From e359687e3684452ff45d7a5f1a59cd40b0bfa320 Mon Sep 17 00:00:00 2001
From: okuuva <okuuva@users.noreply.github.com>
Date: Fri, 29 Sep 2023 09:12:23 +0300
Subject: feat: add darker (#80)

* feat: add darker

* fix: darker args

Added --no-color since we don't want color output. Also set --revision
and --stdin-filename since running darker for a single file doesn't make
much sense without them.

* refactor: make darker args context aware

If the buffer is modified we should set revision and stdin-filename in
order not to lose changes. If it's not we should leave them unset so
that we respect settings from pyproject.toml.
---
 lua/conform/formatters/darker.lua | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 lua/conform/formatters/darker.lua

diff --git a/lua/conform/formatters/darker.lua b/lua/conform/formatters/darker.lua
new file mode 100644
index 0000000..5f47e6b
--- /dev/null
+++ b/lua/conform/formatters/darker.lua
@@ -0,0 +1,35 @@
+local util = require("conform.util")
+---@type conform.FileFormatterConfig
+return {
+  meta = {
+    url = "https://github.com/akaihola/darker",
+    description = "Run black only on changed lines.",
+  },
+  command = "darker",
+  args = function(ctx)
+    -- make sure pre-save doesn't lose changes while post-save respects
+    -- the revision setting potentially set in pyproject.toml
+    if vim.bo[ctx.buf].modified then
+      return {
+        "--quiet",
+        "--no-color",
+        "--stdout",
+        "--revision",
+        "HEAD..:STDIN:",
+        "--stdin-filename",
+        "$FILENAME",
+      }
+    else
+      return {
+        "--quiet",
+        "--no-color",
+        "--stdout",
+        "$FILENAME",
+      }
+    end
+  end,
+  cwd = util.root_file({
+    -- https://github.com/akaihola/darker#customizing-darker-black-isort-flynt-and-linter-behavior
+    "pyproject.toml",
+  }),
+}
-- 
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