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/*
Copyright (C) 2006 by Jonas Kramer
Published under the terms of the GNU General Public License (GPL).
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <termios.h>
#include <assert.h>
#include "readline.h"
#include "interface.h"
static void delete(unsigned);
char * readline(struct prompt * setup) {
int eoln = 0, seq = 0, histsize = 0, index = -1, changed = !0;
static char line[1024];
unsigned length = 0;
assert(setup != NULL);
/* Print prompt if present. */
if(setup->prompt)
fputs(setup->prompt, stderr);
/* Initialize line (empty or with preset text if given). */
memset(line, 0, sizeof(line));
if(setup->line) {
strncpy(line, setup->line, sizeof(line) - 1);
length = strlen(line);
fputs(line, stderr);
}
/* Count items in history. */
for(histsize = 0; setup->history && setup->history[histsize]; ++histsize);
index = histsize;
canon(0);
while(!eoln) {
int key = fgetc(stdin);
switch(key) {
case 8: /* Backspace. */
case 127: /* Delete. */
/* We don't support moving the cursor from the end of the line
* so handle these the same. */
if(length > 0) {
delete(1);
line[--length] = 0;
changed = !0;
}
break;
case 9: /* Tab. */
/* Call the callback function for completion if present. */
if(setup->callback != NULL) {
if(setup->callback(line, sizeof(line), changed)) {
delete(length);
length = strlen(line);
memset(line + length, 0, sizeof(line) - length);
fprintf(stderr, "\r%s%s", setup->prompt, line);
}
changed = 0;
}
break;
case 4: /* EOF (^D) */
case 10: /* Line break. */
case 13: /* Carriage return (who knows...) */
eoln = !0;
break;
case 23: /* ^W */
if(length > 0) {
int alpha = isalpha(line[length - 1]);
while(length > 0 && isalpha(line[length - 1]) == alpha) {
line[--length] = 0;
delete(1);
}
changed = !0;
}
break;
case 27: /* Escape. */
++seq;
changed = !0;
break;
default:
changed = !0;
if(seq > 0) {
if(seq < 2)
++seq;
else {
seq = 0;
switch(key) {
case 65: /* Up. */
case 66: /* Down. */
if(histsize) {
if(key == 66 && index < histsize - 1)
++index;
if(key == 65 && index > -1)
--index;
delete(length);
memset(line, 0, length);
length = 0;
if(index > -1 && index < histsize) {
strncpy(
line,
setup->history[index],
sizeof(line) - 1
);
length = strlen(line);
fputs(line, stderr);
}
}
break;
}
}
}
else {
if(length < sizeof(line)) {
line[length++] = key;
fputc(key, stderr);
}
}
}
}
canon(!0);
fputc(10, stderr);
return line;
}
void canon(int enable) {
struct termios term;
tcgetattr(fileno(stdin), & term);
term.c_lflag = enable
? term.c_lflag | ICANON | ECHO
: term.c_lflag & ~(ICANON | ECHO);
tcsetattr(fileno(stdin), TCSANOW, & term);
}
static void delete(unsigned n) {
while(n--)
fputs("\b \b", stderr);
}
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