[lldb/interpreter] Improve REPL init file compatibility

[mib]

Summary

This patch changes the command interpreter sourcing logic for the REPL
init file. Instead of looking for a arbitrary file name, it standardizes
the REPL init file name to match to following scheme:

`.lldbinit-<language>-repl`

This will make the naming more homogenous and the sourcing logic future-proof.

rdar://65836048

Signed-off-by: Med Ismail Bennani <[e-mail]>

lldb/docs/man/lldb.rst

 .lldbinit file.
 
 First, :program:`lldb` will try to read the application specific init file
 whose name is ~/.lldbinit followed by a "-" and the name of the current
 program. This would be ~/.lldbinit-lldb for the command line :program:`lldb`
 and ~/.lldbinit-Xcode for Xcode. If there is no application specific init
 file, :program:`lldb` will look for an init file in the home directory.
 If launched with a `REPL`_ option, it will first look for a REPL configuration
-file, specific to the REPL language. If this file doesn't exist, or :program:`lldb`
-wasn't launch with `REPL`_, meaning there is neither a REPL init file nor an
-application specific init file, `lldb` will fallback to the global ~/.lldbinit.
+file, specific to the REPL language. The init file should be named as follow:
+`.lldbinit-<language>-repl` (i.e. `.lldbinit-swift-repl`). If this file doesn't
+exist, or :program:`lldb` wasn't launch with `REPL`_, meaning there is neither
+a REPL init file nor an application specific init file, `lldb` will fallback to
+the global ~/.lldbinit.
 
 Secondly, it will look for an .lldbinit file in the current working directory.
 For security reasons, :program:`lldb` will print a warning and not source this
 file by default. This behavior can be changed by changing the
 target.load-cwd-lldbinit setting.
 
 To always load the .lldbinit file in the current working directory, add the
 following command to ~/.lldbinit:

lldb/source/Interpreter/CommandInterpreter.cpp

 #include "lldb/Interpreter/CommandCompletions.h"
 #include "lldb/Interpreter/CommandInterpreter.h"
 #include "lldb/Interpreter/CommandReturnObject.h"
 #include "lldb/Interpreter/OptionValueProperties.h"
 #include "lldb/Interpreter/Options.h"
 #include "lldb/Interpreter/Property.h"
 #include "lldb/Utility/Args.h"
 
+#include "lldb/Target/Language.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/StopInfo.h"
 #include "lldb/Target/TargetList.h"
 #include "lldb/Target/Thread.h"
 #include "lldb/Target/UnixSignals.h"
 
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
static void GetHomeInitFile(llvm::SmallVectorImpl<char> &init_file,
   FileSystem::Instance().GetHomeDirectory(init_file);
   llvm::sys::path::append(init_file, init_file_name);
 
   FileSystem::Instance().Resolve(init_file);
 }
 
 static void GetHomeREPLInitFile(llvm::SmallVectorImpl<char> &init_file,
                                 LanguageType language) {
-  std::string init_file_name;
-
-  switch (language) {
-  // TODO: Add support for a language used with a REPL.
-  default:
+  if (language == LanguageType::eLanguageTypeUnknown)
     return;
-  }
 
+  std::string init_file_name =
+      (llvm::Twine(".lldbinit-") +
+       llvm::Twine(Language::GetNameForLanguageType(language)) +
+       llvm::Twine("-repl"))
+          .str();
   FileSystem::Instance().GetHomeDirectory(init_file);
   llvm::sys::path::append(init_file, init_file_name);
-
   FileSystem::Instance().Resolve(init_file);
 }
 
 static void GetCwdInitFile(llvm::SmallVectorImpl<char> &init_file) {
   llvm::StringRef s = ".lldbinit";
   init_file.assign(s.begin(), s.end());
   FileSystem::Instance().Resolve(init_file);
 }

lldb/tools/driver/Driver.cpp

if ((isatty(STDIN_FILENO) != 0) &&
       ::ioctl(STDIN_FILENO, TIOCGWINSZ, &window_size) == 0) {
     if (window_size.ws_col > 0)
       m_debugger.SetTerminalWidth(window_size.ws_col);
   }
 
   SBCommandInterpreter sb_interpreter = m_debugger.GetCommandInterpreter();
 
   // Before we handle any options from the command line, we parse the
-  // .lldbinit file in the user's home directory.
+  // REPL init file or the default file in the user's home directory.
   SBCommandReturnObject result;
   sb_interpreter.SourceInitFileInHomeDirectory(result, m_option_data.m_repl);
   if (m_option_data.m_debug_mode) {
     result.PutError(m_debugger.GetErrorFile());
     result.PutOutput(m_debugger.GetOutputFile());
   }
 
   // Source the local .lldbinit file if it exists and we're allowed to source.