fix(table): indented wrapped table rendering

Author: okuuva

lua/render-markdown/render/markdown/table.lua

@@ -166,17 +166,18 @@ function Render:compute_layout()
     end
 
     local win_width = env.win.width(self.context.win)
+    local remaining_width = math.max(win_width - self:indent_width(), 1)
     local mtw = self.config.max_table_width
     local available
     if mtw < 0 then
         -- Negative: characters from right edge
-        available = win_width + mtw
+        available = remaining_width + mtw
     elseif mtw <= 1 then
         -- Fraction of window width
-        available = math.floor(win_width * mtw)
+        available = math.floor(remaining_width * mtw)
     else
-        -- Absolute character width
-        available = math.floor(mtw)
+        -- Absolute character width, capped to fit after indentation
+        available = math.min(math.floor(mtw), remaining_width)
     end
     local num_cols = #self.data.cols
     local padding = self.config.padding
@@ -267,6 +268,13 @@ function Render:compute_layout()
     return { wrap = true, col_widths = col_widths, row_heights = row_heights }
 end
 
+---@private
+---@return integer
+function Render:indent_width()
+    local first = self.data.rows[1].node
+    return math.max(str.spaces('start', first.text), first.start_col)
+end
+
 ---@private
 ---@param node render.md.Node
 ---@return render.md.table.Col[]?
@@ -537,9 +545,7 @@ function Render:border_line(above)
     end)
     local text = chars[1] .. table.concat(parts, chars[2]) .. chars[3]
     local highlight = above and self.config.head or self.config.row
-    local first = self.data.rows[1].node
-    local spaces = math.max(str.spaces('start', first.text), first.start_col)
-    return self:line():pad(spaces):text(text, highlight)
+    return self:line():pad(self:indent_width()):text(text, highlight)
 end
 
 ---@private

tests/table_spec.lua

@@ -3,6 +3,18 @@
 local util = require('tests.util')
 
 describe('table', function()
+    ---@param columns integer
+    ---@param callback function
+    local function with_columns(columns, callback)
+        local previous = vim.o.columns
+        vim.o.columns = columns
+        local ok, err = pcall(callback)
+        vim.o.columns = previous
+        if not ok then
+            error(err, 0)
+        end
+    end
+
     local lines = {
         '',
         '| Heading 1 | `Heading 2`            |',
@@ -302,6 +314,37 @@ describe('table', function()
         })
     end)
 
+    it('wrapped indented table', function()
+        with_columns(60, function()
+            util.setup.text({
+                '',
+                '   | Approach | Allocations | Performance |',
+                '   |----------|-------------|-------------|',
+                '   | `format!()` in loop | N | Slow |',
+                '   | `write!()` to reused buffer | 1 | Fast |',
+                '   | `push_str()` + `push()` | 1 | Fastest |',
+                '   | Pre-sized `String::with_capacity()` | 1 (no realloc) | Fast |',
+            }, {
+                pipe_table = { max_table_width = -2 },
+                win_options = { wrap = { default = false, rendered = true } },
+            })
+
+            util.assert_screen({
+                '   ┌────────────────────┬────────────────┬───────────────┐',
+                '   │ Approach           │ Allocations    │ Performance   │',
+                '   ├────────────────────┼────────────────┼───────────────┤',
+                '   │ format!() in loop  │ N              │ Slow          │',
+                '   │ write!() to reused │ 1              │ Fast          │',
+                '   │  buffer            │                │               │',
+                '   │ push_str() + push( │ 1              │ Fastest       │',
+                '   │ )                  │                │               │',
+                '   │ Pre-sized String:: │ 1 (no realloc) │ Fast          │',
+                '   │ with_capacity()    │                │               │',
+                '   └────────────────────┴────────────────┴───────────────┘',
+            })
+        end)
+    end)
+
     it('wrapped long delimiter', function()
         util.setup.text({
             '',