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/*
Copyright (c) 2024, Lance Borden
All rights reserved.
This software is licensed under the BSD 3-Clause License.
You may obtain a copy of the license at:
https://opensource.org/licenses/BSD-3-Clause
Redistribution and use in source and binary forms, with or without
modification, are permitted under the conditions stated in the BSD 3-Clause
License.
THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "lush.h"
#include <linux/limits.h>
#include <pwd.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MAX_LINES 512
static char *get_history_path() {
uid_t uid = getuid();
struct passwd *pw = getpwuid(uid);
if (!pw) {
perror("retrieve home dir");
return NULL;
}
size_t path_length = strlen(pw->pw_dir) + strlen("/.lush_history") + 1;
char *path = malloc(path_length);
if (!path) {
perror("malloc");
return NULL;
}
strcpy(path, pw->pw_dir);
strcat(path, "/.lush_history");
return path;
}
char *lush_get_past_command(int pos) {
char *path = get_history_path();
if (access(path, F_OK) != 0) {
// file does not exist
perror("history file check");
free(path);
return NULL;
}
// read file from the bottom
FILE *fp = fopen(path, "r");
if (!fp) {
perror("opening file");
free(path);
return NULL;
}
char *line = (char *)malloc(1024 * sizeof(char));
if (line == NULL) {
perror("malloc");
free(path);
return NULL;
}
int curr_line = 0;
while (fgets(line, 1024, fp)) {
if (curr_line == pos) {
fclose(fp);
return line;
}
curr_line++;
}
fclose(fp);
free(path);
return line;
}
void lush_push_history(const char *line) {
char *path = get_history_path();
// check if the file exists and create if not
if (access(path, F_OK) != 0) {
FILE *fp = fopen(path, "w");
if (fp == NULL) {
perror("creating file");
} else {
fclose(fp);
}
}
FILE *fp = fopen(path, "r");
if (fp == NULL) {
perror("opening file");
free(path);
return;
}
// Count lines
int line_count = 0;
char buffer[1024]; // Adjust buffer size as needed
while (fgets(buffer, sizeof(buffer), fp)) {
line_count++;
}
// Allocate memory for file content
fseek(fp, 0, SEEK_SET);
char **lines = (char **)malloc(line_count * sizeof(char *));
if (lines == NULL) {
perror("malloc");
fclose(fp);
free(path);
return;
}
// Read lines into memory
int index = 0;
while (fgets(buffer, sizeof(buffer), fp)) {
lines[index] = strdup(buffer); // Allocate and copy each line
if (lines[index] == NULL) {
perror("strdup");
while (index > 0)
free(lines[--index]);
free(lines);
free(path);
fclose(fp);
return;
}
index++;
}
fclose(fp);
// Open file for writing
fp = fopen(path, "w");
if (fp == NULL) {
perror("opening file");
for (int i = 0; i < index; i++)
free(lines[i]);
free(lines);
free(path);
return;
}
// Write the new line
fprintf(fp, "%s\n", line);
// Write the last MAX_LINES lines
int total_lines = line_count < MAX_LINES ? line_count : MAX_LINES;
for (int i = 0; i < total_lines; i++) {
fprintf(fp, "%s", lines[i]);
free(lines[i]); // Free each line after writing
}
// Clean up
free(lines);
free(path);
fclose(fp);
}
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