helm的弹出窗口如何固定弹出位置为下半屏？现在竖排多个窗口时会使用最右边窗口
几乎啥也看不到了。。
期望无论我窗口如何，都使用下图的位置
分享给小配置给你
(setq split-width-threshold nil) ;分屏的时候使用上下分屏
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我喜欢左右分，竖屏能看到的东西多一点。。
你不是要固定下面吗？
第一楼不是告诉你方法了吗？
如果你要平常左右分屏， helm 固定下面分屏， 你就需要自己给 helm 关键函数写 advice.
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d:/software/MSYS2/home/Administrator/.emacs.d/elpa/helm-core-20221113.1706/helm-core.el
(defun helm-split-window-default-fn (window)
"Default function to split windows before displaying `helm-buffer'.
It is used as default value for
`helm-split-window-preferred-function' which is then the
let-bounded value of `split-window-preferred-function' in
`helm-display-buffer'. When `helm-display-function' which default
to `helm-default-display-buffer' is called from
`helm-display-buffer' the value of
`split-window-preferred-function' will be used by
`display-buffer'."
(let* (split-width-threshold
(win (if (and (fboundp 'window-in-direction)
;; Don't try to split when starting in a minibuffer
;; e.g M-: and try to use helm-show-kill-ring.
(not (minibufferp helm-current-buffer)))
;; (if (or (one-window-p t)
;; helm-split-window-inside-p)
(split-window
(selected-window) nil
(if (eq helm-split-window-default-side 'other)
helm-split-window-other-side-when-one-window
helm-split-window-default-side))
;; If more than one window reuse one of them.
;; (cl-case helm-split-window-default-side
;; (left (or (helm-window-in-direction 'left)
;; (helm-window-in-direction 'above)
;; (selected-window)))
;; (above (or (helm-window-in-direction 'above)
;; (helm-window-in-direction 'left)
;; (selected-window)))
;; (right (or (helm-window-in-direction 'right)
;; (helm-window-in-direction 'below)
;; (selected-window)))
;; (below (or (helm-window-in-direction 'below)
;; (helm-window-in-direction 'right)
;; (selected-window)))
;; (same (selected-window))
;; (other (or (helm-other-window-for-scrolling)
;; (selected-window)))
;; (t (or (window-next-sibling) (selected-window)))))
(split-window-sensibly window))
))
(setq helm-persistent-action-window-buffer (window-buffer win))
win))
从源码找到了 如果多窗口时的分屏代码，虽然看不懂在干啥，但是注释掉只留下单窗口的情况，倒是实现了固定往下，但是我觉得肯定又什么设置可以实现，不至于这样。。我记得以前看过custom face还是啥的，见到有人设置过固定helm，可能是spacemacs时候看到的。
display-buffer-alist, 详见 文档
固定选用 bottom 的窗口:
(add-to-list 'display-buffer-alist
'("^\\*helm .*"
(display-buffer-at-bottom)))
也可以让它用 side window:
(add-to-list 'display-buffer-alist
'("^\\*helm .*"
(display-buffer-in-side-window)
(side . bottom)))
display-buffer 机制是 emacs 里通用的，你可以用它来定制任何「弹窗」的位置。第三方的辅助包有 shackle 等，可以用来简化 display-buffer-alist 的定制。
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* *Helm Swoop* 3717 Hmm
* *helm mini* 2517 Hmm
* *helm M-x* 125 Hmm
Helm Swoop哪个没有被匹配上， “^\Helm .” “^\[Hh]elm .” 我试了这两个，都不行，这是啥问题。
看了下 helm-swoop 的代码，他用 helm-swoop-split-window-function 覆盖了 helm-display-function，所以 Emacs 自己的 display-buffer-alist 机制不起效。
一个解决办法是重新改回来:
(setq helm-swoop-split-window-function 'helm-default-display-buffer)
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搞定，这个厉害了！
使用display-buffer-in-side-window的问题是，当对candidate使用tab键，打开helm action时，会报错「Cannot split side window or parent of side window」。因此此方法还需要对helm-show-action-buffer进行hack