Russ posted two script called " and "" time ago on this list,
IIRC.
On Fri, Jan 23, 2009 at 11:03 AM, pavel.klinkov...@gmail.com
<pavel.klinkov...@gmail.com> wrote:
> Hi all,
>
> In Plan9 I missed the simple way to repeat previous (or previous of
> previous etc.) command in the terminal.
> I prepared a very small (an stupid) program to allow that.
>
> Compile the following source code and run it in that way:
> 8.out | rc -i
>
> You can insert the commands, and if you want to walk through the
> "history", just press CTRL+K (backward) or CTRL+L (foreward).
>
> That is all, folks. ;-)
>
> Pavel
>
>
> #include <u.h>
> #include <libc.h>
>
> enum
> {
> KCtrlD = 0x04,
> KCtrlK = 0x0B,
> KCtrlL = 0x0C,
> KDelete = 0x7F,
>
> MaxLen = 128,
> MaxDepth = 10
> };
>
> struct Line
> {
> int len;
> char buf[MaxLen];
> };
> typedef struct Line Line;
>
> void
> main(void)
> {
> // Console control file descriptor
> int cfd;
> // End flag
> int end = 0;
> // Actual read character
> char c;
> // Array of BackSpaces
> char bs[MaxLen];
> // Array of Lines
> Line line[MaxDepth];
> // Index of actual line
> int act = 0;
> // Index of stored line
> int stored = 0;
>
> memset(bs, '\b', sizeof(bs));
> memset(line, 0, sizeof(line));
>
> cfd = open("/dev/consctl", OWRITE);
> if (cfd < 0)
> sysfatal("%r");
> write(cfd, "rawon", 5);
>
> while (!end) {
> if (read(0, &c, sizeof(c)) < 0)
> sysfatal("%r");
>
> switch (c) {
> case KCtrlD:
> case KDelete:
> end++;
> break;
>
> case '\b':
> if (line[act].len > 0) {
> line[act].len--;
> write(2, &c, sizeof(c));
> }
> break;
>
> case '\n':
> if (line[act].len > 0)
> write(1, line[act].buf, line[act].len);
> write(1, &c, sizeof(c));
> write(2, &c, sizeof(c));
> act = stored = (act + 1) % MaxDepth;
> line[act].len = 0;
> break;
>
> case KCtrlK:
> write(2, bs, line[act].len);
> stored = (stored + MaxDepth - 1) % MaxDepth;
> line[act] = line[stored];
> write(2, line[act].buf, line[act].len);
> break;
>
> case KCtrlL:
> write(2, bs, line[act].len);
> stored = (stored + 1) % MaxDepth;
> line[act] = line[stored];
> write(2, line[act].buf, line[act].len);
> break;
>
> case -0x11:
> read(0, &c, sizeof(c));
> read(0, &c, sizeof(c));
> break;
>
> default:
> if (line[act].len < MaxLen) {
> line[act].buf[line[act].len++] = c;
> write(2, &c, sizeof(c));
> }
> break;
> }
> }
>
> close(cfd);
>
> exits(nil);
> }
>
>
