查找項目中文件的相對路徑

Question

我將項目文件設置為以下格式：

/home/user/proj/source
/home/user/proj/source/src1
/home/user/proj/source/src1
/home/user/proj/header ...etc

查看任何源文件時，我都有一種查找項目路徑的方法

"/home/user/proj"

同樣，（buffer-file-name）給出了給定源文件的完整絕對路徑。

如何編寫提取源文件相對路徑的lisp函數？

意思是，如果我正在查看

/home/user/proj/source/src1/file.c

我想走這條路

"source/src1/file.c"

以下功能為我提供了項目路徑：

(defun upward-find-file (filename &optional startdir)
  (let ((dirname (expand-file-name
          (if startdir startdir ".")))
    (found nil) ; found is set as a flag to leave loop if we find it
    (top nil))  ; top is set when we get
            ; to / so that we only check it once
    ; While we've neither been at the top last time nor have we found
    ; the file.
    (while (not (or found top))
      ; If we're at / set top flag.
      (if (string= (expand-file-name dirname) "/")
      (setq top t))
      ; Check for the file
      (if (file-exists-p (expand-file-name filename dirname))
      (setq found t)
    ; If not, move up a directory
    (setq dirname (expand-file-name ".." dirname))))
    ; return statement
    (if found (concat dirname "/") nil)))

我在主項目文件夾中始終有“ Makefile”，因此

(setq dirname (upward-find-file "Makefile" startdir))

照顧的。

Answer 1

嘗試locate-dominating-file和file-relative-name 。

(let ((fname (buffer-file-name)))
  (file-relative-name fname (locate-dominating-file fname "Makefile")))

注意如果找不到任何內容， locate-dominiating-file返回nil 。

Answer 2

這個怎么樣：

(defun file-name-make-relative (filename reference)
  (interactive)
  (let ((reduced-path-reference)
        (common-pos 0)
        (depth 0)
        (pos 0)
        (retval ""))
    (while (eq (aref filename common-pos) (aref reference common-pos))
      (setq common-pos (+ common-pos 1)))
    (setq reduced-path-reference (substring reference (+ common-pos 1)))
    (while (< pos (length (substring reference (+ common-pos 1))))
      (if (eq (aref reduced-path-reference pos) (aref "/" 0))
          (setq depth (+ depth 1)))
      (setq pos (+ pos 1)))
    (dotimes (i depth)
      (setq retval (concat retval "../")))
    (setq retval (concat retval (substring filename common-pos)))
    retval))

它沒有經過非常徹底的測試，但是，在我的簡單測試用例中，它按預期工作。 給定文件filename和引用目錄reference （必須帶有斜杠，我不記得是哪個函數自動執行，有人可以注釋嗎？），該函數將計算從reference到filename的相對路徑。

例：

(file-name-make-relative "/usr/local/bin/exec" "/usr/local/root/bin/")

結果：

"../../bin/exec"

Answer 3

安裝f.el ，一個全面的文件和目錄操作庫。 然后運行f-relative函數：

(f-relative "some/path/is/long" "some/path/was/short") ; => "../../is/long"

Answer 4

您可以根據需要調整此代碼：

(defun java-package-name (file)
  "Generates package name for FILE, based on path."
  (let* ((f (file-name-directory file))
         (rem
          (car
           (sort
            (delq nil
                  (mapcar
                   (lambda(x)
                     (and (string-match (expand-file-name x) f) 
                          (substring f (match-end 0))))
                   (parse-colon-path (getenv "CLASSPATH"))))
            (lambda (a b) (< (length a) (length b)))))))
    (cond
     ((null rem)
      "Not on CLASSPATH.")
     ((= 0 (length rem))
      "At root of CLASSPATH")
     (t
      (mapconcat
       #'downcase
       (delete "" (split-string rem "[\\\\/]"))
       ".")))))