readline tab completion for mail

@@ -35,35 +35,19 @@ mail_help (int argc, char **argv)
     }
   else
     {
-      int status = 0;
-      int command = 0;
-      while (++command < argc)
+      int status = 0, cmd = 0;
+      while (++cmd < argc)
 	{
-	  char *cmd = argv[command];
-	  int i = 0, printed = 0, sl = 0, ll = 0, len = strlen (cmd);
-	  while (mail_command_table[i].shortname != 0 && printed == 0)
+	  struct mail_command_entry entry = util_find_entry (argv[cmd]);
+	  if (entry.synopsis != NULL)
+	    printf ("%s\n", entry.synopsis);
+	  else
 	    {
-	      sl = strlen (mail_command_table[i].shortname);
-	      ll = strlen (mail_command_table[i].longname);
-	      if (sl == len && !strcmp (mail_command_table[i].shortname, cmd))
-		{
-		  printed = 1;
-		  printf ("%s\n", mail_command_table[i].synopsis);
-		}
-	      else if (sl < len && !strncmp (mail_command_table[i].longname,
-					     cmd, len))
-		{
-		  printed = 1;
-		  printf ("%s\n", mail_command_table[i].synopsis);
-		}
-	      i++;
-	    }
-	  if (printed == 0)
-	    {
-	      printf ("Unknown command: %s\n", cmd);
 	      status = 1;
+	      printf ("Unknown command: %s\n", argv[cmd]);
 	    }
 	}
+      return status;
     }
   return 1;
 }

@@ -113,7 +113,7 @@ static struct argp argp = { options, parse_opt, args_doc, doc };
 int
 main (int argc, char **argv)
 {
-  char *command = NULL;
+  char *command = NULL, *cmd = NULL;
   char *from[] = { "from", "*" };
   struct arguments args;
 
@@ -163,12 +163,32 @@ main (int argc, char **argv)
     mail_from (1, from);
   cursor = realcursor;
 
+  /* Initialize readline */
+  rl_readline_name = "mail";
+  rl_attempted_completion_function = (CPPFunction *)util_command_completion;
+
   while (1)
     {
+      int len;
       free (command);
       command = readline ("? ");
-      util_do_command (command);
-      add_history (command);
+      len = strlen (command);
+      while (command[len-1] == '\\')
+	{
+	  char *buf;
+	  char *command2 = readline ("> ");
+
+	  command[len-1] = '\0';
+	  buf = malloc ((len + strlen (command2)) * sizeof (char));
+	  strcpy (buf, command);
+	  strcat (buf, command2);
+	  free (command);
+	  command = buf;
+	  len = strlen (command);
+	}
+      cmd = util_stripwhite (command);
+      util_do_command (cmd);
+      add_history (cmd);
     }
 }
 

@@ -110,8 +110,11 @@ int util_get_argcv __P((const char *command, int *argc, char ***argv));
 int util_expand_msglist __P((const int argc, char **argv, int **list));
 int util_do_command __P((const char *cmd));
 int util_msglist_command __P((int (*func)(int, char**), int argc, char **argv));
-int* util_command_get __P((char *cmd));
+Function* util_command_get __P((char *cmd));
 int util_free_argv __P((int argc, char **argv));
+char **util_command_completion __P((char *cmd, int start, int end));
+char *util_command_generator __P((char *text, int state));
+char *util_stripwhite __P((char *string));
 
 #ifdef __cplusplus
 }

@@ -35,10 +35,12 @@ extern "C" {
 struct mail_command_entry {
   char *shortname;
   char *longname;
-  int (*func) __P((int, char**));
+  Function *func;
   char *synopsis;
 };
 
+struct mail_command_entry util_find_entry __P((char *cmd));
+
 static struct mail_command_entry mail_command_table[] = {
   { "a",	"alias",	mail_alias,
 				"a[lias] [alias [address...]]" },

@@ -166,15 +166,19 @@ util_do_command (const char *cmd)
   int argc = 0;
   char **argv = NULL;
   int status = 0;
-  int (*command) (int, char**) = NULL;
+  Function *command;
 
   if (cmd[0] == '#')
     return 0;
 
-  if (util_get_argcv (cmd, &argc, &argv) != 0)
-    return util_free_argv (argc, argv);
-
-  command = util_command_get (argv[0]);
+  if (cmd)
+    {
+      if (util_get_argcv (cmd, &argc, &argv) != 0)
+	return util_free_argv (argc, argv);
+      command = util_command_get (argv[0]);
+    }
+  else
+    command = util_command_get ("quit");
 
   if (command != NULL)
     status = command (argc, argv);
@@ -218,23 +222,89 @@ util_msglist_command (int (*func)(int, char**), int argc, char **argv)
 /*
  * returns the function to run for command
  */
-int *
+Function *
 util_command_get (char *cmd)
 {
-  int i = 0;
+  struct mail_command_entry entry = util_find_entry (cmd);
+  return entry.func;
+}
+
+/*
+ * returns the mail_command_entry structure for the command matching cmd
+ */
+struct mail_command_entry
+util_find_entry (char *cmd)
+{
+  int i = 0, ll = 0, sl = 0;
   int len = strlen (cmd);
-  int sl, ll;
-  
+
   while (mail_command_table[i].shortname != 0)
     {
       sl = strlen (mail_command_table[i].shortname);
       ll = strlen (mail_command_table[i].longname);
       if (sl == len && !strcmp (mail_command_table[i].shortname, cmd))
-	return mail_command_table[i].func;
+	return mail_command_table[i];
       else if (sl < len && !strncmp (mail_command_table[i].longname, cmd, len))
-	return mail_command_table[i].func;
+	return mail_command_table[i];
       i++;
     }
+  return mail_command_table[i];
+}
+
+/*
+ * readline tab completion
+ */
+char **
+util_command_completion (char *cmd, int start, int end)
+{
+  if (start == 0)
+    return completion_matches (cmd, util_command_generator);
+  return NULL;
+}
 
+/*
+ * more readline
+ */
+char *
+util_command_generator (char *text, int state)
+{
+  static int i, len;
+  char *name;
+  
+  if (!state)
+    {
+      i = 0;
+      len = strlen (text);
+    }
+  
+  while ((name = mail_command_table[i].longname))
+    {
+      i++;
+      /*if (strlen (mail_command_table[i].shortname) > strlen(name))
+	name = mail_command_table[i].shortname; */
+      if (strncmp (name, text, len) == 0)
+	return (strdup(name));
+    }
+  
   return NULL;
 }
+
+/*
+ * removes whitespace from the beginning and end of a string
+ */
+char *
+util_stripwhite (char *string)
+{
+  register char *s, *t;
+  for (s = string; whitespace (*s); s++)
+    ;
+  if (*s == 0)
+    return s;
+  t = s + strlen (s) - 1;
+  while (t > s && whitespace (*t))
+    t--;
+  *++t = '\0';
+  return s;
+}
+
+