424 lines
14 KiB
C
424 lines
14 KiB
C
/* ask - a simple command line asker
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* Copyright 2019 Bruce Hill
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* Released under the MIT License (see LICENSE for details)
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* Usage: ask [-Q|--quickpick] [-y|--yes] [-n|--no] [-p|--password]
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* [-v|--version] [-h|--help] [-q |--query=initial] [[--prompt=]prompt [options...]]
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* --password: password mode
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* --quickpick: quickpick mode (exit when only one option remains)
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* --version: print version and exit
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* --help: print usage and exit
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* --query: initial value to pre-populate user input
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* --prompt: use the given prompt (displayed in bold)
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* --yes: append "[Y/n]" to the prompt, use quickpick mode,
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*/
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <termios.h>
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#include <unistd.h>
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#include "bterm.h"
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#define ASK_VERSION "0.2"
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#define LOWERCASE(c) ('A' <= (c) && (c) <= 'Z' ? ((c) + 'a' - 'A') : (c))
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#define EQ(a, b) (case_sensitive ? (a) == (b) : LOWERCASE(a) == LOWERCASE(b))
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#define PASSWORD "-\\|/"
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static int password = 0, quickpick = 0, case_sensitive = 0;
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static inline void *memcheck(void *p)
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{
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if (!p) {
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fprintf(stderr, "Memory allocation failure\n");
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exit(1);
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}
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return p;
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}
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/* Return length of the longest substring of patt[p:] that occurs within
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* str[s:], while still leaving enough space for the rest of `patt` to occur
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* within the rest of `str`. If there is no valid solution, return -1.
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*/
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static int lcs(const char *str, const char *patt, int slen, int plen, int s, int p, int *cache)
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{
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if (!patt[p]) return 0;
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if (!str[s]) return -1;
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if (cache[s*plen + p]) return cache[s*plen + p];
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if (!EQ(str[s], patt[p])) return lcs(str, patt, slen, plen, s+1, p, cache);
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// Run starting here
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int run = 1;
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while (str[s+run] && patt[p+run] && EQ(str[s+run], patt[p+run])
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&& lcs(str, patt, slen, plen, s+run, p+run, cache) >= 0) {
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++run;
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}
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if (run == 0) run = -1;
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cache[s*plen + p] = run;
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return run;
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}
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static int matches(const char *str, const char *patt)
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{
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while (*patt) {
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while (!EQ(*str, *patt)) {
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if (!*str) return 0;
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++str;
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}
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++str;
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++patt;
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}
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return 1;
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}
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static int fputc_escaped(char c, FILE *out)
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{
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static const char *escapes = " abtnvfr e";
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if (c > 0 && c <= '\x1b' && escapes[(int)c] != ' ') { // "\n", etc.
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fprintf(out, "\033[35m\\%c\033[37m", escapes[(int)c]);
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return 2;
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} else if (c >= 0 && !(' ' <= c && c <= '~')) { // "\x02", etc.
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fprintf(out, "\033[35m\\x%02X\033[37m", c);
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return 4;
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} else {
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fputc(c, out);
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return 1;
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}
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}
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static int draw_line(FILE *out, const char *line, const char *patt, int cursor)
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{
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size_t linelen = strlen(line), patlen = strlen(patt);
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int dim = 0;
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int p = 0;
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int run = 0;
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int *cache = calloc((linelen+1)*(patlen+1), sizeof(int));
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int backtrack = 0;
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int to_start = 0;
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for (int i = 0; i < (int)linelen; i++) {
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if (EQ(patt[p], line[i]) &&
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run + lcs(line,patt,(int)linelen,(int)patlen,i,p,cache)
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>= lcs(line,patt,(int)linelen,(int)patlen,i+1,p,cache)) {
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if (dim) {
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fputs("\033[22;1m", out);
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dim = 0;
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}
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int len = fputc_escaped(line[i], out);
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if (p >= cursor) backtrack += len;
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else to_start += len;
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++run;
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++p;
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} else {
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run = 0;
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if (!dim) {
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fputs("\033[22;2m", out);
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dim = 1;
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}
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int len = fputc_escaped(line[i], out);
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if (p >= cursor) backtrack += len;
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else to_start += len;
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}
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}
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if (backtrack) fprintf(out, "\033[0m\033[%dD", backtrack);
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free(cache);
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return to_start;
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}
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/*
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* A basic fuzzy matcher and line inputter
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*/
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static char *get_input(FILE *in, FILE *out, const char *prompt, const char *initial, int nopts, char **opts)
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{
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fprintf(out, "\033[K\033[0;1m%s\033[0m", prompt);
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size_t cap = initial ? strlen(initial) + 100 : 100;
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char *buf = memcheck(calloc(cap, 1));
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char *picked = NULL;
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int b = 0, len = 0;
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if (initial) {
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strcpy(buf, initial);
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len = (int)strlen(initial);
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b = len;
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}
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int start = 0, backtrack = 0;
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while (1) {
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case_sensitive = 0;
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for (const char *p = buf; *p; ++p)
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case_sensitive |= ('A' <= *p && *p <= 'Z');
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int ncandidates = 0;
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picked = NULL;
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if (buf[0]) {
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for (int i = 0; i < nopts; i++) {
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int j = (start + i) % nopts;
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if (matches(opts[j], buf)) {
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++ncandidates;
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if (!picked) {
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picked = opts[j];
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start = j;
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}
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}
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}
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}
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if (quickpick && ncandidates == 1 && picked)
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goto finished;
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if (backtrack) fprintf(out, "\033[%dD", backtrack);
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fputs("\033[K", out);
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if (password) {
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if (picked) fputs("\033[0;32m", out);
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else if (nopts > 0) fputs("\033[0;31m", out);
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else fputs("\033[0;2m", out);
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fputc((PASSWORD)[strlen(buf) % strlen(PASSWORD)], out);
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fputs("\033[0m", out);
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backtrack = 1;
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} else {
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if (picked) {
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backtrack = draw_line(out, picked, buf, b);
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} else {
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backtrack = draw_line(out, buf, buf, b);
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}
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}
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fflush(out);
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int key;
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skip_redraw:
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key = bgetkey(in, NULL, NULL, -1);
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switch (key) {
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case -1: case -2: case -3: goto skip_redraw;
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case '\r':
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goto finished;
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case KEY_CTRL_C: case KEY_ESC:
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free(buf);
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buf = NULL;
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picked = NULL;
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goto finished;
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case KEY_CTRL_A:
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b = 0;
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break;
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case KEY_CTRL_E:
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b = len;
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break;
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case KEY_CTRL_U: {
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int to_clear = b;
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if (to_clear) {
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memmove(buf, buf+b, (size_t)(len-b));
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buf[len -= b] = 0;
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b = 0;
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}
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break;
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}
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case KEY_CTRL_K:
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if (b < len)
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buf[len = b] = 0;
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break;
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case KEY_CTRL_N:
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if (picked) {
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for (int i = 1; i < nopts; i++) {
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int j = (start + i) % nopts;
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if (matches(opts[j], buf)) {
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start = j;
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break;
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}
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}
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}
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break;
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case KEY_CTRL_P:
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if (picked) {
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for (int i = nopts-1; i > 0; i--) {
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int j = (start + i) % nopts;
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if (matches(opts[j], buf)) {
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start = j;
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break;
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}
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}
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}
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break;
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case KEY_BACKSPACE: case KEY_BACKSPACE2:
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if (b > 0) {
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--b;
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memmove(buf+b, buf+b+1, (size_t)(len-b));
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buf[--len] = 0;
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}
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break;
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case KEY_DELETE: case KEY_CTRL_D:
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if (b < len) {
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memmove(buf+b, buf+b+1, (size_t)(len-b));
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buf[--len] = 0;
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}
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break;
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case KEY_ARROW_LEFT: case KEY_CTRL_B:
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if (b > 0) --b;
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break;
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case KEY_ARROW_RIGHT: case KEY_CTRL_F:
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if (b < len) ++b;
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break;
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case KEY_CTRL_Q: case KEY_CTRL_V: {
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int nextkey;
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while ((nextkey = bgetkey(in, NULL, NULL, -1)) < 0)
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;
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if (len + 1 >= (int)cap)
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buf = memcheck(realloc(buf, (cap += 100)));
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if (b < len)
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memmove(buf+b+1, buf+b, (size_t)(len-b+1));
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buf[b++] = (char)nextkey;
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buf[++len] = 0;
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break;
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}
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case KEY_CTRL_T: {
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if (len < 2 || b == 0) break;
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if (b < len)
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b++;
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char tmp = buf[b-1];
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buf[b-1] = buf[b-2];
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buf[b-2] = tmp;
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break;
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}
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default:
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if ((' ' <= key && key <= '~') || key == '\t') {
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if (len + 1 >= (int)cap)
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buf = memcheck(realloc(buf, (cap += 100)));
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if (b < len)
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memmove(buf+b+1, buf+b, (size_t)(len-b+1));
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buf[b++] = (char)key;
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buf[++len] = 0;
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}
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break;
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}
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}
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finished:
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if (picked) picked = memcheck(strdup(picked));
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else picked = buf;
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if (backtrack || prompt[0])
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fprintf(out, "\033[%dD", backtrack + (int)strlen(prompt));
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fputs("\033[0m\033[K", out);
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if (picked != buf && buf) free(buf);
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return picked;
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}
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int main(int argc, char *argv[])
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{
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int yes = 0, no = 0;
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char *prompt = NULL, *query = NULL;
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char **opts = NULL;
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size_t linescap = 0, linecap = 0;
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int nopts = 0;
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char *line = NULL;
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struct pollfd pfd = {STDIN_FILENO, POLLIN, 0};
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if (poll(&pfd, 1, 50) > 0) {
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while ((getline(&line, &linecap, stdin)) >= 0) {
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if ((size_t)nopts >= linescap)
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opts = memcheck(realloc(opts, (linescap += 100)*sizeof(char*)));
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if (!line[0]) continue;
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if (line[strlen(line)-1] == '\n')
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line[strlen(line)-1] = '\0';
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opts[nopts++] = memcheck(strdup(line));
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}
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}
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int a = 1;
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while (a < argc) {
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if (argv[a][0] == '-' && argv[a][1] != '-') {
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for (char *p = &argv[a][1]; *p; p++) {
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switch (*p) {
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case 'P': password = 1; break;
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case 'q': quickpick = 1; break;
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case 'h': goto help_flag;
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case 'v': goto version_flag;
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case 'y': yes = 1; quickpick = 1; break;
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case 'n': no = 1; quickpick = 1; break;
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}
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}
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} else if (strcmp(argv[a], "-p") == 0) {
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prompt = argv[++a];
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} else if (strcmp(argv[a], "-q") == 0) {
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query = argv[++a];
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} else if (strncmp(argv[a], "--prompt=", strlen("--prompt=")) == 0) {
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prompt = &argv[a][strlen("--prompt=")];
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} else if (strncmp(argv[a], "--query=", strlen("--query=")) == 0) {
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query = &argv[a][strlen("--query=")];
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} else if (strcmp(argv[a], "--password") == 0) {
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password = 1;
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} else if (strcmp(argv[a], "--quickpick") == 0) {
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quickpick = 1;
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} else if (strcmp(argv[a], "--yes") == 0) {
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yes = 1;
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quickpick = 1;
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} else if (strcmp(argv[a], "--no") == 0) {
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no = 1;
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quickpick = 1;
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} else if (strcmp(argv[a], "--help") == 0) {
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help_flag:
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printf("ask - A simple command line input tool.\n"
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"Usage: ask [-Q|--quickpick] [-P|--password] [-v|--version] [-h|--help] "
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"[-y|--yes] [-n|--no] [-q |--query=query] [[-p |--prompt=]prompt [options...]]\n");
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return 0;
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} else if (strcmp(argv[a], "--version") == 0) {
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version_flag:
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printf("ask %s\n", ASK_VERSION);
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return 0;
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} else break;
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++a;
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}
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if (!prompt && a < argc) prompt = argv[a++];
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while (a < argc) {
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if ((size_t)nopts >= linescap)
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opts = memcheck(realloc(opts, (linescap += 100)*sizeof(char*)));
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opts[nopts++] = argv[a++];
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}
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if (yes || no) {
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if ((size_t)nopts + 4 >= linescap)
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opts = memcheck(realloc(opts, (linescap += 4)*sizeof(char*)));
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opts[nopts++] = "y";
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opts[nopts++] = "n";
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opts[nopts++] = "Y";
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opts[nopts++] = "N";
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}
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if (yes) {
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char *p2 = memcheck(calloc((prompt ? strlen(prompt) : 0)+5+1, sizeof(char)));
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if (prompt) strcpy(p2, prompt);
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strcat(p2, "[Y/n]");
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prompt = p2;
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} else if (no) {
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char *p2 = memcheck(calloc((prompt ? strlen(prompt) : 0)+5+1, sizeof(char)));
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if (prompt) strcpy(p2, prompt);
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strcat(p2, "[y/N]");
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prompt = p2;
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}
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if (!prompt) prompt = "> ";
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FILE *tty_in = fopen("/dev/tty", "r");
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FILE *tty_out = fopen("/dev/tty", "w");
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struct termios orig_termios, bb_termios;
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tcgetattr(fileno(tty_out), &orig_termios);
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cfmakeraw(&bb_termios);
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if (tcsetattr(fileno(tty_out), TCSAFLUSH, &bb_termios) == -1)
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return 1;
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char *output = get_input(tty_in, tty_out, prompt, query, nopts, opts);
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fflush(tty_out);
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tcsetattr(fileno(tty_out), TCSAFLUSH, &orig_termios);
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fclose(tty_out);
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tty_out = NULL;
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fclose(tty_in);
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tty_in = NULL;
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// This doesn't free memory, but it doesn't need to because
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// the program is exiting
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if (!output) return 1;
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fputs(output, stdout);
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if (yes)
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return strcmp(output, "n") == 0 && strcmp(output, "N") == 0;
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if (no)
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return strcmp(output, "y") != 0 && strcmp(output, "Y") != 0;
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return 0;
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}
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// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1
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