Merged Tom Dunstan's debugger readline patch. Define

HAVE_READLINE to enable it.

svn-id: r3500

1 files changed, 86 insertions, 0 deletions

diff --git a/debugrl.cpp b/debugrl.cpp
new file mode 100644
index 0000000000..86d72327a0
--- /dev/null
+++ b/debugrl.cpp
@@ -0,0 +1,86 @@
+#ifdef HAVE_READLINE
+
+#include "debugrl.h"
+
+// A lot of this was ripped straight from the readline fileman.c example.
+
+char* _debugger_commands[] = {
+  "help",
+  "quit",
+  "go",
+  "actor",
+  "scripts",
+  "exit",
+  (char *)NULL
+};
+
+
+// forwards decls
+char ** scumm_debugger_completion (const char *text, int start, int end);
+char * scumm_debugger_command_generator (const char *text, int state);
+
+void initialize_readline () {
+  /* Allow conditional parsing of the ~/.inputrc file. */
+  rl_readline_name = "scummvm";
+
+  /* Tell the completer that we want a crack first. */
+  rl_attempted_completion_function = scumm_debugger_completion;
+}
+
+char ** scumm_debugger_completion (const char *text, int start, int end) {
+
+  char **matches;
+
+  matches = (char **)NULL;
+
+  // If this word is at the start of the line, then it is a command
+  // to complete.
+  if (start == 0) {
+    matches = rl_completion_matches (text, scumm_debugger_command_generator);
+  } else {
+    // At some stage it'd be nice to have symbolic actor name completion
+    // or something similarly groovy. Not right now though.
+  }
+
+  // This just makes sure that readline doesn't try to use its default
+  // completer, which uses filenames in the current dir, if we can't find 
+  // a match, since filenames don't have much use in the debuger :)
+  // There's probably a nice way to do this once, rather than every time.
+  rl_attempted_completion_over = 1;
+  
+  return (matches);
+}
+
+
+/* Generator function for command completion.  STATE lets us know whether
+   to start from scratch; without any state (i.e. STATE == 0), then we
+   start at the top of the list. */
+char * scumm_debugger_command_generator (const char *text, int state) {
+
+  static int list_index, len;
+  char *name;
+
+  /* If this is a new word to complete, initialize now.  This includes
+     saving the length of TEXT for efficiency, and initializing the index
+     variable to 0. */
+  if (!state)
+    {
+      list_index = 0;
+      len = strlen (text);
+    }
+
+  /* Return the next name which partially matches from the command list. */
+  while (name = _debugger_commands[list_index])
+    {
+      list_index++;
+
+      if (strncmp (name, text, len) == 0)
+        //return (dupstr(name));
+        return strdup(name);
+    }
+
+  /* If no names matched, then return NULL. */
+  return ((char *)NULL);
+}
+
+#endif /* HAVE_READLINE */