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#define _GNU_SOURCE
#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>
#include "fzy.h"
#define INITIAL_CAPACITY 1
int choices_capacity = 0;
int choices_n = 0;
const char **choices = NULL;
double *choices_score = NULL;
size_t *choices_sorted = NULL;
size_t current_selection = 0;
void resize_choices(int new_capacity){
choices = realloc(choices, new_capacity * sizeof(const char *));
choices_score = realloc(choices_score, new_capacity * sizeof(double));
choices_sorted = realloc(choices_sorted, new_capacity * sizeof(size_t));
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);
}
size_t choices_available = 0;
static int cmpchoice(const void *p1, const void *p2) {
size_t idx1 = *(size_t *)p1;
size_t idx2 = *(size_t *)p2;
double score1 = choices_score[idx1];
double score2 = choices_score[idx2];
if(score1 == score2)
/* break ties by length of result */
return strlen(choices[idx1]) - strlen(choices[idx2]);
else if(score1 < score2)
return 1;
else
return -1;
}
void run_search(char *needle){
current_selection = 0;
choices_available = 0;
int i;
for(i = 0; i < choices_n; i++){
if(has_match(needle, choices[i])){
choices_score[i] = match(needle, choices[i]);
choices_sorted[choices_available++] = i;
}
}
qsort(choices_sorted, choices_available, sizeof(size_t), cmpchoice);
}
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_match(const char *choice, int selected){
int n = strlen(search);
size_t positions[n + 1];
for(int i = 0; i < n + 1; i++)
positions[i] = -1;
match_positions(search, choice, &positions[0]);
for(size_t i = 0, p = 0; choice[i] != '\0'; i++){
if(positions[p] == i){
fprintf(ttyout, "%c%c33m", 0x1b, '[');
p++;
}else{
fprintf(ttyout, "%c%c39;49m", 0x1b, '[');
}
fprintf(ttyout, "%c", choice[i]);
}
fprintf(ttyout, "\n");
fprintf(ttyout, "%c%c0m", 0x1b, '[');
}
void draw(){
int line = 0;
const char *prompt = "> ";
clear();
fprintf(ttyout, "%s%s\n", prompt, search);
for(size_t i = 0; line < 10 && i < choices_available; i++){
if(i == current_selection)
fprintf(ttyout, "%c%c7m", 0x1b, '[');
draw_match(choices[choices_sorted[i]], i == current_selection);
line++;
}
fprintf(ttyout, "%c%c%iA", 0x1b, '[', line + 1);
fprintf(ttyout, "%c%c%ziG", 0x1b, '[', strlen(prompt) + strlen(search) + 1);
fflush(ttyout);
}
void emit(){
/* ttyout should be flushed before outputting on stdout */
fclose(ttyout);
if(choices_available){
/* output the selected result */
printf("%s\n", choices[choices_sorted[current_selection]]);
}else{
/* No match, output the query instead */
printf("%s\n", search);
}
exit(EXIT_SUCCESS);
}
void run(){
run_search(search);
char ch;
do {
draw();
ch = ttygetchar();
if(isprint(ch)){
/* FIXME: overflow */
search[search_size++] = ch;
search[search_size] = '\0';
run_search(search);
}else if(ch == 127 || ch == 8){ /* DEL || backspace */
if(search_size)
search[--search_size] = '\0';
run_search(search);
}else if(ch == 21){ /* C-U */
search_size = 0;
search[0] = '\0';
}else if(ch == 23){ /* C-W */
if(search_size)
search[--search_size] = '\0';
while(search_size && !isspace(search[--search_size]))
search[search_size] = '\0';
run_search(search);
}else if(ch == 14){ /* C-N */
current_selection = (current_selection + 1) % 10;
draw();
}else if(ch == 16){ /* C-P */
current_selection = (current_selection + 9) % 10;
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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