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where-are-we: find out the context when reading (any) source code

From: Haojun Bao
Subject: where-are-we: find out the context when reading (any) source code
Date: Wed, 18 Aug 2010 23:31:32 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (gnu/linux)

Hi, all

I have wrote a little lisp and a perl script to tell where I am when I'm
reading source code. The lisp code is short: 

    (defun where-are-we ()
         1 (point) 
         (concat "where-are-we " 
                 (or (buffer-file-name) (buffer-name))
                 (format " %s" tab-width)))))

The perl script (also named where-are-we) is attached. When invoked on
the last line of the above lisp code, the output is like following:

    /home/bhj/windows-config/.emacs:1005:              (format " %s" 
        (defun where-are-we ()
             (concat "where-are-we " 
    =>               (format " %s" tab-width)))))

Another example from reading Android source code:

                outFlags[codeIndex] = 1;
         * Inspect the known devices to determine whether physical keys exist 
for the given
         * framework-domain key codes.
        bool EventHub::hasKeys(size_t numCodes, int32_t* keyCodes, uint8_t* 
outFlags) {
            for (size_t codeIndex = 0; codeIndex < numCodes; codeIndex++) {
                for (int n = 0; (n < mFDCount) && (outFlags[codeIndex] == 0); 
n++) {
                    if (mDevices[n]) {
                        if (!err) {
                            for (size_t sc = 0; sc < scanCodes.size(); sc++) {
                                if (test_bit(scanCodes[sc], 
mDevices[n]->keyBitmask)) {
    =>                              outFlags[codeIndex] = 1;

Supposedly this can be useful when reading source code and taking note,
even better if used with remember.el. That way, you can easily write a
scenario analysis about which function called which function and so

Hope you can find it useful.

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