link (URL)">
+                  <b-input v-model="helpURL"
+                           ref="helpURL">
+                  </b-input>
+                </b-field>
+
+                <b-field label="Markdown Text">
+                  <b-input v-model="markdownText"
+                           type="textarea" rows="8">
+                  </b-input>
+                </b-field>
+
+              </section>
+
+              <footer class="modal-card-foot">
+                <b-button @click="configureShowDialog = false">
+                  Cancel
+                </b-button>
+                <b-button type="is-primary"
+                          @click="configureSave()"
+                          :disabled="configureSaving"
+                          icon-pack="fas"
+                          icon-left="save">
+                  {{ configureSaving ? "Working, please wait..." : "Save" }}
+                </b-button>
+              </footer>
+            </div>
+          </b-modal>
+
+      % endif
+
+    </div>
+  </script>
+</%def>
+
+<%def name="declare_vars()">
+  <script type="text/javascript">
+
+    let PageHelp = {
+
+        template: '#page-help-template',
+        mixins: [FormPosterMixin],
+
+        methods: {
+
+            displayInit() {
+                this.displayShowDialog = true
+            },
+
+            configureInit() {
+                this.configureShowDialog = true
+                this.$nextTick(() => {
+                    this.$refs.helpURL.focus()
+                })
+            },
+
+            % if can_edit_help:
+            configureSave() {
+                this.configureSaving = true
+                let url = '${url('{}.edit_help'.format(route_prefix))}'
+                let params = {
+                    help_url: this.helpURL,
+                    markdown_text: this.markdownText,
+                }
+                this.submitForm(url, params, response => {
+                    this.configureShowDialog = false
+                    this.$buefy.toast.open({
+                        message: "Info was saved; please refresh page to see changes.",
+                        type: 'is-info',
+                        duration: 4000, // 4 seconds
+                    })
+                    this.configureSaving = false
+                }, response => {
+                    this.configureSaving = false
+                })
+            },
+            % endif
+        },
+    }
+
+    let PageHelpData = {
+        displayShowDialog: false,
+        configureShowDialog: false,
+        configureSaving: false,
+        helpURL: ${json.dumps(help_url or None)|n},
+        markdownText: ${json.dumps(help_markdown or None)|n},
+    }
+
+  </script>
+</%def>
+
+<%def name="make_component()">
+  <script type="text/javascript">
+
+    PageHelp.data = function() { return PageHelpData }
+
+    Vue.component('page-help', PageHelp)
+
+  </script>
+</%def>
diff --git a/tailbone/templates/themes/falafel/base.mako b/tailbone/templates/themes/falafel/base.mako
index fe3ef429..e46be1a5 100644
--- a/tailbone/templates/themes/falafel/base.mako
+++ b/tailbone/templates/themes/falafel/base.mako
@@ -3,6 +3,7 @@
 <%namespace file="/autocomplete.mako" import="tailbone_autocomplete_template" />
 <%namespace name="base_meta" file="/base_meta.mako" />
 <%namespace file="/formposter.mako" import="declare_formposter_mixin" />
+<%namespace name="page_help" file="/page_help.mako" />
 <!DOCTYPE html>
 <html lang="en">
   <head>
@@ -383,17 +384,9 @@
                 </div>
             % endif
 
-            ## Help Button
-            % if help_url is not Undefined and help_url:
-                <div class="level-item">
-                  <b-button tag="a" href="${help_url}"
-                            target="_blank"
-                            icon-pack="fas"
-                            icon-left="fas fa-question-circle">
-                    Help
-                  </b-button>
-                </div>
-            % endif
+            <div class="level-item">
+              <page-help></page-help>
+            </div>
 
             ## Feedback Button / Dialog
             % if request.has_perm('common.feedback'):
@@ -466,6 +459,8 @@
     </div>
   </script>
 
+  ${page_help.render_template()}
+
   <script type="text/x-template" id="feedback-template">
     <div>
 
@@ -736,6 +731,7 @@
 </%def>
 
 <%def name="declare_whole_page_vars()">
+  ${page_help.declare_vars()}
   ${h.javascript_link(request.static_url('tailbone:static/themes/falafel/js/tailbone.feedback.js') + '?ver={}'.format(tailbone.__version__))}
   <script type="text/javascript">
 
@@ -811,6 +807,8 @@
 
   ${h.javascript_link(request.static_url('tailbone:static/js/tailbone.buefy.autocomplete.js') + '?ver={}'.format(tailbone.__version__))}
 
+  ${page_help.make_component()}
+
   <script type="text/javascript">
 
     FeedbackForm.data = function() { return FeedbackFormData }
diff --git a/tailbone/util.py b/tailbone/util.py
index 5dee997f..f5457149 100644
--- a/tailbone/util.py
+++ b/tailbone/util.py
@@ -33,6 +33,8 @@ import pytz
 import humanize
 import logging
 
+import markdown
+
 from rattail.time import timezone, make_utc
 from rattail.files import resource_path
 
@@ -181,6 +183,16 @@ def raw_datetime(config, value, verbose=False, as_date=False):
     return HTML.tag('span', **kwargs)
 
 
+def render_markdown(text, **kwargs):
+    """
+    Render the given markdown text as HTML.
+    """
+    kwargs.setdefault('extensions', ['fenced_code', 'codehilite'])
+    md = markdown.markdown(text, **kwargs)
+    md = HTML.literal(md)
+    return HTML.tag('div', class_='rendered-markdown', c=[md])
+
+
 def set_app_theme(request, theme, session=None):
     """
     Set the app theme.  This modifies the *global* Mako template lookup
diff --git a/tailbone/views/common.py b/tailbone/views/common.py
index f531b48e..5e3060f1 100644
--- a/tailbone/views/common.py
+++ b/tailbone/views/common.py
@@ -287,6 +287,8 @@ class CommonView(View):
 
         # permissions
         config.add_tailbone_permission_group('common', "(common)", overwrite=False)
+        config.add_tailbone_permission('common', 'common.edit_help',
+                                       "Edit help info for *any* page")
 
         # home
         config.add_route('home', '/')
diff --git a/tailbone/views/master.py b/tailbone/views/master.py
index 313d7fd8..396c953e 100644
--- a/tailbone/views/master.py
+++ b/tailbone/views/master.py
@@ -2267,6 +2267,16 @@ class MasterView(View):
         so if you like you can return a different help URL depending on which
         type of CRUD view is in effect, etc.
         """
+        model = self.model
+        route_prefix = self.get_route_prefix()
+
+        # nb. self.Session may differ, so use tailbone.db.Session
+        info = Session.query(model.TailbonePageHelp)\
+                      .filter(model.TailbonePageHelp.route_prefix == route_prefix)\
+                      .first()
+        if info and info.help_url:
+            return info.help_url
+
         if self.help_url:
             return self.help_url
 
@@ -2275,6 +2285,54 @@ class MasterView(View):
 
         return global_help_url(self.rattail_config)
 
+    def get_help_markdown(self):
+        """
+        Return the markdown help text for current page, if defined.
+        """
+        model = self.model
+        route_prefix = self.get_route_prefix()
+
+        # nb. self.Session may differ, so use tailbone.db.Session
+        info = Session.query(model.TailbonePageHelp)\
+                      .filter(model.TailbonePageHelp.route_prefix == route_prefix)\
+                      .first()
+        if info and info.markdown_text:
+            return info.markdown_text
+
+    def edit_help(self):
+        if (not self.has_perm('edit_help')
+            and not self.request.has_perm('common.edit_help')):
+            raise self.forbidden()
+
+        model = self.model
+        route_prefix = self.get_route_prefix()
+        schema = colander.Schema()
+
+        schema.add(colander.SchemaNode(colander.String(),
+                                       name='help_url',
+                                       missing=None))
+
+        schema.add(colander.SchemaNode(colander.String(),
+                                       name='markdown_text',
+                                       missing=None))
+
+        factory = self.get_form_factory()
+        form = factory(schema=schema, request=self.request)
+        if not form.validate(newstyle=True):
+            return {'error': "Form did not validate"}
+
+        # nb. self.Session may differ, so use tailbone.db.Session
+        info = Session.query(model.TailbonePageHelp)\
+                      .filter(model.TailbonePageHelp.route_prefix == route_prefix)\
+                      .first()
+        if not info:
+            info = model.TailbonePageHelp(route_prefix=route_prefix)
+            Session.add(info)
+
+        info.help_url = form.validated['help_url']
+        info.markdown_text = form.validated['markdown_text']
+        return {'ok': True}
+
     def render_to_response(self, template, data, **kwargs):
         """
         Return a response with the given template rendered with the given data.
@@ -2296,6 +2354,9 @@ class MasterView(View):
             'action_url': self.get_action_url,
             'grid_index': self.grid_index,
             'help_url': self.get_help_url(),
+            'help_markdown': self.get_help_markdown(),
+            'can_edit_help': (self.has_perm('edit_help')
+                              or self.request.has_perm('common.edit_help')),
             'quickie': None,
         }
 
@@ -4761,6 +4822,17 @@ class MasterView(View):
                                                'prevent_cache_for_index_views',
                                                default=True)
 
+        # edit help info
+        config.add_tailbone_permission(permission_prefix,
+                                       '{}.edit_help'.format(permission_prefix),
+                                       "Edit help info for {}".format(model_title_plural))
+        config.add_route('{}.edit_help'.format(route_prefix),
+                         '{}/edit-help'.format(url_prefix),
+                         request_method='POST')
+        config.add_view(cls, attr='edit_help',
+                        route_name='{}.edit_help'.format(route_prefix),
+                        renderer='json')
+
         # list/search
         if cls.listable:
             config.add_tailbone_permission(permission_prefix, '{}.list'.format(permission_prefix),