nvictor

for f in *.txt; do mv "$f" "$(echo $f | tr '[A-Z]' '[a-z]')"; done

nvictor

# python repositories, sorted by stars descending
https://www.github.com/topics/python?o=desc&s=stars

nvictor

select name, pg_size_pretty(pg_database_size(datname)) as size from pg_database;

nvictor

ffmpeg -i input.mp3 output.wav

nvictor

ffmpeg -i input.mp3 -ss hh:mm:ss.lll -t ddd -acodec copy output.mp3

nvictor

#include <stdarg.h>  # va_list, va_start, va_end
#include <stdio.h>  # vprintf
#include <stdlib.h>  # exit

void fatal(const char *format, ...) {
    va_list args;
    va_start(args, format);
    printf("Fatal: ");
    vprintf(format, args);
    printf("\n");

nvictor

#include <windows.h>

// Win32 API programs entry point
// 1. C might give you a hard time if you don't name the parameters
// 2. use __stdcall, which is an alias for WINAPI, which is an alias for APIENTRY, etc...
int __stdcall wWinMain(
  // call it module, not instance (back in the days modules share multiple instances, not anymore).
  HINSTANCE module,
  // previous "instance", not often used
  HINSTANCE previous,

nvictor

void create_window(HINSTANCE module, LPCTSTR class_name, LPCTSTR title) {
    // 1. filling WNDCLASS / WNDCLASSEX
    // wc = {} and wc {.hCursor = ..., .hInstance = ...} don't work in VS2017
    WNDCLASS wc = {0};
    
    // Only 3 components are necessary
    // hCursor sets the cursor for when the mouse is over the window
    wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
    // hInstance is the handle to the module's instance 
    // and lpszClassName is the window class name.

nvictor

LRESULT __stdcall window_proc(HWND window, UINT message, WPARAM wparam, LPARAM lparam) {
    switch(message) {
        // calls to BeginPaint and EndPaint are still needed
        // even when using newer rendering engines
        case WM_PAINT:
            {
                  PAINTSTRUCT ps;
                  VERIFY(BeginPaint(window, &ps));
                  EndPaint(window, &ps);
            }

nvictor

// basic version
void process_messages1() {
    MSG message;
    BOOL result;
    // GetMessage() blocks and waits for a message
    // returns 0 when it sees WM_QUIT
    // returns -1 when something goes wrong
    // returns a nonzero when there is a valid message to dispatch
    while (result = GetMessage(&message, 0, 0, 0)) {
        if (result != -1) {