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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#if USE_READLINE
#include <readline/readline.h>
#include <readline/history.h>
#include <readline/tilde.h>
#else
#include <editline/readline.h>
#include <editline/history.h>
#endif
int history_loaded = 0;
char HISTORY_FILE[] = "~/.mal-history";
int load_history() {
if (history_loaded) { return 0; }
int ret;
char *hf = tilde_expand(HISTORY_FILE);
if (access(hf, F_OK) != -1) {
// TODO: check if file exists first, use non-static path
#if USE_READLINE
ret = read_history(hf);
#else
FILE *fp = fopen(hf, "r");
char *line = malloc(80); // getline reallocs as necessary
size_t sz = 80;
while ((ret = getline(&line, &sz, fp)) > 0) {
add_history(line); // Add line to in-memory history
}
free(line);
fclose(fp);
#endif
history_loaded = 1;
}
free(hf);
}
int append_to_history() {
char *hf = tilde_expand(HISTORY_FILE);
#ifdef USE_READLINE
append_history(1, hf);
#else
HIST_ENTRY *he = history_get(history_length-1);
FILE *fp = fopen(hf, "a");
fprintf(fp, "%s\n", he->line);
fclose(fp);
#endif
free(hf);
}
// line must be freed by caller
char *_readline (char prompt[]) {
char *line;
load_history();
line = readline(prompt);
if (!line) return NULL; // EOF
add_history(line); // Add input to in-memory history
append_to_history(); // Flush new line of history to disk
return line;
}
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