implemented main function

src/term.c

@@ -0,0 +1,95 @@
+#include "term.h"
+#include <unistd.h>
+#include IFWIN("windows.h", "sys/ioctl.h")
+
+bool term_init(){
+#if defined(_WIN64) || defined(_WIN32)
+    DWORD mode=0;
+    HANDLE h;
+
+    // configure stdout
+    h = GetStdHandle(STD_OUTPUT_HANDLE);
+    if(h == INVALID_HANDLE_VALUE)
+        return false;
+    GetConsoleMode(h, &mode);
+    mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+    mode |= ENABLE_PROCESSED_OUTPUT;
+    SetConsoleMode(h, mode);
+    
+    // configure stdin
+    h = GetStdHandle(STD_INPUT_HANDLE);
+    if(h == INVALID_HANDLE_VALUE)
+        return false;
+    GetConsoleMode(h, &mode);
+    mode |= ENABLE_VIRTUAL_TERMINAL_INPUT;
+    mode |= ENABLE_PROCESSED_INPUT;
+    SetConsoleMode(h, mode);
+#endif
+
+    return true;
+}
+
+int getenv_int(const char* var_name){
+    char* str=getenv(var_name);
+    if(str==NULL)
+        return -1;
+    return strtol(str, NULL, 0);
+}
+
+bool term_getSize(TerminalSize* out) {
+#if defined(_WIN64) || defined(_WIN32)
+    // helps when STD_OUT is redirected to a file
+    HANDLE hConsoleErr = GetStdHandle(STD_ERROR_HANDLE);
+    CONSOLE_SCREEN_BUFFER_INFO consoleInfo;
+    if(!GetConsoleScreenBufferInfo(hConsoleErr, &consoleInfo))
+        return false;
+    
+    out->cols = consoleInfo.srWindow.Right - consoleInfo.srWindow.Left + 1;
+    out->rows = consoleInfo.srWindow.Bottom - consoleInfo.srWindow.Top + 1;
+#else
+    struct winsize ws = {0};
+    // try to get terminal size from stdin, stdout, stderr
+    if (ioctl(STDIN_FILENO,  TIOCGWINSZ, &ws)==0 ||
+        ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws)==0 ||
+        ioctl(STDERR_FILENO, TIOCGWINSZ, &ws)==0 ){
+        out->cols=ws.ws_col;
+        out->rows=ws.ws_row;
+    }
+    // try to get size from environtent variables
+    else {
+        out->cols=getenv_int("COLUMNS");
+        out->rows=getenv_int("LINES");
+    }
+#endif
+
+    return out->cols > 0 && out->rows > 0;
+}
+
+/*
+Most of escape sequences can be found there
+https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797
+*/
+
+void term_resetCursor() {
+    printf("\e[H");
+}
+
+void term_resetColors() {
+    printf("\e[0m");
+}
+
+void term_clear() {
+    printf("\e[0m\e[H\e[2J");
+}
+
+void term_cursorMove(u16 row, u16 column) {
+    printf("\e[%u;%uH",row,column);
+}
+
+void term_cursorHide() {
+    printf("\e[?25l");
+}
+
+void term_cursorShow() {
+    printf("\e[?25h");
+}