From 3bc4b74f12303319e088c963a7c13486c4e4e776 Mon Sep 17 00:00:00 2001
From: William Boman <william@redwill.se>
Date: Fri, 13 Oct 2023 15:40:24 +0200
Subject: feat(path): add relative(from, to)

---
 lua/mason-core/path.lua | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

(limited to 'lua/mason-core/path.lua')

diff --git a/lua/mason-core/path.lua b/lua/mason-core/path.lua
index 9eeed3ba..66f0f964 100644
--- a/lua/mason-core/path.lua
+++ b/lua/mason-core/path.lua
@@ -24,7 +24,38 @@ end
 ---@path root_path string
 ---@path path string
 function M.is_subdirectory(root_path, path)
-    return root_path == path or path:sub(1, #root_path + 1) == root_path .. sep
+    local root_path_normalized = vim.fs.normalize(root_path)
+    local path_normalized = vim.fs.normalize(path)
+    if path_normalized == root_path_normalized then
+        return true
+    end
+    for dir in vim.fs.parents(path_normalized) do
+        if root_path_normalized == dir then
+            return true
+        end
+    end
+    return false
+end
+
+local function find_closest_common_parent(from, to)
+    local distance = 0
+    for parent in vim.fs.parents(from) do
+        if to:find(parent, 1, true) then
+            return parent, distance
+        else
+            distance = distance + 1
+        end
+    end
+    return "/", distance
+end
+
+function M.relative(from, to)
+    local from_normalized = vim.fs.normalize(from)
+    local to_normalized = vim.fs.normalize(to)
+
+    local common_parent, distance = find_closest_common_parent(from_normalized, to_normalized)
+    local relative_path_component = distance == 0 and "." or (".."):rep(distance, "/")
+    return vim.fs.joinpath(relative_path_component, to_normalized:sub(#common_parent + 1))
 end
 
 return M
-- 
cgit v1.2.3-70-g09d2