add function to replace special characters to undercores

Author: milancurcic

fpm/src/fpm_filesystem.f90

@@ -2,11 +2,11 @@ module fpm_filesystem
     use fpm_environment, only: get_os_type, &
                                OS_UNKNOWN, OS_LINUX, OS_MACOS, OS_WINDOWS, &
                                OS_CYGWIN, OS_SOLARIS, OS_FREEBSD
-    use fpm_strings, only: f_string, string_t, split
+    use fpm_strings, only: f_string, replace, string_t, split
     implicit none
     private
     public :: basename, canon_path, dirname, is_dir, join_path, number_of_rows, read_lines, list_files, env_variable, &
-            mkdir, exists, get_temp_filename, windows_path, unix_path, getline, delete_file
+            mkdir, exists, get_temp_filename, windows_path, unix_path, getline, delete_file, to_fortran_name
 
     integer, parameter :: LINE_BUFFER_LEN = 1000
 
@@ -465,4 +465,15 @@ subroutine delete_file(file)
 end subroutine delete_file
 
 
+pure function to_fortran_name(string) result(res)
+    ! Returns string with special characters replaced with an underscore.
+    ! For now, only a hyphen is treated as a special character, but this can be
+    ! expanded to other characters if needed.
+    character(*), intent(in) :: string
+    character(len(string)) :: res
+    character, parameter :: SPECIAL_CHARACTERS(*) = ['-']
+    res = replace(string, SPECIAL_CHARACTERS, '_')
+end function to_fortran_name
+
+
 end module fpm_filesystem