new plugin to render inline latex on hover

InlineLatexHover.py

@@ -0,0 +1,43 @@
+import sublime
+import sublime_plugin
+
+import urllib.parse
+import requests
+from base64 import b64encode
+
+class InlineLatexHover(sublime_plugin.EventListener):
+    @classmethod
+    def is_applicable(cls, settings):
+        return settings.get('syntax').contains("Fortran")
+
+    def on_hover(self, view, point, hover_zone):
+        if hover_zone == sublime.HOVER_TEXT:
+            scope = view.scope_name(point)
+            score = sublime.score_selector(scope, "meta.inline_latex.fortran")
+            if score > 0:
+                # We are hovering over some embedded latex
+                region = InlineLatexHover.extract_inline_latex_scope(view, point)
+                latex = view.substr(region)
+                # todo: get colors from theme popupCss
+                bg, fg = 'ffffff', '222222'
+                params = urllib.parse.urlencode({'cht': "tx", 'chl': latex, 'chf': 'bg,s,'+bg, 'chco': fg})
+                imgurl = "http://chart.googleapis.com/chart?"+params
+                response = requests.get(imgurl)
+                imgdata = b64encode(response.content).decode()
+                html_str =  '<img src="data:image/png;base64,%s" />' % imgdata
+                view.show_popup(html_str, sublime.HIDE_ON_MOUSE_MOVE, point)
+
+    @staticmethod
+    def extract_inline_latex_scope(view, point):
+        """Like extract_scope(), but extracts the extent of meta.inline_latex.fortran."""
+        ltxscope = "meta.inline_latex.fortran"
+        istart = point
+        iend = point
+        while istart > 0 and sublime.score_selector(view.scope_name(istart-1), ltxscope) > 0:
+            istart = istart - 1
+        while iend < view.size() and sublime.score_selector(view.scope_name(iend), ltxscope) > 0:
+            iend = iend + 1
+        r = sublime.Region(istart, iend)
+        if r.size() > 1000:
+            r = sublime.Region(point, point)
+        return r

grammars/FortranModern.sublime-syntax

@@ -270,8 +270,9 @@ contexts:
     - match: (?=$)
       pop: true
   comment_inline_latex:
-    - meta_scope: meta.inline_latex.fortran
-    - meta_content_scope: markup.bold
+    # disable meta_scope to distinguish between adjacent inline latex regions
+    # - meta_scope: meta.inline_latex.fortran
+    - meta_content_scope: meta.inline_latex.fortran markup.bold
     - match: \\\w+
       scope: markup.italic
     - match: \$