Extend logic to detect BCP47 languages (#6986)

Co-authored-by: Lars Hvam <larshp@hotmail.com>

src/objects/core/zcl_abapgit_filename_logic.clas.abap

@@ -112,6 +112,15 @@ CLASS zcl_abapgit_filename_logic DEFINITION
       RAISING
         zcx_abapgit_exception.
 
+    CLASS-METHODS get_lang_and_ext
+      IMPORTING
+        iv_filename TYPE string
+      EXPORTING
+        ev_lang     TYPE laiso
+        ev_ext      TYPE string
+      RAISING
+        zcx_abapgit_exception.
+
 ENDCLASS.
 
 
@@ -184,7 +193,7 @@ CLASS zcl_abapgit_filename_logic IMPLEMENTATION.
 
     DATA lo_dot TYPE REF TO zcl_abapgit_dot_abapgit.
 
-    CLEAR: ev_lang, ev_ext.
+    CLEAR: es_item, ev_lang, ev_ext.
     lo_dot = zcl_abapgit_dot_abapgit=>build_default( ).
 
     file_to_object(
@@ -195,8 +204,12 @@ CLASS zcl_abapgit_filename_logic IMPLEMENTATION.
       IMPORTING
         es_item     = es_item ).
 
-    FIND FIRST OCCURRENCE OF REGEX 'i18n\.([^.]{2})\.([^.]+)$' IN iv_filename
-      SUBMATCHES ev_lang ev_ext ##SUBRC_OK.
+    get_lang_and_ext(
+      EXPORTING
+        iv_filename = iv_filename
+      IMPORTING
+        ev_lang     = ev_lang
+        ev_ext      = ev_ext ).
 
   ENDMETHOD.
 
@@ -358,4 +371,38 @@ CLASS zcl_abapgit_filename_logic IMPLEMENTATION.
       iv_ext   = iv_ext ).
 
   ENDMETHOD.
+
+  METHOD get_lang_and_ext.
+
+    DATA lt_filename_elements TYPE string_table.
+    DATA lv_langu_bcp47 TYPE string.
+    DATA lv_sap1 TYPE sy-langu.
+
+    SPLIT iv_filename AT '.' INTO TABLE lt_filename_elements.
+
+    READ TABLE lt_filename_elements INDEX lines( lt_filename_elements ) INTO ev_ext.
+    IF sy-subrc <> 0.
+      zcx_abapgit_exception=>raise( |Could not derive file extension of file { iv_filename }| ).
+    ENDIF.
+
+    READ TABLE lt_filename_elements WITH KEY table_line = `i18n` TRANSPORTING NO FIELDS.
+    IF sy-subrc = 0.
+      READ TABLE lt_filename_elements INDEX ( sy-tabix + 1 ) INTO lv_langu_bcp47.
+      IF sy-subrc = 0.
+        lv_sap1 = zcl_abapgit_convert=>language_bcp47_to_sap1( lv_langu_bcp47 ).
+        ev_lang = zcl_abapgit_convert=>language_sap1_to_sap2( lv_sap1 ). " actually it is to_upper( ISO-639 )
+
+        " to not break existing PO file implementations
+        IF ev_ext = `po`.
+          ev_lang = to_lower( ev_lang ).
+        ENDIF.
+      ENDIF.
+    ENDIF.
+
+    IF ev_lang IS INITIAL.
+      CLEAR ev_ext.
+    ENDIF.
+
+  ENDMETHOD.
+
 ENDCLASS.

src/objects/core/zcl_abapgit_filename_logic.clas.testclasses.abap

@@ -451,7 +451,7 @@ CLASS ltcl_run_checks IMPLEMENTATION.
       exp = 'ZPROGRAM'
       act = ls_item-obj_name ).
     cl_abap_unit_assert=>assert_equals(
-      exp = 'en'
+      exp = 'EN'
       act = lv_lang ).
     cl_abap_unit_assert=>assert_equals(
       exp = 'properties'

src/objects/core/zcl_abapgit_objects_files.clas.testclasses.abap

@@ -54,7 +54,7 @@ CLASS ltcl_objects_files IMPLEMENTATION.
     APPEND INITIAL LINE TO lt_files ASSIGNING <ls_files>.
     <ls_files>-filename = 'zlf.prog.i18n.es.po'.
     APPEND INITIAL LINE TO lt_files ASSIGNING <ls_files>.
-    <ls_files>-filename = 'zlf.prog.i18n.cz.other'.
+    <ls_files>-filename = 'zlf.prog.i18n.cs.other'.
 
     " object type and name are upper case
     ls_item-obj_type = 'PROG'.