Fix database migrations; add cat/field/tag editing

Progress toward #4, #5, and #26

src/taskflower/templates/namespace/admin/_helpers.html

@@ -0,0 +1,97 @@
+{% macro link_button_elem(obj_type, action_type, enabled, url, btn_icon, extra_cls='') %}
+<td class="pad-even">
+	{% if enabled %}
+		<a 
+			class="icon-only-btn {{extra_cls}}"
+			aria-label="{{action_type}} {{obj_type}}"
+			href="{{url}}"
+		>{{btn_icon|safe}}</a>
+	{% else %}
+		<a
+			class="icon-only-btn disabled"
+			aria-label="Can't {{action_type}} {{obj_type}}"
+			title="You don't have permission to {{action_type}} this {{obj_type}}"
+		>{{icon('not-allowed')|safe}}</a>
+	{% endif %}
+</td>
+{% endmacro %}
+
+{% macro obj_entry(ns, obj, obj_type, edit_endpoint, delete_endpoint, tab, entries) %}
+<tr>
+	{{
+		link_button_elem(
+			obj_type,
+			'edit',
+			obj.can_edit,
+			url_for(
+				edit_endpoint,
+				id=ns.id,
+				tid=obj.id,
+				next=cur_page_with_variables(
+					request,
+					active_tab=tab
+				)
+			),
+			icon('cog')
+		)
+	}}
+	{{
+		link_button_elem(
+			obj_type,
+			'delete',
+			obj.can_edit,
+			url_for(
+				delete_endpoint,
+				id=ns.id,
+				tid=obj.id,
+				next=cur_page_with_variables(
+					request,
+					active_tab=tab
+				)
+			),
+			icon('delete'),
+			'red'
+		)
+	}}
+	{% for entry in entries %}
+	<td>{{entry}}</td>
+	{% endfor %}
+</tr>
+{% endmacro %}
+
+{% macro obj_colgroup(entries) %}
+<colgroup>
+	<col span="1" style="width: 0;"/>
+	<col span="1" style="width: 0;"/>
+	{% for entry in entries %}
+	<col span="1"/>
+	{% endfor %}
+</colgroup>
+{% endmacro %}
+
+{% macro obj_header(entries) %}
+<tr>
+	<th>Edit</th>
+	<th>Del</th>
+	{% for entry in entries %}
+	<th>{{entry}}</th>
+	{% endfor %}
+</tr>
+{% endmacro %}
+
+{% macro obj_add_row(obj_type, can_add, url, entries) %}
+<tr>
+	<td colspan="{{len(entries) + 2}}">
+		{% if can_add %}
+			<a
+				class="link-btn icon-btn"
+				href="{{url}}"
+			>{{icon('add')|safe}} Add a new {{obj_type}}</a>
+		{% else %}
+			<a
+				class="link-btn icon-btn disabled"
+			>{{icon('not-allowed')|safe}} Add a new {{obj_type}}</a>
+		{% endif %}
+	</td>
+</tr>
+{% endmacro %}