Str() + doc getdp compatibility syntax

Parser/Gmsh.y

@@ -5069,6 +5069,23 @@ StringExpr :
       Free($5);
       Free($7);
     }
+  | tStr '(' RecursiveListOfStringExprVar ')'
+    {
+      int size = 0;
+      for(int i = 0; i < List_Nbr($3); i++)
+        size += strlen(*(char**)List_Pointer($3, i)) + 1;
+      $$ = (char*)Malloc(size * sizeof(char));
+      $$[0] = '\0';
+      for(int i = 0; i < List_Nbr($3); i++){
+        char *s;
+        List_Read($3, i, &s);
+        strcat($$, s);
+        Free(s);
+        if(i != List_Nbr($3) - 1) strcat($$, "\n");
+      }
+      List_Delete($3);
+    }
+  // for compatibility with GetDP
   | tStr '[' RecursiveListOfStringExprVar ']'
     {
       int size = 0;

doc/texinfo/gmsh.texi

@@ -1080,7 +1080,7 @@ Character expressions are defined as:
   StrPrefix ( @var{char-expression} ) |
   StrRelative ( @var{char-expression} ) |
   StrCat ( @var{char-expression} , @var{char-expression} ) |
-  Str [ @var{char-expression} , @dots{} ] |
+  Str ( @var{char-expression} , @dots{} ) |
   Sprintf ( @var{char-expression} , @var{expression-list} ) |
   Sprintf ( @var{char-expression} ) |
   Sprintf ( @var{char-option} ) |
@@ -1100,7 +1100,9 @@ etc.) The various @w{@var{char-option}s} are listed in
 @ref{Options}. @code{GetEnvThe} gets the value of an environment
 variable from the operating system. @code{GetString} allows to ask the
 user for a value interactively. @code{StrReplace}'s arguments are: input
-string, old substring, new substring.
+string, old substring, new substring.@footnote{For compatibility with GetDP
+(@uref{http://geuz.org/getdp/}), parentheses can be replaced by brackets
+@code{[]} in @code{Str} and @code{Sprintf}.}
 
 Character expressions are mostly used to specify non-numeric options and
 input/output file names. See @ref{t8.geo}, for an interesting usage of