删除emacs中rgrep/grep输出的头信息？

Question

这是我运行rgrep时缓冲区的样子。我只想看看我的结果 - 所有其他信息对我来说都没有意义。

-*- mode: grep; default-directory: "~/.emacs/" -*- 
Grep started at Sat Jan 20 12:42:21 

grep --exclude=.\#\* --exclude=\*.o --exclude=\*\~ --exclude=\*.bin --exclude=\*.lbin --exclude=\*.so --exclude=\*.a --exclude=\*.ln --exclude=\*.blg --exclude=\*.bbl --exclude=\*.elc --exclude=\*.lof --exclude=\*.glo --exclude=\*.idx --exclude=\*.lot --exclude=\*.fmt --exclude=\*.tfm --exclude=\*.class --exclude=\*.fas --exclude=\*.lib --exclude=\*.mem --exclude=\*.x86f --exclude=\*.sparcf --exclude=\*.dfsl --exclude=\*.pfsl --exclude=\*.d64fsl --exclude=\*.p64fsl --exclude=\*.lx64fsl --exclude=\*.lx32fsl --exclude=\*.dx64fsl --exclude=\*.dx32fsl --exclude=\*.fx64fsl --exclude=\*.fx32fsl --exclude=\*.sx64fsl --exclude=\*.sx32fsl --exclude=\*.wx64fsl --exclude=\*.wx32fsl --exclude=\*.fasl --exclude=\*.ufsl --exclude=\*.fsl --exclude=\*.dxl --exclude=\*.lo --exclude=\*.la --exclude=\*.gmo --exclude=\*.mo --exclude=\*.toc --exclude=\*.aux --exclude=\*.cp --exclude=\*.fn --exclude=\*.ky --exclude=\*.pg --exclude=\*.tp --exclude=\*.vr --exclude=\*.cps --exclude=\*.fns --exclude=\*.kys --exclude=\*.pgs --exclude=\*.tps --exclude=\*.vrs --exclude=\*.pyc --exclude=\*.pyo -i -nH -e grep *.el 

    init.el:236:(global-set-key (kbd "s-f") 'rgrep) 
    init.el:237:(global-set-key (kbd "C-f") 'lgrep) 

Grep finished (matches found) at Sat Jan 20 12:42:21 

Answer 1

头插入被埋内rgrepcompilation-start深通话中。没有简单的方法来阻止这些函数插入标题。但是通过定义建议，你可以很容易地隐藏缓冲区的前四行。

(defun delete-grep-header() 
    (save-excursion 
    (with-current-buffer grep-last-buffer 
     (goto-line 5) 
     (narrow-to-region (point) (point-max))))) 

(defadvice grep (after delete-grep-header activate) (delete-grep-header)) 
(defadvice rgrep (after delete-grep-header activate) (delete-grep-header)) 

您可以稍后扩大与C-Xň瓦特再次显示这些行。

如果你也想奉劝lgrep，grep-find和​​，你可以用一个纲领性建议这样替换上面的defadvice宏：

(defvar delete-grep-header-advice 
    (ad-make-advice 
    'delete-grep-header nil t 
    '(advice lambda() (delete-grep-header)))) 

(defun add-delete-grep-header-advice (function) 
    (ad-add-advice function delete-grep-header-advice 'after 'first) 
    (ad-activate function)) 

(mapc 'add-delete-grep-header-advice 
     '(grep lgrep grep-find rgrep zrgrep)) 

Answer 2

加入少量的迈克尔·霍夫曼的回答是：我们可以添加一个小按钮到的grep缓冲器切换隐藏的文本：

(defmacro with-grep-buffer-writable (&rest body) 
    `(save-excursion 
    (with-current-buffer grep-last-buffer 
     (setq buffer-read-only nil) 
     ,@body 
     (setq buffer-read-only t)))) 

(defun hide-grep-header (&rest ignored) 
    "Hides (by narrowing) the first few lines of a grep buffer leaving only 
the results. Additionally, a button is created to toggle the lines." 
    (with-grep-buffer-writable 
    ;;HACK: If we (goto-line 5), the button is inserted *after* the results. 
    (goto-line 4) 
    (end-of-line) 
    (insert "\n") 
    (narrow-to-region (point) (point-max)) 
    (insert-text-button "(...)" 
         'help-echo "Toggle display of grep invocation" 
         'action #'click-show-grep-button))) 

(defun click-hide-grep-button (button) 
    (with-grep-buffer-writable 
    (button-put button 'action #'click-show-grep-button) 
    (narrow-to-region (button-start button) (point-max)))) 

(defun click-show-grep-button (button) 
    (with-grep-buffer-writable 
    (button-put button 'action #'click-hide-grep-button) 
    (widen)) 
    ; HACK: goto-line won't have any effect because of save-excursion 
    (with-current-buffer grep-last-buffer 
    (goto-line 1))) 

(advice-add 'grep :after #'hide-grep-header) 
(advice-add 'rgrep :after #'hide-grep-header)