Node:Several files recursively, Next:Prepare the data, Previous:Several files, Up:Words in a defun
while loop, you can work on each of a list of files
with recursion. A recursive version of
is short and simple.
The recursive function has the usual parts: the `do-again-test', the
`next-step-expression', and the recursive call. The `do-again-test'
determines whether the function should call itself again, which it
will do if the
list-of-files contains any remaining elements;
the `next-step-expression' resets the
list-of-files to the
CDR of itself, so eventually the list will be empty; and the
recursive call calls itself on the shorter list. The complete
function is shorter than this description!
(defun recursive-lengths-list-many-files (list-of-files) "Return list of lengths of each defun in LIST-OF-FILES." (if list-of-files ; do-again-test (append (lengths-list-file (expand-file-name (car list-of-files))) (recursive-lengths-list-many-files (cdr list-of-files)))))
In a sentence, the function returns the lengths' list for the first of
list-of-files appended to the result of calling itself on
the rest of the
Here is a test of
recursive-lengths-list-many-files, along with
the results of running
lengths-list-file on each of the files
lengths-list-file, if necessary, and then evaluate the
following expressions. You may need to change the files' pathnames;
those here work when this Info file and the Emacs sources are located
in their customary places. To change the expressions, copy them to
*scratch* buffer, edit them, and then evaluate them.
The results are shown after the
=>. (These results are
for files from Emacs Version 21.0.100; files from other versions of
Emacs may produce different results.)
(cd "/usr/local/share/emacs/21.0.100/") (lengths-list-file "./lisp/macros.el") => (273 263 456 90) (lengths-list-file "./lisp/mail/mailalias.el") => (38 32 26 77 174 180 321 198 324) (lengths-list-file "./lisp/makesum.el") => (85 181) (recursive-lengths-list-many-files '("./lisp/macros.el" "./lisp/mail/mailalias.el" "./lisp/makesum.el")) => (273 263 456 90 38 32 26 77 174 180 321 198 324 85 181)
recursive-lengths-list-many-files function produces the
output we want.
The next step is to prepare the data in the list for display in a graph.