From ee51d90fb8e9a289b9242f701e7011b60ee162a3 Mon Sep 17 00:00:00 2001
From: kyu08 <49891479+kyu08@users.noreply.github.com>
Date: Fri, 3 Apr 2026 18:39:18 +0900
Subject: [PATCH] feat: add FudeReviewToggleWhitespace command to toggle iwhite
 diffopt

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 CLAUDE.md           |  1 +
 README.md           |  1 +
 doc/fude.txt        |  7 +++++++
 lua/fude/config.lua |  2 ++
 lua/fude/init.lua   | 20 ++++++++++++++++++++
 plugin/fude.lua     |  4 ++++
 6 files changed, 35 insertions(+)

diff --git a/CLAUDE.md b/CLAUDE.md
index 98b4427..20c42d4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -91,6 +91,7 @@ All plugin code lives under `lua/fude/`. The plugin entry point is `plugin/fude.
 | `reload_timer` | init | init |
 | `reloading` | init | init |
 | `gitsigns_reset` | init, scope | init |
+| `iwhite` | init | init |
 | `sidepanel` | ui/sidepanel | ui/sidepanel |
 
 **高リスクフィールド**（多数のモジュールから参照）:
diff --git a/README.md b/README.md
index d80632d..1784235 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,7 @@ PR code review inside Neovim. Review GitHub pull requests without leaving your e
 | `:FudeCopyPRURL` | Copy PR URL to clipboard |
 | `:FudeReviewReload` | Reload review data from GitHub |
 | `:FudeReviewToggleCommentStyle` | Toggle comment display style (virtualText/inline) |
+| `:FudeReviewToggleWhitespace` | Toggle whitespace diff ignore (iwhite) |
 | `:FudeReviewToggleGitsigns` | Toggle gitsigns between PR base and HEAD |
 | `:FudeCreatePR` | Create draft PR from template |
 
diff --git a/doc/fude.txt b/doc/fude.txt
index 14cf648..a58de95 100644
--- a/doc/fude.txt
+++ b/doc/fude.txt
@@ -341,6 +341,13 @@ Using lazy.nvim: >lua
     or viewed/reviewed state is toggled.
     Configurable via `sidepanel` options. Requires an active session.
 
+:FudeReviewToggleWhitespace            *:FudeReviewToggleWhitespace*
+    Toggle whitespace diff ignore (iwhite) on and off.
+    When enabled, whitespace-only changes are hidden from the diff view.
+    Execute again to show whitespace changes.
+    The setting is automatically restored when review mode stops.
+    Requires an active review session.
+
 :FudeReviewToggleGitsigns              *:FudeReviewToggleGitsigns*
     Toggle gitsigns base between PR base and HEAD.
     By default during review mode, gitsigns uses the PR base (or commit
diff --git a/lua/fude/config.lua b/lua/fude/config.lua
index 7d9d2b6..9273741 100644
--- a/lua/fude/config.lua
+++ b/lua/fude/config.lua
@@ -125,6 +125,7 @@ M.state = {
 	reload_timer = nil, -- vim.uv.new_timer() handle for auto-reload
 	reloading = false, -- Guard flag to prevent concurrent reloads
 	gitsigns_reset = false, -- true: HEAD表示(一時的に元のワークツリー状態)、false: PRベース表示
+	iwhite = false, -- true: diffopt に iwhite を追加して空白差分を無視
 	sidepanel = nil, -- { win, buf, scope_entries, file_entries, section_map, augroup }
 }
 
@@ -178,6 +179,7 @@ function M.reset_state()
 		reload_timer = nil,
 		reloading = false,
 		gitsigns_reset = false,
+		iwhite = false,
 		sidepanel = nil,
 	}
 end
diff --git a/lua/fude/init.lua b/lua/fude/init.lua
index 32fa565..e3f422e 100644
--- a/lua/fude/init.lua
+++ b/lua/fude/init.lua
@@ -708,6 +708,26 @@ function M.restore_gitsigns_base()
 	end
 end
 
+--- Toggle whitespace diff ignore (iwhite).
+--- When enabled, whitespace-only changes are hidden from the diff view.
+function M.toggle_iwhite()
+	local state = config.state
+	if not state.active then
+		vim.notify("fude.nvim: Not active", vim.log.levels.WARN)
+		return
+	end
+
+	if state.iwhite then
+		state.iwhite = false
+		vim.opt.diffopt:remove("iwhite")
+		vim.notify("fude.nvim: Whitespace diff ON", vim.log.levels.INFO)
+	else
+		state.iwhite = true
+		vim.opt.diffopt:append("iwhite")
+		vim.notify("fude.nvim: Whitespace diff ignored", vim.log.levels.INFO)
+	end
+end
+
 --- Toggle gitsigns base between PR base and HEAD.
 --- When toggled to HEAD, gitsigns uses HEAD as the base to show changes in the working tree.
 --- When toggled back, gitsigns uses the PR base as the base to show changes in the working tree.
diff --git a/plugin/fude.lua b/plugin/fude.lua
index e32b289..daf53dd 100644
--- a/plugin/fude.lua
+++ b/plugin/fude.lua
@@ -153,6 +153,10 @@ vim.api.nvim_create_user_command("FudeReviewToggleCommentStyle", function()
 	require("fude.ui").refresh_extmarks()
 end, { desc = "Toggle comment display style (virtualText/inline)" })
 
+vim.api.nvim_create_user_command("FudeReviewToggleWhitespace", function()
+	require("fude").toggle_iwhite()
+end, { desc = "Toggle whitespace diff (iwhite)" })
+
 vim.api.nvim_create_user_command("FudeReviewToggleGitsigns", function()
 	require("fude").toggle_gitsigns()
 end, { desc = "Toggle gitsigns between PR base and HEAD" })