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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>
/* from match.c */
double match(const char *needle, const char *haystack);
#define INITIAL_CAPACITY 1
int choices_capacity = 0;
int choices_n = 0;
const char **choices = NULL;
void resize_choices(int new_capacity){
choices = realloc(choices, new_capacity * sizeof(const char *));
int i = choices_capacity;
for(; i < new_capacity; i++){
choices[i] = NULL;
}
choices_capacity = new_capacity;
}
void add_choice(const char *choice){
if(choices_n == choices_capacity){
resize_choices(choices_capacity * 2);
}
choices[choices_n++] = choice;
}
void read_choices(){
char *line = NULL;
size_t len = 0;
ssize_t read;
while ((read = getline(&line, &len, stdin)) != -1) {
char *nl;
if((nl = strchr(line, '\n')))
*nl = '\0';
add_choice(line);
line = NULL;
}
free(line);
}
void run_search(char *needle){
int i;
for(i = 0; i < choices_n; i++){
double rank = match(needle, choices[i]);
if(rank > 0){
printf("%s\n", choices[i]);
}
}
}
int ttyin;
FILE *ttyout;
struct termios original_termios;
void reset_tty(){
tcsetattr(ttyin, TCSANOW, &original_termios);
}
void init_tty(){
ttyin = open("/dev/tty", O_RDONLY);
ttyout = fopen("/dev/tty", "w");
tcgetattr(ttyin, &original_termios);
struct termios new_termios = original_termios;
new_termios.c_lflag &= ~(ICANON | ECHO);
tcsetattr(ttyin, TCSANOW, &new_termios);
}
char ttygetchar(){
char ch;
int size = read(ttyin, &ch, 1);
if(size < 0){
perror("error reading from tty");
exit(EXIT_FAILURE);
}else if(size == 0){
/* EOF */
exit(EXIT_FAILURE);
}else{
return ch;
}
}
int search_size;
char search[4096] = {0};
void clear(){
fprintf(ttyout, "%c%c0G", 0x1b, '[');
int line = 0;
while(line++ < 10 + 1){
fprintf(ttyout, "%c%cK\n", 0x1b, '[');
}
fprintf(ttyout, "%c%c%iA", 0x1b, '[', line-1);
fprintf(ttyout, "%c%c0G", 0x1b, '[');
}
void draw(){
int line = 0;
int i;
const char *prompt = "> ";
clear();
fprintf(ttyout, "%s%s\n", prompt, search);
for(i = 0; line < 10 && i < choices_n; i++){
double rank = match(search, choices[i]);
if(rank > 0){
fprintf(ttyout, "%s\n", choices[i]);
line++;
}
}
fprintf(ttyout, "%c%c%iA", 0x1b, '[', line + 1);
fprintf(ttyout, "%c%c%iG", 0x1b, '[', strlen(prompt) + strlen(search) + 1);
fflush(ttyout);
}
void emit(){
/* ttyout should be flushed before outputting on stdout */
fclose(ttyout);
int i;
for(i = 0; i < choices_n; i++){
double rank = match(search, choices[i]);
if(rank > 0){
/* Output the first match */
printf("%s\n", choices[i]);
exit(EXIT_SUCCESS);
}
}
/* No match, output the query instead */
printf("%s\n", search);
exit(EXIT_SUCCESS);
}
void run(){
draw();
char ch;
do {
ch = ttygetchar();
if(isprint(ch)){
/* FIXME: overflow */
search[search_size++] = ch;
search[search_size] = '\0';
draw();
}else if(ch == 127){ /* DEL */
if(search_size)
search[--search_size] = '\0';
draw();
}else if(ch == 23){ /* C-W */
if(search_size)
search[--search_size] = '\0';
while(search_size && !isspace(search[--search_size]))
search[search_size] = '\0';
draw();
}else if(ch == 10){ /* Enter */
clear();
emit();
}else{
printf("'%c' (%i)\n", ch, ch);
}
}while(1);
}
void usage(const char *argv0){
fprintf(stderr, "USAGE: %s\n", argv0);
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[]){
if(argc != 1){
usage(argv[0]);
}
atexit(reset_tty);
init_tty(reset_tty);
resize_choices(INITIAL_CAPACITY);
read_choices();
clear();
run();
return 0;
}
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