/// parses the command string
void parse(teasafe::TeaSafe &theBfs, std::string const &commandStr, std::string &workingDir)
{
std::vector<std::string> comTokens;
boost::algorithm::split_regex(comTokens, commandStr, boost::regex("\\s+"));
if (comTokens[0] == "ls") {
if (comTokens.size() > 1) {
com_ls(theBfs, formattedPath(workingDir, comTokens[1]));
}
com_ls(theBfs, workingDir);
} else if (comTokens[0] == "pwd") {
std::cout<<workingDir<<std::endl;
} else if (comTokens[0] == "rm") {
if (comTokens.size() < 2) {
std::cout<<"Error: please specify /path"<<std::endl;
} else {
com_rm(theBfs, formattedPath(workingDir, comTokens[1]));
}
} else if (comTokens[0] == "mkdir") {
if (comTokens.size() < 2) {
std::cout<<"Error: please specify /path"<<std::endl;
} else {
com_mkdir(theBfs, formattedPath(workingDir, comTokens[1]));
}
} else if (comTokens[0] == "add") {
if (comTokens.size() < 2) {
std::cout<<"Error: please specify file:///path"<<std::endl;
} else {
com_add(theBfs, workingDir, comTokens[1]);
}
} else if (comTokens[0] == "push") {
if (comTokens.size() < 2) {
std::cout<<"Error: please specify /path"<<std::endl;
} else {
com_push(theBfs, workingDir, comTokens[1]);
}
} else if (comTokens[0] == "pop") {
com_pop(theBfs, workingDir);
} else if (comTokens[0] == "cd") {
if (comTokens.size() < 2) {
std::cout<<"Error: please specify path"<<std::endl;
} else {
com_cd(theBfs, workingDir, formattedPath(workingDir, comTokens[1]));
}
} else if (comTokens[0] == "extract") {
if (comTokens.size() < 3) {
std::cout<<"Error: please specify /src/path and file:///dst/parent/path/"<<std::endl;
} else {
com_extract(theBfs, formattedPath(workingDir, comTokens[1]), comTokens[2]);
}
} else if (comTokens[0] == "help") {
com_help();
} else if (comTokens[0] == "quit") {
exit(0);
} else if (comTokens[0] == "exit") {
exit(0);
}
}
/// handles tab-key; attempts to provide rudimentary tab-completion
void handleTabKey(teasafe::TeaSafe &theBfs,
std::string const &workingPath,
int &cursorPos,
std::string &toReturn)
{
// get the token from the string that we're tring to tab-complete
std::cout<<"\n";
std::vector<std::string> comTokens;
boost::algorithm::split_regex(comTokens, toReturn, boost::regex("\\s+"));
// if the user hasn't entered anything, simply list the available commands
if(toReturn.empty()) {
com_help();
std::cout<<"ts$> "<<toReturn;
return;
}
// else process which bit to tab-complete
std::string tabCompleted;
size_t len;
if(comTokens.size() > 1) {
auto toBeCompleted(comTokens[comTokens.size()-1]);
// make sure the working path is correctly formatted
auto wd(workingPath);
// if relative then append a slash to working path
if(*toBeCompleted.begin() != '/') {
// only append path seperator if wd isn't already root
// which by definition, is '/'
if(wd != "/") {
wd.append("/");
}
// append the bit that we want to tab-complete
(void)wd.append(toBeCompleted);
} else { // absolute
// path begins with a '/' so must be absolute, thus
// make workng path the actual token
wd = toBeCompleted;
}
// run the tab-completion algorithm and get the tab-completed string back
tabCompleted = tabCompleteTeaSafeEntry(theBfs, wd);
len = (boost::filesystem::path(toBeCompleted).filename()).string().length();
} else {
tabCompleted = tabCompleteCommand(comTokens[0]);
len = comTokens[0].length();
}
// how long is the original fname length prior to tab-completion?
// Subtract from the original string this many characyers
std::string copy(toReturn.begin(), toReturn.end() - len);
copy.swap(toReturn);
cursorPos -= len;
// now append tab completed bit
toReturn.append(tabCompleted);
// updated cursor position based on returned string
cursorPos += tabCompleted.length();
// after effect of pressing tab, need to print out prompt
// and where we were with toReturn again
std::cout<<"ts$> "<<toReturn;
}
int main(int argc, char *argv[])
{
setProgramStatus(EDITOR);
if (argc == 1)
{
printf(1, "please input the command as [editor file_name]\n");
setProgramStatus(SHELL);
exit();
}
//存放文件内容
char *text[MAX_LINE_NUMBER] = {};
text[0] = malloc(MAX_LINE_LENGTH);
memset(text[0], 0, MAX_LINE_LENGTH);
//存储当前最大的行号，从0开始。即若line_number == x，则从text[0]到text[x]可用
int line_number = 0;
//尝试打开文件
int fd = open(argv[1], O_RDONLY);
//如果文件存在，则打开并读取里面的内容
if (fd != -1)
{
char buf[BUF_SIZE] = {};
int len = 0;
while ((len = read(fd, buf, BUF_SIZE)) > 0)
{
int i = 0;
int next = 0;
int is_full = 0;
while (i < len)
{
//拷贝"\n"之前的内容
for (i = next; i < len && buf[i] != '\n'; i++)
;
strcat_n(text[line_number], buf+next, i-next);
//必要时新建一行
if (i < len && buf[i] == '\n')
{
if (line_number >= MAX_LINE_NUMBER - 1)
is_full = 1;
else
{
line_number++;
text[line_number] = malloc(MAX_LINE_LENGTH);
memset(text[line_number], 0, MAX_LINE_LENGTH);
}
}
if (is_full == 1 || i >= len - 1)
break;
else
next = i + 1;
}
if (is_full == 1)
break;
}
close(fd);
}
//输出文件内容
show_text(text);
//输出帮助
com_help(text);
//处理命令
char input[MAX_LINE_LENGTH] = {};
while (1)
{
printf(1, "\nplease input command:\n");
memset(input, 0, MAX_LINE_LENGTH);
gets(input, MAX_LINE_LENGTH);
int len = strlen(input);
input[len-1] = '\0';
len --;
//寻找命令中第一个空格
int pos = MAX_LINE_LENGTH - 1;
int j = 0;
for (; j < 8; j++)
{
if (input[j] == ' ')
{
pos = j + 1;
break;
}
}
//ins
if (input[0] == 'i' && input[1] == 'n' && input[2] == 's')
{
if (input[3] == '-')
com_ins(text, atoi(&input[4]), &input[pos]);
else
com_ins(text, line_number+1, &input[pos]);
//插入操作需要更新行号
line_number = get_line_number(text);
}
//mod
else if (input[0] == 'm' && input[1] == 'o' && input[2] == 'd')
{
if (input[3] == '-')
com_mod(text, atoi(&input[4]), &input[pos]);
else
com_mod(text, line_number + 1, &input[pos]);
}
//del
else if (input[0] == 'd' && input[1] == 'e' && input[2] == 'l')
{
if (input[3] == '-')
com_del(text, atoi(&input[4]));
else
com_del(text, line_number + 1);
//删除操作需要更新行号
line_number = get_line_number(text);
}
else if (strcmp(input, "show") == 0)
{
auto_show = 1;
printf(1, "enable show current contents after text changed.\n");
}
else if (strcmp(input, "hide") == 0)
{
auto_show = 0;
printf(1, "disable show current contents after text changed.\n");
}
else if (strcmp(input, "help") == 0)
com_help(text);
else if (strcmp(input, "save") == 0 || strcmp(input, "CTRL+S\n") == 0)
com_save(text, argv[1]);
else if (strcmp(input, "exit") == 0)
com_exit(text, argv[1]);
else
{
printf(1, "invalid command.\n");
com_help(text);
}
}
setProgramStatus(SHELL);
exit();
}