From eafa6e86f7f4a5b3fa11b137d6926202a010771b Mon Sep 17 00:00:00 2001
From: myk002 <myk002@yahoo.com>
Date: Tue, 29 Jun 2021 12:22:05 -0700
Subject: [PATCH] add utils.normalizePath()

---
 library/lua/utils.lua  |  7 +++++++
 test/library/utils.lua | 14 ++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/library/lua/utils.lua b/library/lua/utils.lua
index b0bc70af4..39a6c156e 100644
--- a/library/lua/utils.lua
+++ b/library/lua/utils.lua
@@ -544,6 +544,13 @@ function check_number(text)
     return nv ~= nil, nv
 end
 
+-- Normalize directory separator slashes across platforms to '/' and collapse
+-- adjacent slashes into a single slash.
+local platformSlash = package.config:sub(1,1)
+function normalizePath(path)
+    return path:gsub(platformSlash, '/'):gsub('/+', '/')
+end
+
 function invert(tab)
     local result = {}
     for k,v in pairs(tab) do
diff --git a/test/library/utils.lua b/test/library/utils.lua
index b2c63dafd..6232bd9a2 100644
--- a/test/library/utils.lua
+++ b/test/library/utils.lua
@@ -14,6 +14,20 @@ function test.OrderedTable()
     end
 end
 
+function test.normalizePath()
+    expect.eq('imapath/file.csv', utils.normalizePath('imapath/file.csv'))
+    expect.eq('/ima/path', utils.normalizePath('/ima/path'))
+    expect.eq('ima/path', utils.normalizePath('ima//path'))
+
+    expect.eq('imapath', utils.normalizePath('imapath'))
+    expect.eq('/imapath', utils.normalizePath('/imapath'))
+    expect.eq('/imapath', utils.normalizePath('//imapath'))
+    expect.eq('/imapath', utils.normalizePath('///imapath'))
+
+    expect.eq('imapath/', utils.normalizePath('imapath/'))
+    expect.eq('imapath/', utils.normalizePath('imapath//'))
+end
+
 function test.invert()
     local t = {}
     local i = utils.invert{'a', 4.4, false, true, 5, t}