From 50e55afa99aa9feca294a5178bad9fcb42efb704 Mon Sep 17 00:00:00 2001
From: Jackson Moore <jacksonmoore@tuta.io>
Date: Fri, 4 Sep 2026 17:57:21 +0200
Subject: Index text snapshots lazily by line

---
 lua/clever_f/text_topology.lua | 42 ++++++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 20 deletions(-)

(limited to 'lua')

diff --git a/lua/clever_f/text_topology.lua b/lua/clever_f/text_topology.lua
index 56f3b9c..37365a0 100644
--- a/lua/clever_f/text_topology.lua
+++ b/lua/clever_f/text_topology.lua
@@ -324,22 +324,14 @@ function TextView.new(text, effective_encoding, options)
   )
   local encoder = selected_function(options, "encoder", "encode", default_encode)
 
-  local lines = {}
-  for line_number = 1, snapshot.line_count do
-    lines[line_number] = index_line(
-      snapshot:line(line_number),
-      encoding,
-      splitter,
-      encoder
-    )
-  end
-
   local view = setmetatable({}, text_view_metatable)
   view_records[view] = {
     snapshot = snapshot,
     requested_encoding = requested_encoding,
     encoding = encoding,
-    lines = lines,
+    splitter = splitter,
+    encoder = encoder,
+    lines = {},
   }
   return view
 end
@@ -375,7 +367,17 @@ local function line_record(view, line_number)
   then
     fail("line_number must identify a line in the TextView", 3)
   end
-  return record.lines[line_number]
+  local line = record.lines[line_number]
+  if line == nil then
+    line = index_line(
+      record.snapshot:line(line_number),
+      record.encoding,
+      record.splitter,
+      record.encoder
+    )
+    record.lines[line_number] = line
+  end
+  return line
 end
 
 local function require_character_index(line, character_index)
@@ -433,7 +435,7 @@ function TextView:text_suffix(position)
   end
   for line_number = position.line + 1, record.snapshot.line_count do
     parts[#parts + 1] = "\n"
-    parts[#parts + 1] = record.lines[line_number].text
+    parts[#parts + 1] = record.snapshot:line(line_number)
   end
   return table.concat(parts)
 end
@@ -540,7 +542,7 @@ function TextView:is_character_start(position_or_line, byte_column)
   if line_number > record.snapshot.line_count then
     return false
   end
-  return record.lines[line_number].by_start[column] ~= nil
+  return line_record(self, line_number).by_start[column] ~= nil
 end
 
 function TextView:is_valid_cursor_position(position_or_line, byte_column)
@@ -549,7 +551,7 @@ function TextView:is_valid_cursor_position(position_or_line, byte_column)
   if line_number > record.snapshot.line_count then
     return false
   end
-  local line = record.lines[line_number]
+  local line = line_record(self, line_number)
   if line.character_count == 0 then
     return column == 1
   end
@@ -740,7 +742,7 @@ function TextView:buffer_match_start_bounds()
   local last
 
   for line_number = 1, record.snapshot.line_count do
-    local line = record.lines[line_number]
+    local line = line_record(self, line_number)
     if line.character_count > 0 then
       first = self:position_for_character_index(line_number, 1)
       break
@@ -748,7 +750,7 @@ function TextView:buffer_match_start_bounds()
   end
 
   for line_number = record.snapshot.line_count, 1, -1 do
-    local line = record.lines[line_number]
+    local line = line_record(self, line_number)
     if line.character_count > 0 then
       last = self:position_for_character_index(line_number, line.character_count)
       break
@@ -810,7 +812,7 @@ end
 
 local function step_character(view, position, direction)
   local record = view_record(view)
-  local line = record.lines[position.line]
+  local line = line_record(view, position.line)
   local character_index = line.by_start[position.byte_column]
 
   if direction == domain.Direction.FORWARD then
@@ -818,7 +820,7 @@ local function step_character(view, position, direction)
       return view:position_for_character_index(position.line, character_index + 1)
     end
     for line_number = position.line + 1, record.snapshot.line_count do
-      if record.lines[line_number].character_count > 0 then
+      if line_record(view, line_number).character_count > 0 then
         return view:position_for_character_index(line_number, 1)
       end
     end
@@ -829,7 +831,7 @@ local function step_character(view, position, direction)
     return view:position_for_character_index(position.line, character_index - 1)
   end
   for line_number = position.line - 1, 1, -1 do
-    local previous_line = record.lines[line_number]
+    local previous_line = line_record(view, line_number)
     if previous_line.character_count > 0 then
       return view:position_for_character_index(
         line_number,
-- 
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