From edfd844dc7f8f503c5043bbd32235b201c331ee0 Mon Sep 17 00:00:00 2001
From: David Walter Seikel
Date: Thu, 10 Apr 2014 01:43:49 +1000
Subject: Add a showkey toy.  Not standard, I'll see if there's an actual
 standard later.

---
 showkey.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 showkey.c

diff --git a/showkey.c b/showkey.c
new file mode 100644
index 0000000..2f5947b
--- /dev/null
+++ b/showkey.c
@@ -0,0 +1,125 @@
+/* showkey.c - Shows the keys pressed.
+ *
+ * Copyright 2014 David Seikel <won_fang@yahoo.com.au>
+ *
+ * Dunno yet if this is a standard.
+
+USE_SHOWKEY(NEWTOY(showkey, "", TOYFLAG_USR|TOYFLAG_BIN))
+
+config SHOWKEY
+  bool "showkey"
+  default n
+  help
+    usage: showkey
+
+    Shows the keys pressed.
+*/
+
+#include "toys.h"
+#include "lib/handlekeys.h"
+
+typedef void (*eventHandler) (void);
+
+struct keyCommand
+{
+  char *key;
+  eventHandler handler;
+};
+
+GLOBALS(
+  unsigned h, w;
+  int x, y;
+)
+
+#define TT this.showkey
+
+
+// Callback for incoming CSI commands from the terminal.
+static void handleCSI(long extra, char *command, int *params, int count)
+{
+  int i;
+
+  // Is it a cursor location report?
+  if (strcmp("R", command) == 0)
+  {
+    printf("CSI cursor position - line %d, column %d\r\n", params[0], params[1]);
+    return;
+  }
+
+  printf("CSI command %s - ", command);
+  for (i = 0; i < count; i++)
+    printf("%d ", params[i]);
+  printf("\r\n");
+}
+
+static void quit()
+{
+  printf("Quitting.\r\n");
+  handle_keys_quit();
+}
+
+// The key to command mappings.
+static struct keyCommand simpleKeys[] =
+{
+  {"^C",	quit}
+};
+
+// Callback for incoming key sequences from the user.
+static int handleKeySequence(long extra, char *sequence, int isTranslated)
+{
+  int j, l = strlen(sequence);
+
+  if (isTranslated)
+    printf("TRANSLATED - ");
+  else
+    printf("KEY - ");
+  printf("%s\r\n", sequence);
+
+  // Search for a key sequence bound to a command.
+  for (j = 0; j < (sizeof(simpleKeys) / sizeof(*simpleKeys)); j++)
+  {
+    if (strncmp(simpleKeys[j].key, sequence, l) == 0)
+    {
+      // If it's a partial match, keep accumulating them.
+      if (strlen(simpleKeys[j].key) != l)
+        return 0;
+      else
+      {
+        if (simpleKeys[j].handler)  simpleKeys[j].handler();
+        return 1;
+      }
+    }
+  }
+
+  return 1;
+}
+
+void showkey_main(void)
+{
+  struct termios termIo, oldTermIo;
+
+  // Grab the old terminal settings and save it.
+  tcgetattr(0, &oldTermIo);
+  tcflush(0, TCIFLUSH);
+  termIo = oldTermIo;
+
+  // Mould the terminal to our will.
+  // In this example we are turning off all the terminal smarts, but real code
+  // might not want that.
+  termIo.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL
+                     | IUCLC | IXON | IXOFF | IXANY);
+  termIo.c_oflag &= ~OPOST;
+  termIo.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL | TOSTOP | ICANON | ISIG
+                     | IEXTEN);
+  termIo.c_cflag &= ~(CSIZE | PARENB);
+  termIo.c_cflag |= CS8;
+  termIo.c_cc[VTIME]=0;  // deciseconds.
+  termIo.c_cc[VMIN]=1;
+  tcsetattr(0, TCSANOW, &termIo);
+
+  handle_keys(0, handleKeySequence, handleCSI);
+
+  tcsetattr(0, TCSANOW, &oldTermIo);
+  puts("");
+  fflush(stdout);
+}
-- 
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