🐛 FIX: Nested field lists incorrectly nesting inside parent containers

Field lists inside list items (or other indented containers) would
recursively nest each field inside the previous one, instead of being
siblings. The body-indent scanner compared `tShift` against 0, which
doesn't account for the parent block's indentation (`blkIndent`).

Changed the check to `state.tShift[_line] <= state.blkIndent` so the
comparison is relative to the containing block's indent.

Fixes executablebooks/MyST-Parser#1108

Author: chrisjsewell

mdit_py_plugins/field_list/__init__.py

@@ -164,8 +164,9 @@ def _fieldlist_rule(
             while _line < endLine:
                 # if start_of_content < end_of_content, then non-empty line
                 if (state.bMarks[_line] + state.tShift[_line]) < state.eMarks[_line]:
-                    if state.tShift[_line] <= 0:
-                        # the line has no indent, so it's the end of the field
+                    if state.tShift[_line] <= state.blkIndent:
+                        # the line is not indented relative to the field marker,
+                        # so it's the end of the field body
                         break
                     block_indent = (
                         state.tShift[_line]

tests/fixtures/field_list.md

@@ -388,3 +388,171 @@ indented</p>
 </dd>
 </dl>
 .
+
+Multiple fields in list item:
+.
+- :name1: body1
+  :name2: body2
+  :name3: body3
+.
+<ul>
+<li>
+<dl class="field-list">
+<dt>name1</dt>
+<dd>
+<p>body1</p>
+</dd>
+<dt>name2</dt>
+<dd>
+<p>body2</p>
+</dd>
+<dt>name3</dt>
+<dd>
+<p>body3</p>
+</dd>
+</dl>
+</li>
+</ul>
+.
+
+Multiple fields in list item with body continuation:
+.
+- :name1: body1
+      continuation
+  :name2: body2
+.
+<ul>
+<li>
+<dl class="field-list">
+<dt>name1</dt>
+<dd>
+<p>body1
+continuation</p>
+</dd>
+<dt>name2</dt>
+<dd>
+<p>body2</p>
+</dd>
+</dl>
+</li>
+</ul>
+.
+
+Multiple fields in list item with multi-paragraph body:
+.
+- :name1: body1
+
+      paragraph 2
+  :name2: body2
+.
+<ul>
+<li>
+<dl class="field-list">
+<dt>name1</dt>
+<dd>
+<p>body1</p>
+<p>paragraph 2</p>
+</dd>
+<dt>name2</dt>
+<dd>
+<p>body2</p>
+</dd>
+</dl>
+</li>
+</ul>
+.
+
+Field list in nested list:
+.
+- item
+  - :name1: body1
+    :name2: body2
+.
+<ul>
+<li>item
+<ul>
+<li>
+<dl class="field-list">
+<dt>name1</dt>
+<dd>
+<p>body1</p>
+</dd>
+<dt>name2</dt>
+<dd>
+<p>body2</p>
+</dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+.
+
+Nested field list (body on next line):
+.
+:outer:
+  :inner1: val1
+  :inner2: val2
+.
+<dl class="field-list">
+<dt>outer</dt>
+<dd>
+<dl class="field-list">
+<dt>inner1</dt>
+<dd>
+<p>val1</p>
+</dd>
+<dt>inner2</dt>
+<dd>
+<p>val2</p>
+</dd>
+</dl>
+</dd>
+</dl>
+.
+
+Nested field list (inline body):
+.
+:outer: :inner1: val1
+        :inner2: val2
+.
+<dl class="field-list">
+<dt>outer</dt>
+<dd>
+<dl class="field-list">
+<dt>inner1</dt>
+<dd>
+<p>val1</p>
+</dd>
+<dt>inner2</dt>
+<dd>
+<p>val2</p>
+</dd>
+</dl>
+</dd>
+</dl>
+.
+
+Double nested field list:
+.
+:a:
+  :b:
+    :c: val
+.
+<dl class="field-list">
+<dt>a</dt>
+<dd>
+<dl class="field-list">
+<dt>b</dt>
+<dd>
+<dl class="field-list">
+<dt>c</dt>
+<dd>
+<p>val</p>
+</dd>
+</dl>
+</dd>
+</dl>
+</dd>
+</dl>
+.