5 files changed, 36 insertions, 19 deletions

diff --git a/doc/nissy.1 b/doc/nissy.1
index 992745d..0e2e5cb 100644
--- a/doc/nissy.1
+++ b/doc/nissy.1
@@ -6,25 +6,34 @@
 .Nd a Rubik's cube solver and FMC assistant
 .
 .Sh SYNOPSIS
-.Nm
+.Nm Op Fl b
 .Nm
 .Ar command
 .Op options...
 .
-When run without any argument an interactive shell is launched, otherwise
-the provided
-.Ar command
-is executed and nissy terminates.
-The commands that can be run in the interactive shell are the same that can
-be run non-interactively and are provided below.
-.
 .Sh DESCRIPTION
 .Nm
 is a Rubik's Cube solver. Its optimal solver function uses Kociemba's one-step
 algorithm (huge optimal solver), and its performance is comparable to that
-of Kociemba's implementation in Cube Explorer.
+of Kociemba's implementation in Cube Explorer when using a single CPU
+thread, and much faster when using multiple threads.
 nissy can also solve different substeps of the Thistlethwaite's algorithm
 and more.
+.Pp
+When run without any argument an interactive shell is launched, otherwise
+the provided
+.Ar command
+is executed and nissy terminates. If the option
+.Fl b
+is given, every argument after it is ignored and the shell is launched without
+any prompt or welcome message. This can be used to run nissy in batch mode,
+for example writing a list of commands in a
+.Ar file
+(one per line) and running
+.Ar nissy -b < file
+.Pp
+The commands that can be run in the interactive shell are the same that can
+be run non-interactively and are provided below.
 .
 .Sh COMMANDS
 The available
diff --git a/nissy b/nissy
index 58bb540..4c759f5 100755
--- a/nissy
+++ b/nissy
diff --git a/nissy-2.0beta5.tar.gz b/nissy-2.0beta5.tar.gz
index 1fa13b3..78bb536 100644
--- a/nissy-2.0beta5.tar.gz
+++ b/nissy-2.0beta5.tar.gz
diff --git a/src/shell.c b/src/shell.c
index 8bc2e0b..f6f88d9 100644
--- a/src/shell.c
+++ b/src/shell.c
@@ -55,7 +55,7 @@ exec_args(int c, char **v)
 }
 
 void
-launch()
+launch(bool prompt)
 {
         int i, shell_argc;
         char line[MAXLINELEN], **shell_argv;
@@ -64,12 +64,15 @@ launch()
         for (i = 0; i < MAXNTOKENS; i++)
                 shell_argv[i] = malloc((MAXTOKENLEN+1) * sizeof(char));
 
-        fprintf(stderr, "Welcome to Nissy "VERSION".\n"
-                        "Type \"commands\" for a list of commands.\n"
-               );
+        if (prompt) {
+                fprintf(stderr, "Welcome to Nissy "VERSION".\n"
+                                "Type \"commands\" for a list of commands.\n");
+        }
 
         while (true) {
-                fprintf(stdout, "nissy-# ");
+                if (prompt) {
+                        fprintf(stdout, "nissy-# ");
+                }
                 if (fgets(line, MAXLINELEN, stdin) == NULL)
                         break;
                 shell_argc = parseline(line, shell_argv);
@@ -85,10 +88,15 @@ launch()
 int
 main(int argc, char *argv[])
 {
-        if (argc > 1)
-                exec_args(argc-1, &argv[1]);
-        else
-                launch();
+        if (argc > 1) {
+                if (!strcmp(argv[1], "-b")) {
+                        launch(false);
+                } else {
+                        exec_args(argc-1, &argv[1]);
+                }
+        } else {
+                launch(true);
+        }
 
         return 0;
 }
diff --git a/src/shell.h b/src/shell.h
index a72d136..bb85ba2 100644
--- a/src/shell.h
+++ b/src/shell.h
@@ -8,6 +8,6 @@
 #define MAXNTOKENS          255
 
 void        exec_args(int c, char **v);
-void        launch();
+void        launch(bool prompt);
 
 #endif