Add [lreplace], based on partcl's PIR version but in NQP.

All tests pass, enable the test file.

build/Makefile.in

@@ -75,6 +75,7 @@ TEST_FILES = \
   t/cmd_llength.t \
   t/cmd_lrange.t \
   t/cmd_lrepeat.t \
+  t/cmd_lreplace.t \
   t/cmd_lreverse.t \
   t/cmd_lset.t \
   t/cmd_split.t \
@@ -90,7 +91,7 @@ TEST_FILES = \
 # t/cmd_catch.t t/cmd_continue.t t/cmd_eval.t t/cmd_expr.t t/cmd_file.t
 # t/cmd_fileevent.t t/cmd_foreach.t t/cmd_format.t t/cmd_gets.t
 # t/cmd_global.t t/cmd_if.t t/cmd_info.t t/cmd_lappend.t t/cmd_linsert.t
-# t/cmd_lreplace.t t/cmd_lsort.t t/cmd_namespace.t
+# t/cmd_lsort.t t/cmd_namespace.t
 # t/cmd_proc.t t/cmd_regexp.t t/cmd_return.t t/cmd_set.t t/cmd_socket.t
 # t/cmd_subst.t t/cmd_switch.t t/cmd_trace.t t/cmd_unset.t t/cmd_upvar.t
 # t/cmd_variable.t t/cmd_vwait.t t/tcl_backslash.t t/tcl_conversion.t

src/Partcl/commands/main.pm

@@ -477,6 +477,35 @@ our sub lrepeat(*@args) {
 }
 
 our sub lreplace(*@args) {
+    if +@args < 3 {
+        error('wrong # args: should be "lreplace list first last ?element element ...?"');
+    }
+
+    my @list := pir::clone__pp(@args.shift().getList());
+
+    my $first := @list.getIndex(@args.shift());
+    my $last  := @list.getIndex(@args.shift());
+
+    if +@list == 0 {
+        pir::splice__vppii(@list, @args, 0, 0);
+        return @list;
+    }
+
+    $last := +@list -1 if $last >= +@list;
+    $first := 0 if $first < 0;
+
+    if $first >= +@list {
+        error("list doesn't contain element $first");
+    }
+
+    my $count := $last - $first + 1;
+    if $count >= 0 {
+        pir::splice__vppii(@list, @args, $first, $count);
+        return @list;
+    }
+
+    pir::splice__vppii(@list, @args, $first, 0);
+    return @list;
 }
 
 our sub lreverse(*@args) {