feat(inlay_hints): Add left_align for fixed column

Signed-off-by: Utkarsh Gupta <utkarshgupta137@gmail.com>

README.md

@@ -264,6 +264,13 @@ local opts = {
       -- padding from the left if max_len_align is true
       max_len_align_padding = 1,
 
+      -- whether to show hints at a fixed column or not
+      left_align = false,
+
+      -- column to show the hints at if left_align is true
+      -- useful to set this to rustfmt.max_width + 1/2
+      left_align_column = 1,
+
       -- whether to align to the extreme right or not
       right_align = false,
 

doc/rust-tools.txt

@@ -189,7 +189,14 @@ for keys that are not provided.
 
           -- padding from the left if max_len_align is true
           max_len_align_padding = 1,
-
+
+      	  -- whether to show hints at a fixed column or not
+      	  left_align = false,
+
+      	  -- column to show the hints at if left_align is true
+      	  -- useful to set this to rustfmt.max_width + 1/2
+      	  left_align_column = 1,
+
           -- whether to align to the extreme right or not
           right_align = false,
 

lua/rust-tools/config.lua

@@ -48,6 +48,13 @@ local defaults = {
       -- padding from the left if max_len_align is true
       max_len_align_padding = 1,
 
+      -- whether to show hints at a fixed column or not
+      left_align = false,
+
+      -- column to show the hints at if left_align is true
+      -- useful to set this to rustfmt.max_width + 1/2
+      left_align_column = 1,
+
       -- whether to align to the extreme right or not
       right_align = false,
 

lua/rust-tools/inlay_hints.lua

@@ -197,10 +197,13 @@ local function render_line(line, line_hints, bufnr, max_line_len)
     return
   end
 
-  if opts.max_len_align then
+  if opts.max_len_align or opts.left_align then
     local line_len =
       string.len(vim.api.nvim_buf_get_lines(bufnr, line, line + 1, true)[1])
 
+    if opts.left_align then
+      max_line_len = opts.left_align_column
+    end
     virt_text =
       string.rep(" ", max_line_len - line_len + opts.max_len_align_padding)
   end