test: "$PATHEXT=::"

src/nvim/os/fs.c

@@ -297,9 +297,9 @@ static bool is_executable(const char *name, char_u **abspath)
 }
 
 #ifdef WIN32
-/// Checks if file `name` is executable under one of these conditions:
+/// Checks if file `name` is executable under any of these conditions:
-/// - if the file extension is in $PATHEXT and `name` is executable
+/// - extension is in $PATHEXT and `name` is executable
-/// - if the result of any $PATHEXT extension appended to `name` is executable
+/// - result of any $PATHEXT extension appended to `name` is executable
 static bool is_executable_ext(char *name, char_u **abspath)
   FUNC_ATTR_NONNULL_ARG(1)
 {
@@ -318,7 +318,7 @@ static bool is_executable_ext(char *name, char_u **abspath)
       if (is_executable(name, abspath)) {
         return true;
       }
-      // Skip the extension.
+      // Skip it.
       ext++;
       continue;
     }

test/functional/eval/executable_spec.lua

@@ -136,7 +136,14 @@ describe('executable() (Windows)', function()
     eq(1, call('executable', '.\\test_executable_zzz'))
   end)
 
-  it('returns 1 for any existing filename, when a Unix-shell like \'shell\'', function()
+  it("with weird $PATHEXT", function()
+    clear({env={PATHEXT=';'}})
+    eq(0, call('executable', '.\\test_executable_zzz'))
+    clear({env={PATHEXT=';;;.zzz;;'}})
+    eq(1, call('executable', '.\\test_executable_zzz'))
+  end)
+
+  it("unqualified filename, Unix-style 'shell'", function()
     clear({env={PATHEXT=''}})
     command('set shell=sh')
     for _,ext in ipairs(exts) do
@@ -145,7 +152,7 @@ describe('executable() (Windows)', function()
     eq(1, call('executable', 'test_executable_zzz.zzz'))
   end)
 
-  it('returns 1 for any existing path, when a Unix-shell like \'shell\' (backslashes)', function()
+  it("relative path, Unix-style 'shell' (backslashes)", function()
     clear({env={PATHEXT=''}})
     command('set shell=bash.exe')
     for _,ext in ipairs(exts) do
@@ -156,7 +163,7 @@ describe('executable() (Windows)', function()
     eq(1, call('executable', './test_executable_zzz.zzz'))
   end)
 
-  it('returns 1 for any existing filename, when $PATHEXT contain dot itself', function()
+  it('unqualified filename, $PATHEXT contains dot', function()
     clear({env={PATHEXT='.;.zzz'}})
     for _,ext in ipairs(exts) do
       eq(1, call('executable', 'test_executable_'..ext..'.'..ext))
@@ -169,7 +176,7 @@ describe('executable() (Windows)', function()
     eq(1, call('executable', 'test_executable_zzz.zzz'))
   end)
 
-  it('returns 1 for any existing path, when $PATHEXT contain dot itself (backslashes)', function()
+  it('relative path, $PATHEXT contains dot (backslashes)', function()
     clear({env={PATHEXT='.;.zzz'}})
     for _,ext in ipairs(exts) do
       eq(1, call('executable', '.\\test_executable_'..ext..'.'..ext))
@@ -179,12 +186,12 @@ describe('executable() (Windows)', function()
     eq(1, call('executable', './test_executable_zzz.zzz'))
   end)
 
-  it('ignore case of extension', function()
+  it('ignores case of extension', function()
     clear({env={PATHEXT='.ZZZ'}})
     eq(1, call('executable', 'test_executable_zzz.zzz'))
   end)
 
-  it('file is not found by relative path from $PATH', function()
+  it('relative path does not search $PATH', function()
     clear({env={PATHEXT=''}})
     eq(0, call('executable', './System32/notepad.exe'))
     eq(0, call('executable', '.\\System32\\notepad.exe'))

test/functional/eval/exepath_spec.lua

@@ -5,7 +5,7 @@ local eq, clear, call, iswin =
 describe('exepath() (Windows)', function()
   if not iswin() then return end  -- N/A for Unix.
 
-  it('append extension, even if omit extension', function()
+  it('append extension if omitted', function()
     local filename = 'cmd'
     local pathext = '.exe'
     clear({env={PATHEXT=pathext}})