Commits on Sep 21, 2023

1. Honor the -w flag in REPL mode. …

   Right now, `-w` (write-decls-and-statements) is only used when gomacro
   is called with file arguments.  But it might be useful to save a
   record of what was run for interactive mode as well.  For instance,
   you might want to play around with some code interactively, save the
   results, and then use that as the basis of writing a script.
   
   This PR makes it so `-w` is respected when run as a REPL.  In the
   existing (file-based) usage, the output of `-w` is based on the
   filename.  For the new, REPL case there's nothing to base the ouptut
   filename on, so I just hard-code a name.
   
   Test plan:
   I ran the following:
   ```
   gomacro% go run . -w
   // Welcome to gomacro. Type :help for help, :copy for copyright and license.
   // This is free software with ABSOLUTELY NO WARRANTY.
   gomacro> func() { return 5; }
   repl.go:1:8: expected 'IDENT', found '{'
   gomacro> func a() { return 5; }
   return: expecting 0 expressions, found 1: return 5
   gomacro> a := func() int { return 5 }
   gomacro> :exit
   
   gomacro% cat repl.go
   // -------------------------------------------------------------
   // DO NOT EDIT! this file was generated automatically by gomacro
   // Any change will be lost when the file is re-generated
   // -------------------------------------------------------------
   
   // REPL run: 2023-09-21T13:42:27-07:00
   package main
   
   func a() { return 5 }
   var a = func() { return 5 }
   var a = func() int { return 5 }
   ```
   which shows that the declarations are being saved and emitted as
   expected.

   

   csilvers committed Sep 21, 2023
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