st 是一個非常簡單的終端軟件，對我來說只缺少一個功能，就是多路服用（上下左右切分窗口），這在其他終端軟件中都有提供，比如說 wezterm。
而 tmux 剛好可以提供這個功能：
tmux split-window # 向下切分
tmux split-window -h # 向右切分
然後就可以在 st 中設置快捷鍵：
{{< block type="details" >}}
/* 切分 */
static char *sp[] = { "/bin/sh", "-c", "tmux split-window","externalpipe", NULL };
static char *sph[] = { "/bin/sh", "-c", "tmux split-window -h","externalpipe", NULL };
/* 切換窗口 */
static char *gd[] = { "/bin/sh", "-c", "tmux select-pane -D","externalpipe", NULL };
static char *gu[] = { "/bin/sh", "-c", "tmux select-pane -U","externalpipe", NULL };
static char *gr[] = { "/bin/sh", "-c", "tmux select-pane -R","externalpipe", NULL };
static char *gl[] = { "/bin/sh", "-c", "tmux select-pane -L","externalpipe", NULL };
/* 調整窗口大小 */
static char *rd[] = { "/bin/sh", "-c", "tmux resize-pane -D 2","externalpipe", NULL };
static char *ru[] = { "/bin/sh", "-c", "tmux resize-pane -U 2","externalpipe", NULL };
static char *rr[] = { "/bin/sh", "-c", "tmux resize-pane -R 2","externalpipe", NULL };
static char *rl[] = { "/bin/sh", "-c", "tmux resize-pane -L 2","externalpipe", NULL };
static Shortcut shortcuts[] = {
{ ControlMask, XK_minus, externalpipe, {.v = sp } },
{ ControlMask, XK_backslash, externalpipe, {.v = sph } },
{ MODKEY, XK_Up, externalpipe, {.v = gu} },
{ MODKEY, XK_Down, externalpipe, {.v = gd} },
{ MODKEY, XK_Left, externalpipe, {.v = gl} },
{ MODKEY, XK_Right, externalpipe, {.v = gr} },
{ ControlMask, XK_Up, externalpipe, {.v = ru} },
{ ControlMask, XK_Down, externalpipe, {.v = rd} },
{ ControlMask, XK_Left, externalpipe, {.v = rl} },
{ ControlMask, XK_Right, externalpipe, {.v = rr} },
};
{{< /block >}}
最後關閉 tmux 的 status line，因為我只需要它的 pane 功能，其他的都太碍眼了。
set -g status off
