/* dclick.cpp
 * by Derek Bruening
 * May 2002
 *
 * Updated 2010-11-10 by Thomas Perl <thp.io/about>:
 *  - Make it compile on newer versions of Cygwin
 *  - Convert "/" to "\" (so "dclick ../test.pdf" works)
 *
 * equivalent of DOS shell "start" command: launches a file using the
 * shell as though it were double-clicked in explorer
 *
 * To build using Cygwin's gcc, simply use:
 *    gcc dclick.cpp -o dclick
 */
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 * USA.
 */

#include <windows.h>
#include <stdio.h>
#include <assert.h>

int main(int argc, char *argv[])
{
    if (argc < 2) {
        fprintf(stderr, "Usage: %s <filename> <args...>\n", argv[0]);
        return 1;
    }

    TCHAR cwd[MAX_PATH];
    int cwd_res = GetCurrentDirectory(MAX_PATH, cwd);
    assert(cwd_res > 0);

    TCHAR *params = (TCHAR *) malloc(sizeof(TCHAR) * (argc-1) * MAX_PATH);
    TCHAR *cur = params;
    int i;
    int len, left = (argc-1) * MAX_PATH;
    for (i = 2; i < argc; i++) {
        len = snprintf(cur, left, "%s ", argv[i]);
        if (len < 0) {
            /* hit max */
            cur += left - 1;
            fprintf(stderr, "Warning: hit parameter buffer limit\n");
            break;
        }
        left -= len;
        cur += len;
    }
    *cur = '\0';

    /* Replace the "/" path separator with "\" (in Cygwin) */
    for (i=0, cur=argv[1]; cur[i]; i++) {
        if (cur[i] == '/') cur[i] = '\\';
    }

    fprintf(stderr, "Opening \"%s\" with parameters \"%s\"\n", argv[1], params);
    // tell explorer to "open" the file
    HINSTANCE res = ShellExecute(NULL, "open", 
                                 argv[1], (LPCTSTR) params, cwd, SW_SHOWNORMAL);

    free(params);
    if ((int)res <= 32) {
        int errnum = GetLastError();
        LPVOID lpMsgBuf;
        FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 
                      FORMAT_MESSAGE_FROM_SYSTEM | 
                      FORMAT_MESSAGE_IGNORE_INSERTS,
                      NULL,  errnum,
                      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
                      (LPTSTR) &lpMsgBuf, 0, NULL);
        // Display the string.
        fprintf(stderr, "Error opening \"%s\":\n\t%s\n", argv[1], lpMsgBuf);
        // Free the buffer.
        LocalFree(lpMsgBuf);
        return 1;
    }
    return 0;
}