Editorial Workflow — Sidebar Live ToC

Run Python Script ?
Source Code
#coding: utf-8
import ui
import editor

# Used to make links open in the browser panel:
class WebViewDelegate (object):
	def webview_should_start_load(self, webview, url, nav_type):
		if nav_type == 'link_clicked':
			import webbrowser
			webbrowser.open(url)
			return False
		return True
		
class SidebarView (ui.View):
	@ui.in_background

	def refresh(self):
		if not self.active:
			# Sidebar was already closed, don't refresh anymore
			return
		# Import these again because it's possible that another
		# script has run in the meantime:
		import ui, editor
		import markdown2
		import re
		text = editor.get_text()
				
		# Only refresh if the text has changed since last time:
		if text != self.current_text:

			if self.first_run:
				# In the first run, just load the template...
				html = \
					'<!DOCTYPE html><html><head><meta http-equiv="Content-Type" ' \
					'content="text/html; charset=utf-8"><style>body ' + \
					'{font-family:helvetica; font-size: 16px;} ' + \
					'a {color: #000080; text-decoration: none;}'

				heading_levels = [1, 2, 3, 4, 5, 6]
				for level in heading_levels:
					html += \
						'h%s {font-size: 16px; font-weight: normal; ' \
						'line-height: 1.0; margin-top: 0em; margin-bottom: 1em; margin-left: %sem;} ' \
						% (str(level), str(level-1))

				html += \
					'</style></head><body><div id="content">Loading...</div>' \
					'<div style="height:400px"></div></body></html>'
				self['webview1'].load_html(html)
			else:
				# ...afterwards, replace the HTML via JavaScript, so that the
				# scroll position is preserved:

				# I tried putting this in a function, and Editorial crashed later on,
				# probably because the function returned Null

				# NB This requires a workflow "Select Range" that takes characters e.g. 5:10 to
				#    indicate the required selection.
				# TODO Add a run-time check that a workflow with this name exists
				url_part_base = u'editorial://?command=Select%%20Range&input=%s'

				# Extract all the level 1-6 markdown headings
				lines = text.split(u'\n')
				summary_text = u''
				current_pos = 0

				# TODO Only match up to 6 # characters
				heading_regexp = re.compile("^(#+[ 	]*)(.*)")

				for line in lines:
					match = heading_regexp.match(line)
					if match != None:
						line_selection = str(current_pos) + ':' + str(current_pos + len(line))

						link_text = match.group(2)
						link_text = link_text.strip()

						# Escape any []() in the text from the heading
						link_text = link_text.replace('[', '\\[')
						link_text = link_text.replace(']', '\\]')

						# Create hyperlink to jump to this position in the file
						url = url_part_base % line_selection
						hypertext_link = u'[%s](%s)' % (link_text, url)

						# Add this line to the output
						summary_text += match.group(1) + hypertext_link + u'\n'

					current_pos += len(line) + 1

				# Convert our selection from the document into html
				html = markdown2.markdown(summary_text)
				html = html.replace('"', '\\"').replace('\n', '\\n')

				# Display the HTML
				js = 'document.getElementById("content").innerHTML = "%s";' % html
				self['webview1'].evaluate_javascript(js)
				self.current_text = text

		ui.delay(self.refresh, 0.5 if self.first_run else 1.5)
		self.first_run = False
	
	def did_load(self):
		self.active = True
		self.first_run = True
		self.current_text = ''
		self.refresh()
	
	def will_close(self):
		self.active = False

def main():
	import platform
	if not platform.machine().startswith('iPad'):
		import console 
		console.alert('iPad Required',
			            'Sorry, this workflow is designed for iPad only.', 'OK',
			            hide_cancel_button=True)
		return
	v = ui.load_view()
	v['webview1'].delegate = WebViewDelegate()
	v.present('sidebar')

main()
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