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/* 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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