Ignore hidden source files (#654)

* Add str_begins_with_str function
* Add function to test if a single file is hidden
* Exclude hidden files when finding source files

3 files changed, 30 insertions, 6 deletions

diff --git a/src/fpm_filesystem.F90 b/src/fpm_filesystem.F90
index 83cffe7..6837fef 100644
--- a/src/fpm_filesystem.F90
+++ b/src/fpm_filesystem.F90
@@ -6,7 +6,7 @@ module fpm_filesystem
                                OS_UNKNOWN, OS_LINUX, OS_MACOS, OS_WINDOWS, &
                                OS_CYGWIN, OS_SOLARIS, OS_FREEBSD, OS_OPENBSD
     use fpm_environment, only: separator, get_env
-    use fpm_strings, only: f_string, replace, string_t, split, notabs
+    use fpm_strings, only: f_string, replace, string_t, split, notabs, str_begins_with_str
     use iso_c_binding, only: c_char, c_ptr, c_int, c_null_char, c_associated, c_f_pointer
     use fpm_error, only : fpm_stop
     implicit none
@@ -14,6 +14,7 @@ module fpm_filesystem
     public :: basename, canon_path, dirname, is_dir, join_path, number_of_rows, list_files, env_variable, &
             mkdir, exists, get_temp_filename, windows_path, unix_path, getline, delete_file
     public :: fileopen, fileclose, filewrite, warnwrite, parent_dir
+    public :: is_hidden_file
     public :: read_lines, read_lines_expanded
     public :: which
 
@@ -250,6 +251,15 @@ logical function is_dir(dir)
 
 end function is_dir
 
+!> test if a file is hidden
+logical function is_hidden_file(file_basename) result(r)
+    character(*), intent(in) :: file_basename
+    if (len(file_basename) <= 2) then
+        r = .false.
+    else
+        r = str_begins_with_str(file_basename, '.')
+    end if
+end function is_hidden_file
 
 !> Construct path by joining strings with os file separator
 function join_path(a1,a2,a3,a4,a5) result(path)
diff --git a/src/fpm_sources.f90 b/src/fpm_sources.f90
index af2870f..05b9bc1 100644
--- a/src/fpm_sources.f90
+++ b/src/fpm_sources.f90
@@ -6,7 +6,7 @@
 module fpm_sources
 use fpm_error, only: error_t
 use fpm_model, only: srcfile_t, FPM_UNIT_PROGRAM
-use fpm_filesystem, only: basename, canon_path, dirname, join_path, list_files
+use fpm_filesystem, only: basename, canon_path, dirname, join_path, list_files, is_hidden_file
 use fpm_strings, only: lower, str_ends_with, string_t, operator(.in.)
 use fpm_source_parsing, only: parse_f_source, parse_c_source
 use fpm_manifest_executable, only: executable_config_t
@@ -81,9 +81,10 @@ subroutine add_sources_from_dir(sources,directory,scope,with_executables,recurse
         allocate(existing_src_files(0))
     end if
 
-    is_source = [(.not.(canon_path(file_names(i)%s) .in. existing_src_files) .and. &
-                  (str_ends_with(lower(file_names(i)%s), fortran_suffixes) .or. &
-                   str_ends_with(lower(file_names(i)%s),[".c",".h"]) ),i=1,size(file_names))]
+    is_source = [(.not.(is_hidden_file(basename(file_names(i)%s))) .and. &
+                 .not.(canon_path(file_names(i)%s) .in. existing_src_files) .and. &
+                 (str_ends_with(lower(file_names(i)%s), fortran_suffixes) .or. &
+                 str_ends_with(lower(file_names(i)%s),[".c",".h"]) ),i=1,size(file_names))]
     src_file_names = pack(file_names,is_source)
 
     allocate(dir_sources(size(src_file_names)))
diff --git a/src/fpm_strings.f90 b/src/fpm_strings.f90
index 4650ebd..aceb01a 100644
--- a/src/fpm_strings.f90
+++ b/src/fpm_strings.f90
@@ -39,7 +39,7 @@ use iso_c_binding, only: c_char, c_ptr, c_int, c_null_char, c_associated, c_f_po
 implicit none
 
 private
-public :: f_string, lower, split, str_ends_with, string_t
+public :: f_string, lower, split, str_ends_with, string_t, str_begins_with_str
 public :: to_fortran_name, is_fortran_name
 public :: string_array_contains, string_cat, len_trim, operator(.in.), fnv_1a
 public :: replace, resize, str, join, glob
@@ -115,6 +115,19 @@ pure logical function str_ends_with_any(s, e) result(r)
 
 end function str_ends_with_any
 
+!> test if a CHARACTER string begins with a specified prefix
+pure logical function str_begins_with_str(s, e) result(r)
+    character(*), intent(in) :: s, e
+    integer :: n1, n2
+    n1 = 1
+    n2 = 1 + len(e)-1
+    if (n2 > len(s)) then
+        r = .false.
+    else
+        r = (s(n1:n2) == e)
+    end if
+end function str_begins_with_str
+
 !> return Fortran character variable when given a C-like array of
 !! single characters terminated with a C_NULL_CHAR character
 function f_string(c_string)