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inpuft.hpp
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inpuft.hpp
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/* MIT License
#
# Copyright (c) 2020 Ferhat Geçdoğan All Rights Reserved.
# Distributed under the terms of the MIT License.
#
# */
#include <algorithm>
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <unistd.h>
#include <termios.h>
/* Fegeya Inpuft a work-in-progress & really simple replacement of readline.
* TODO:
* History initialization.
* Arrow (Left, Right) support with buffer refreshing.
* UTF-8 support.
*/
/* Some of ASCII values */
#define ARROW_UP 65
#define ARROW_LEFT 68
#define ARROW_RIGHT 67
#define ARROW_DOWN 66
#define ESCAPE 27
#define BACKSPACE 127
#define __BACKSPACE 8
#define H_TAB 9
#define SPACE 32
#define PUT(str) std::cout << str << std::flush;
#define INPUT(ch) ch = getchar();
static struct termios _new,
_old;
/* For initialize cursor position */
typedef struct {
public:
unsigned int x = 0;
unsigned int y = 0;
} pos_t;
class Inpuft {
public:
std::vector<std::string> unsupported_terms = {
"emacs",
"xterm-256color",
};
std::vector<std::string>::iterator iter;
pos_t cursor = GetPosition();
char ch;
std::string data,
history_file;
unsigned total_line,
current_line;
public:
void Init(bool echo); /* With input as string */
~Inpuft();
void GetInput(bool echo, bool unsupported);
void SetPosition(pos_t pos);
pos_t GetPosition();
void InitTermios(bool echo);
void ResetTermios();
void BuffBack(unsigned int i);
/* For history */
void InitFile(std::string file);
unsigned GetTotalHistoryLine();
std::string GetSpecificHistoryLine(unsigned line);
};
void
Inpuft::Init(bool echo) {
iter = std::find(unsupported_terms.begin(), unsupported_terms.end(), getenv("TERM"));
if(iter != unsupported_terms.end()) {
/* Arrow keys detection not supported for unsupported term/s */
do {
GetInput(echo, true);
} while(ch != '\n');
} else {
do {
GetInput(echo, false);
} while(ch != '\n');
}
}
Inpuft::~Inpuft() {
data.erase();
}
void
Inpuft::GetInput(bool echo, bool unsupported) {
InitTermios(false);
INPUT(ch)
switch(ch) {
case SPACE:
{
PUT(" ")
data.append(" ");
break;
}
case BACKSPACE:
{
if(data.length() > 0) {
PUT("\b \b")
data.pop_back();
cursor.x--;
}
break;
}
case ARROW_LEFT:
{
PUT("")
/* Ignore */
break;
}
case ARROW_RIGHT:
{
PUT("")
/* Ignore */
break;
}
case ARROW_UP:
{
if(unsupported == true) break;
if(current_line != 0) {
current_line--;
BuffBack(data.length());
data = GetSpecificHistoryLine(current_line);
PUT(data)
/* TODO:
* Colorize if fetched data is available on system
* Add Colorized library.
*/
}
break;
}
case ARROW_DOWN:
{
PUT("")
if(unsupported == true) break;
if(current_line < total_line) {
current_line++;
BuffBack(data.length());
data = GetSpecificHistoryLine(current_line);
PUT(data)
}
break;
}
case H_TAB:
{
/* Ignore */
break;
}
default:
{
data.push_back(ch);
cursor.x++;
PUT(ch)
break;
}
}
}
void
Inpuft::SetPosition(pos_t pos) {
PUT("\033[" +
std::to_string(pos.y + 1)
+ ";"
+ std::to_string(pos.x + 1) + "H")
}
pos_t
Inpuft::GetPosition() {
pos_t _pos;
scanf("\033[%d;%dR", &_pos.x, &_pos.y);
return _pos;
}
void
Inpuft::InitTermios(bool echo) {
tcgetattr(0, &_old);
_new = _old;
_new.c_lflag &= ~ICANON;
_new.c_lflag &= ~ECHO;
tcsetattr(0, TCSANOW, &_new);
_new.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
}
void
Inpuft::ResetTermios() {
tcsetattr(STDIN_FILENO, TCSAFLUSH, &_old);
}
void
Inpuft::BuffBack(unsigned int i) {
for(unsigned f = 0; f < i; f++) {
std::cout << "\b \b" << std::flush;
}
}
void
Inpuft::InitFile(std::string file) {
history_file = file;
total_line = GetTotalHistoryLine();
current_line = GetTotalHistoryLine();
}
unsigned
Inpuft::GetTotalHistoryLine() {
/* TODO:
Check file[0] to if is a file (foo_history.txt) or directory (/home/foo/foo_history.txt)
*/
std::ifstream history_stream(history_file);
std::string line;
unsigned i;
for (i = 0; std::getline(history_stream, line); ++i)
;
history_stream.close();
return i;
}
std::string
Inpuft::GetSpecificHistoryLine(unsigned line) {
std::ifstream history_stream(history_file);
unsigned __line = 0;
std::string data;
while(getline(history_stream, data)) {
if(line == __line) {
return data;
}
__line++;
}
history_stream.close();
return data;
}