Add path_separator() with tests

src/stdlib_io_filesystem.F90

@@ -6,10 +6,9 @@ module stdlib_io_filesystem
     implicit none
     private
 
-    public :: temp_dir, is_windows, exists, list_dir, mkdir, rmdir, run
+    public :: temp_dir, is_windows, exists, path_separator, list_dir, mkdir, rmdir, run
 
     character(*), parameter :: temp_dir = 'temp'
-    character(*), parameter :: listed_contents = temp_dir//'/listed_contents.txt'
 
 contains
 
@@ -34,6 +33,18 @@ logical function is_windows()
         is_windows = .false.
     end
 
+    !> Version: experimental
+    !>
+    !> Separator for paths.
+    !> [Specification](../page/specs/stdlib_io.html#path_separator)
+    character function path_separator()
+        if (is_windows()) then
+            path_separator = '\'
+        else
+            path_separator = '/'
+        end if
+    end
+
     !> Version: experimental
     !>
     !> Whether a file or directory exists at the given path.
@@ -65,6 +76,7 @@ subroutine list_dir(dir, files, iostat, iomsg)
 
         integer :: unit, stat
         character(len=256) :: line
+        character(:), allocatable :: listed_contents
 
         stat = 0
 
@@ -77,6 +89,8 @@ subroutine list_dir(dir, files, iostat, iomsg)
             end if
         end if
 
+        listed_contents = temp_dir//path_separator()//'listed_contents.txt'
+
         if (is_windows()) then
             call run('dir /b '//dir//' > '//listed_contents, stat)
         else

test/io/test_filesystem.f90

@@ -21,6 +21,7 @@ subroutine collect_filesystem(testsuite)
             new_unittest("fs_file_not_exists", fs_file_not_exists, should_fail=.true.), &
             new_unittest("fs_file_exists", fs_file_exists), &
             new_unittest("fs_current_dir_exists", fs_current_dir_exists), &
+            new_unittest("fs_path_separator", fs_path_separator), &
             new_unittest("fs_run_invalid_command", fs_run_invalid_command, should_fail=.true.), &
             new_unittest("fs_run_with_invalid_option", fs_run_with_invalid_option, should_fail=.true.), &
             new_unittest("fs_run_valid_command", fs_run_valid_command), &
@@ -80,6 +81,21 @@ subroutine fs_current_dir_exists(error)
         call check(error, is_existing, "Current directory should not fail.")
     end
 
+    subroutine fs_path_separator(error)
+        type(error_type), allocatable, intent(out) :: error
+
+        character(*), parameter :: outer_dir = "path_separator_outer"
+        character(*), parameter :: inner_dir = "path_separator_inner"
+
+        call rmdir(outer_dir)
+        call check(error, .not. exists(outer_dir), "Directory should not exist.")
+        call mkdir(outer_dir)
+        call check(error, exists(outer_dir), "Outer directory should now exist.")
+        call mkdir(outer_dir//path_separator()//inner_dir)
+        call check(error, exists(outer_dir//path_separator()//inner_dir), "Inner directory should now exist.")
+        call rmdir(outer_dir)
+    end
+
     subroutine fs_run_invalid_command(error)
         type(error_type), allocatable, intent(out) :: error