From ae734a16aad78480687f1d84aab1be1589331e5b Mon Sep 17 00:00:00 2001
From: Utkarsh Gupta <utkarshgupta137@gmail.com>
Date: Sat, 4 Mar 2023 11:23:27 +0530
Subject: [PATCH] feat(inlay_hints): Add left_align for fixed column

Signed-off-by: Utkarsh Gupta <utkarshgupta137@gmail.com>
---
 README.md                      | 7 +++++++
 doc/rust-tools.txt             | 9 ++++++++-
 lua/rust-tools/config.lua      | 7 +++++++
 lua/rust-tools/inlay_hints.lua | 5 ++++-
 4 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 72f67a8..cbe33d2 100644
--- a/README.md
+++ b/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,
 
diff --git a/doc/rust-tools.txt b/doc/rust-tools.txt
index 6242870..03b1099 100644
--- a/doc/rust-tools.txt
+++ b/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,
     
diff --git a/lua/rust-tools/config.lua b/lua/rust-tools/config.lua
index d4ce0ac..5318b0a 100644
--- a/lua/rust-tools/config.lua
+++ b/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,
 
diff --git a/lua/rust-tools/inlay_hints.lua b/lua/rust-tools/inlay_hints.lua
index 0df31a1..ff9b4e0 100644
--- a/lua/rust-tools/inlay_hints.lua
+++ b/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