Create an interactive porting tool

`blueprint-compiler port` interactively ports a project to blueprint.
It will create the subproject wrap file, add it to .gitignore, decompile
your GtkBuilder XML files, emit code to copy and paste into your
meson.build file, and update POTFILES.in.

It can't quite handle all of the features the forward compiler can, so
it will skip those files.

blueprintcompiler/main.py

@@ -20,9 +20,10 @@
 
 import argparse, json, os, sys
 
-from .errors import PrintableError, report_compile_error, MultipleErrors
+from .errors import PrintableError, report_bug, MultipleErrors
 from .lsp import LanguageServer
-from . import parser, tokenizer
+from . import parser, tokenizer, decompiler, interactive_port
+from .utils import Colors
 from .xml_emitter import XmlEmitter
 
 
@@ -44,6 +45,8 @@ class BlueprintApp:
         batch_compile.add_argument("input_dir", metavar="input-dir")
         batch_compile.add_argument("inputs", nargs="+", metavar="filenames", default=sys.stdin, type=argparse.FileType('r'))
 
+        port = self.add_subcommand("port", "Interactive porting tool", self.cmd_port)
+
         lsp = self.add_subcommand("lsp", "Run the language server (for internal use by IDEs)", self.cmd_lsp)
         lsp.add_argument("--logfile", dest="logfile", default=None, type=argparse.FileType('a'))
 
@@ -54,8 +57,12 @@ class BlueprintApp:
             opts.func(opts)
         except SystemExit as e:
             raise e
+        except KeyboardInterrupt:
+            print(f"\n\n{Colors.RED}{Colors.BOLD}Interrupted.{Colors.CLEAR}")
+        except EOFError:
+            print(f"\n\n{Colors.RED}{Colors.BOLD}Interrupted.{Colors.CLEAR}")
         except:
-            report_compile_error()
+            report_bug()
 
 
     def add_subcommand(self, name, help, func):
@@ -114,6 +121,10 @@ class BlueprintApp:
         langserv.run()
 
 
+    def cmd_port(self, opts):
+        interactive_port.run(opts)
+
+
     def _compile(self, data: str) -> str:
         tokens = tokenizer.tokenize(data)
         ast, errors = parser.parse(tokens)