From cbbc71bf7754af613cd7b4b695baeef5b51e1e07 Mon Sep 17 00:00:00 2001
From: David Walter Seikel
Date: Thu, 30 Jan 2014 19:12:04 +1000
Subject: Added dumbsh, a really really dumb shell, for demonstration.

Yes, I know, it's still broken.
---
 dumbsh.c | 220 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 220 insertions(+)
 create mode 100644 dumbsh.c

diff --git a/dumbsh.c b/dumbsh.c
new file mode 100644
index 0000000..1d4ca4f
--- /dev/null
+++ b/dumbsh.c
@@ -0,0 +1,220 @@
+/* dumbsh.c - A really dumb shell, to demonstrate handlekeys usage.
+ *
+ * Copyright 2014 David Seikel <won_fang@yahoo.com.au>
+ *
+ * Not a real shell, so doesn't follow any standards, 
+ * coz it wont implement them anyway.
+
+USE_DUMBSH(NEWTOY(dumbsh, "", TOYFLAG_USR|TOYFLAG_BIN))
+
+config DUMBSH
+  bool "dumbsh"
+  default n
+  help
+    usage: dumbsh
+
+    A really dumb shell.
+*/
+
+#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.dumbsh
+
+static void moveCursor()
+{
+  if (0 > TT.y)  TT.y = 0;
+  if (0 > TT.x)  TT.x = 0;
+  if (strlen(toybuf) <= TT.x)  TT.x = strlen(toybuf);
+  if (TT.w < TT.y)  TT.y = TT.w;
+  if (TT.h < TT.x)  TT.x = TT.h;
+  printf("\x1B[%d;0H%s\x1B[%d;%dH", TT.y + 1, toybuf, TT.y + 1, TT.x + 1);
+  fflush(stdout);
+}
+
+static void handleCSI(long extra, char *command, int *params, int count)
+{
+  // Parameters are cursor line and column.  Note this may be sent at other times, not just during terminal resize.
+  if (strcmp("R", command) == 0)
+  {
+    int r = params[0], c = params[1];
+
+    // The defaults are 1, which get ignored by the heuristic below.
+    // Check it's not an F3 key variation, coz some of them use the same CSI function code.
+    // This is a heuristic, we are checking against an unusable terminal size.
+    if ((2 == count) && (8 < r) && (8 < c))
+    {
+      TT.h = r;
+      TT.w = c;
+      moveCursor();
+    }
+  }
+}
+
+static void deleteChar()
+{
+  int j;
+
+  for (j = TT.x; toybuf[j]; j++)
+    toybuf[j] = toybuf[j + 1];
+  moveCursor();
+}
+
+static void backSpaceChar()
+{
+  if (TT.x)
+  {
+    TT.x--;
+    deleteChar();
+  }
+}
+
+static void doCommand()
+{
+  // This is where we would actually deal with what ever command the user had typed in.
+  // For now we just move on.
+  toybuf[0] = 0;
+  TT.x = 0;
+  TT.y++;
+  moveCursor();
+}
+
+static void downLine()
+{
+  // Do command history stuff here.
+}
+
+static void endOfLine()
+{
+  TT.x = strlen(toybuf) - 1;
+  moveCursor();
+}
+
+static void leftChar()
+{
+  TT.x--;
+  moveCursor();
+}
+
+static void quit()
+{
+  handle_keys_quit();
+}
+
+static void rightChar()
+{
+  TT.x++;
+  moveCursor();
+}
+
+static void startOfLine()
+{
+  TT.x = 0;
+  moveCursor();
+}
+
+static void upLine()
+{
+  // Do command history stuff here.
+}
+
+// The key to command mappings.
+static struct keyCommand simpleEmacsKeys[] =
+{
+  {"Del",	backSpaceChar},
+  {"^D",	deleteChar},
+  {"Return",	doCommand},
+  {"Down",	downLine},
+  {"^N",	downLine},
+  {"End",	endOfLine},
+  {"^E",	endOfLine},
+  {"Left",	leftChar},
+  {"^B",	leftChar},
+  {"^X^C",	quit},
+  {"^C",	quit},
+  {"Right",	rightChar},
+  {"^F",	rightChar},
+  {"Home",	startOfLine},
+  {"^A",	startOfLine},
+  {"Up",	upLine},
+  {"^P",	upLine},
+  {NULL, NULL}
+};
+
+static int handleKeySequence(long extra, char *sequence)
+{
+  int j;
+
+  // Search for a key sequence bound to a command.
+  for (j = 0; simpleEmacsKeys[j].key; j++)
+  {
+    if (strcmp(simpleEmacsKeys[j].key, sequence) == 0)
+    {
+      if (simpleEmacsKeys[j].handler)  simpleEmacsKeys[j].handler();
+      return 1;
+    }
+  }
+
+  if ((0 == sequence[1]) && isprint(sequence[0]))	// See if it's an ordinary key.
+  {
+    if (TT.x < sizeof(toybuf))
+    {
+      int j;
+
+      for (j = strlen(toybuf); j >= TT.x; j--)
+        toybuf[j + 1] = toybuf[j];
+      toybuf[TT.x] = sequence[0];
+      TT.x++;
+      moveCursor();
+    }
+    return 1;
+  }
+
+  return 0;
+}
+
+void dumbsh_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.
+  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);
+
+  TT.w = 80;
+  TT.h = 24;
+  terminal_size(&TT.w, &TT.h);
+
+  // Run the main loop.
+  handle_keys(0, handleKeySequence, handleCSI);
+
+  // Restore the old terminal settings.
+  tcsetattr(0, TCSANOW, &oldtermio);
+
+  puts("");
+  fflush(stdout);
+}
-- 
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