Load and save repl history.

* parser.c (repl): If a HOME environment variable
exists, then load the .txr_history file from the user's home
directory and save it when exiting.

* sysif.c (getenv_wrap): Static function changed to extern.

* sysif.h (getenv_wrap): Declared.

3 files changed, 16 insertions, 1 deletions

diff --git a/parser.c b/parser.c
index 532936f0..6b5a0593 100644
--- a/parser.c
+++ b/parser.c
@@ -48,6 +48,7 @@
 #include "eval.h"
 #include "stream.h"
 #include "y.tab.h"
+#include "sysif.h"
 #include "parser.h"
 #if HAVE_TERMIOS
 #include "linenoise/linenoise.h"
@@ -515,12 +516,18 @@ val repl(val bindings, val in_stream, val out_stream)
   val result_hash = make_hash(nil, nil, nil);
   val done = nil;
   val counter = one;
+  val home = getenv_wrap(lit("HOME"));
+  val histfile = if2(home, format(nil, lit("~a/.txr_history"), home, nao));
+  char *histfile_u8 = utf8_dup_to(c_str(histfile));
   val old_sig_handler = set_sig_handler(num(SIGINT), func_n2(repl_intr));
 
   reg_varl(result_hash_sym, result_hash);
 
   lino_set_completion_cb(ls, provide_completions, 0);
 
+  if (histfile)
+    lino_hist_load(ls, histfile_u8);
+
   while (!done) {
     val prompt = format(nil, lit("~a> "), counter, nao);
     val prev_counter = counter;
@@ -597,9 +604,16 @@ val repl(val bindings, val in_stream, val out_stream)
   }
 
   set_sig_handler(num(SIGINT), old_sig_handler);
+
+
+  if (histfile)
+    lino_hist_save(ls, histfile_u8);
+
+  free(histfile_u8);
   free(prompt_u8);
   free(line_u8);
   lino_free(ls);
+  gc_hint(histfile);
   return nil;
 }
 
diff --git a/sysif.c b/sysif.c
index 5197d337..1d858820 100644
--- a/sysif.c
+++ b/sysif.c
@@ -671,7 +671,7 @@ static val pipe_wrap(void)
 
 #endif
 
-static val getenv_wrap(val name)
+val getenv_wrap(val name)
 {
   char *nameu8 = utf8_dup_to(c_str(name));
   char *lookup = getenv(nameu8);
diff --git a/sysif.h b/sysif.h
index c54ddbad..b2b5ce2f 100644
--- a/sysif.h
+++ b/sysif.h
@@ -32,4 +32,5 @@ extern val dev_s, ino_s, mode_s, nlink_s, uid_s;
 extern val gid_s, rdev_s, size_s, blksize_s, blocks_s;
 extern val atime_s, mtime_s, ctime_s;
 
+val getenv_wrap(val name);
 void sysif_init(void);