[psychonic]

It seems some people still struggle with this so here is a copy/paste way of detecting click button presses/releases in your plugins.

Make sure to include sdktools at the top of your plugin if it's not there already

#include <sdktools> 

These also need to go somewhere near the top of the file

#define MAX_BUTTONS 25
new g_LastButtons[MAXPLAYERS+1];

If you don't already have these forwards, add them, else just add the contents

public OnClientDisconnect_Post(client)
{
    g_LastButtons[client] = 0;
}

public Action:OnPlayerRunCmd(client, &buttons, &impulse, Float:vel[3], Float:angles[3], &weapon)
{
    for (new i = 0; i < MAX_BUTTONS; i++)
    {
        new button = (1 << i);
        
        if ((buttons & button))
        {
            if (!(g_LastButtons[client] & button))
            {
                OnButtonPress(client, button);
            }
        }
        else if ((g_LastButtons[client] & button))
        {
            OnButtonRelease(client, button);
        }
    }
    
    g_LastButtons[client] = buttons;
    
    return Plugin_Continue;
}

Now you can use these function to detect the buttons

OnButtonPress(client, button)
{
    // do stuff
}

OnButtonRelease(client, button)
{
    // do stuff
}

List of detectable buttons at time of writing (full list here):

#define IN_ATTACK      (1 << 0)
#define IN_JUMP   (1 << 1)
#define IN_DUCK   (1 << 2)
#define IN_FORWARD    (1 << 3)
#define IN_BACK   (1 << 4)
#define IN_USE      (1 << 5)
#define IN_CANCEL      (1 << 6)
#define IN_LEFT   (1 << 7)
#define IN_RIGHT        (1 << 8)
#define IN_MOVELEFT  (1 << 9)
#define IN_MOVERIGHT        (1 << 10)
#define IN_ATTACK2    (1 << 11)
#define IN_RUN      (1 << 12)
#define IN_RELOAD      (1 << 13)
#define IN_ALT1   (1 << 14)
#define IN_ALT2   (1 << 15)
#define IN_SCORE        (1 << 16)       // Used by client.dll for when scoreboard is held down
#define IN_SPEED        (1 << 17)   // Player is holding the speed key
#define IN_WALK   (1 << 18)    // Player holding walk key
#define IN_ZOOM   (1 << 19)    // Zoom key for HUD zoom
#define IN_WEAPON1    (1 << 20) // weapon defines these bits
#define IN_WEAPON2    (1 << 21) // weapon defines these bits
#define IN_BULLRUSH  (1 << 22)
#define IN_GRENADE1  (1 << 23)    // grenade 1
#define IN_GRENADE2  (1 << 24)    // grenade 2