#include "esh_misc.h"

void EShOptimiseCurrentWorkingDirectory() {
	if (strstr(esh_info_global->current_working_dir, esh_info_global->user_data->pw_dir) == esh_info_global->current_working_dir) {
		char new_cwd[PATH_MAX + 1];
		memset(new_cwd, 0, PATH_MAX + 1);
		strcat(new_cwd, "~");
		strcat(new_cwd, esh_info_global->current_working_dir + strlen(esh_info_global->user_data->pw_dir));
		strcpy(esh_info_global->current_working_dir, new_cwd);
	}
}

void EShUpdateInviteMessage() {
	memset(esh_info_global->invite_message, 0, (esh_info_global->max_invite_message_len + 1) * sizeof(char));
	strcat(esh_info_global->invite_message, ANSI_COLOR_BLUE);
	strcat(esh_info_global->invite_message, esh_info_global->user_data->pw_name);
	strcat(esh_info_global->invite_message, ANSI_COLOR_RESET);
	strcat(esh_info_global->invite_message, "@");
	strcat(esh_info_global->invite_message, ANSI_COLOR_GREEN);
	strcat(esh_info_global->invite_message, esh_info_global->current_working_dir);
	strcat(esh_info_global->invite_message, ANSI_COLOR_RESET);
	strcat(esh_info_global->invite_message, " » ");
}

void EShShowHelpAndExit() {
	printf(ANSI_COLOR_RED "ESh (Endevir Shell) build %.8s\n" ANSI_COLOR_RESET
		   "\n"
		   "Usage: esh [-h] [-config FILENAME] [-history FILENAME] [-history_limit INT] [-max_active_jobs INT] [-max_command_length INT]\n"
		   "\n"
		   "Description:\n"
		   "This is a simple shell, written in C\n"
		   "\n"
		   "Parameters:\n"
		   "-h                          shows this message and exits\n"
		   "-config FILENAME            uses file with name FILENAME as config file (default: ~/.esh_conf)\n"
		   "-history_path FILENAME      uses file with name FILENAME as storage for entered commands history (default: ~/.esh_history)\n"
		   "-history_limit INT          limits commands number to keep up to INT (default: 5000 lines)\n"
		   "-max_active_jobs INT        limits shell active jobs number up to INT (default: 64)\n"
		   "-max_command_length INT     limits maximum length of single command up to INT (default: 1024 chars)\n"
		   "\n"
		   "\n"
		   "Copyleft. Written by Ivan Arkhipov aka Endevir (me@endevir.ru), MIPT, Dolgoprudny, Russia, 2019.\n",
		   esh_info_global->build_ref);

   	exit(0);
}

int EShIsShellLetter(char c) {
	return (c >= 'a' && c <= 'z') || 
		   (c >= 'A' && c <= 'Z') || 
		   (c >= 'а' && c <= 'я') || 
		   (c >= 'А' && c <= 'Я') || 
		   (c >= '0' && c <= '9') || 
		   (c >= ' ' && c <= '/') ||
		   (c >= ':' && c <= '?');
}