Initial import of the code into gitv0.1

1 files changed, 94 insertions, 0 deletions

diff --git a/lib/autocomplete.c b/lib/autocomplete.c
new file mode 100644
index 0000000..12a8cdc
--- /dev/null
+++ b/lib/autocomplete.c
@@ -0,0 +1,94 @@
+/* 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;
+}