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/* Aplwc - A Programming Language With Constraints
*
* Copyright (C) 2026 Peter Mikkelsen <petermikkelsen10@gmail.com>
*
* This file is part of aplwc.
*
* Aplwc is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Aplwc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with aplwc. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <aplwc.h>
#include "aplwc_internal.h"
struct completion_state {
const struct aplwc *aplwc;
int num;
const char *word;
const int wordlen;
};
static char **generate(struct aplwc *, const char *, char *(*)(struct completion_state *));
static char *completions_syscmd(struct completion_state *);
char **
aplwc_autocomplete(struct aplwc *aplwc, const char *line, int start, int end)
{
int len = end-start;
char *word = malloc(sizeof(char) * len+1);
char **completions = NULL;
memcpy(word, line+start, len);
word[len] = 0;
if(start == 0 && word[0] == ')')
completions = generate(aplwc, word, completions_syscmd);
free(word);
return completions;
}
static char **
generate(struct aplwc *aplwc, const char *word, char *(*fn)(struct completion_state *))
{
char **completions = NULL;
struct completion_state state = {
.aplwc = aplwc,
.num = 0,
.word = word,
.wordlen = strlen(word),
};
char *c;
int index = 0;
while(c = fn(&state)){
index++;
completions = realloc(completions, sizeof(*completions) * (index + 1));
completions[index-1] = c;
completions[index] = NULL;
}
return completions;
}
static char *
completions_syscmd(struct completion_state *state)
{
struct aplwc_syscmd *syscmd;
while(syscmd = state->aplwc->syscmds[state->num++]){
const char *name = syscmd->name;
if(strncmp(name, state->word+1, state->wordlen-1) == 0){
int len = strlen(name);
char *result = malloc(sizeof(char) * (len + 2));
result[0] = ')';
memcpy(result+1, name, sizeof(char) * (len+1));
return result;
}
}
return NULL;
}
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