diff -r b01e7d97e167 -r e9304c39e075 mercurial/commands.py
--- a/mercurial/commands.py	Mon Feb 12 20:01:27 2024 +0000
+++ b/mercurial/commands.py	Wed Feb 14 08:14:46 2024 +0100
@@ -371,6 +371,13 @@
             _(b'revset to not display (EXPERIMENTAL)'),
             _(b'REV'),
         ),
+        (
+            b'L',
+            b'line-range',
+            [],
+            _(b'follow line range of specified file (EXPERIMENTAL)'),
+            _(b'FILE,RANGE'),
+        ),
     ]
     + diffwsopts
     + walkopts
@@ -399,6 +406,13 @@
 
     .. container:: verbose
 
+       Use -L/--line-range FILE,M:N options to filter the output to the lines
+       from M to N in FILE. This option is incompatible with --no-follow and
+       cannot be combined with file pattern arguments. When combined with --rev
+       the line ranges refer to the state of the file at the requested revision.
+
+    .. container:: verbose
+
       Template:
 
       The following keywords are supported in addition to the common template
@@ -419,7 +433,20 @@
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
-    if not pats:
+
+    linerange = opts.get(b'line_range')
+
+    if linerange and opts.get(b'no_follow'):
+        raise error.InputError(
+            _(b'--line-range is incompatible with --no-follow')
+        )
+
+    if pats and linerange:
+        raise error.InputError(
+            _(b'cannot combine filename or pattern and --line-range')
+        )
+
+    if not pats and not linerange:
         raise error.InputError(
             _(b'at least one filename or pattern is required')
         )
@@ -450,6 +477,12 @@
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = logcmdutil.revsingle(repo, rev)
 
+    if not pats:
+        pats = [
+            fname
+            for fname, _ranges in logcmdutil._parselinerangeopt(repo, opts)
+        ]
+
     ui.pager(b'annotate')
     rootfm = ui.formatter(b'annotate', opts)
     if ui.debugflag:
@@ -554,6 +587,16 @@
         lines = fctx.annotate(
             follow=follow, skiprevs=skiprevs, diffopts=diffopts
         )
+        if linerange:
+            _fname, (line_start, line_end) = list(
+                logcmdutil._parselinerangeopt(repo, opts)
+            )[0]
+            lines = [
+                line
+                for no, line in enumerate(lines)
+                if line_start <= no < line_end
+            ]
+
         if not lines:
             fm.end()
             continue
@@ -1359,7 +1402,6 @@
             repo.dirstate.setbranch(label, repo.currenttransaction())
             ui.status(_(b'reset working directory to branch %s\n') % label)
         elif label:
-
             scmutil.checknewlabel(repo, label, b'branch')
             if revs:
                 return cmdutil.changebranch(ui, repo, revs, label, **opts)