Prompt for undefined template fields (epwalsh#666)

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added: Support for UI highlights on calloutblocks
 - Added: Support for custom callout block defintions
 - Added `opts.follow_img_func` option for customizing how to handle image paths.
+- Added better handling for undefined template fields, which will now be prompted for.
 
 ### Changed
 

lua/obsidian/templates.lua

@@ -75,6 +75,7 @@ M.substitute_template_variables = function(text, client, note)
     methods["path"] = tostring(note.path)
   end
 
+  -- Replace known variables.
   for key, subst in pairs(methods) do
     for m_start, m_end in util.gfind(text, "{{" .. key .. "}}", nil, true) do
       ---@type string
@@ -90,6 +91,15 @@ M.substitute_template_variables = function(text, client, note)
     end
   end
 
+  -- Find unknown variables and prompt for them.
+  for m_start, m_end in util.gfind(text, "{{[^}]+}}") do
+    local key = util.strip_whitespace(string.sub(text, m_start + 2, m_end - 2))
+    local value = util.input(string.format("Enter value for '%s' (<cr> to skip): ", key))
+    if value and string.len(value) > 0 then
+      text = string.sub(text, 1, m_start - 1) .. value .. string.sub(text, m_end + 1)
+    end
+  end
+
   return text
 end