Hi there APLers!

I found it too annoying that APL creates .apl.history file in whatever
is current directory and spams my filesystem, so I've patched it to
create this file in user's $HOME directory by default.  Maybe you'll
find it useful as well.

./danfe
--- gnu-apl.d/preferences.in.orig	2019-06-23 12:39:20 UTC
+++ gnu-apl.d/preferences.in
@@ -301,10 +301,11 @@
 # execution mode and ∇-edit mode.
 #
 # Below the number of history lines and the location of the history file 
-# can be configured.
+# can be configured. If the file path starts with "~/", tilde (~) would
+# be expanded to the value of the 'HOME' environment variable.
 #
 READLINE_HISTORY_LEN  500
-READLINE_HISTORY_PATH .apl.history
+READLINE_HISTORY_PATH ~/.apl.history
 
 # The history can serve two purposes: to recall lines that were previously
 # and to list what was done (with command )HISTORY). For the latter purpose
--- src/UserPreferences.cc.orig	2019-06-23 12:39:20 UTC
+++ src/UserPreferences.cc
@@ -1299,7 +1299,25 @@ int file_profile = 0;   // the current profile in the 
             }
          else if (!strcasecmp(opt, "READLINE_HISTORY_PATH"))
             {
-              line_history_path = UTF8_string(arg);
+              // If 'arg' starts with "~/", expand ~ -> $HOME
+              if (arg[0] == '~' && arg[1] == '/') 
+                 {
+                   const char * HOME = getenv("HOME");
+                   if (HOME == 0)
+                      {
+                        if (log_startup)
+                           CERR << "environment variable 'HOME' is not "
+                                   "defined for '~' expansion, will use "
+                                << (arg + 2) << endl;
+                        line_history_path = UTF8_string(arg + 2);
+                      }
+                   else
+                      {
+                        line_history_path = UTF8_string(HOME);
+                        line_history_path.append_ASCII(arg + 1);
+                      }
+                 }
+              else line_history_path = UTF8_string(arg);
             }
          else if (!strcasecmp(opt, "NABLA-TO-HISTORY"))
             {

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