Using git to identify all modified functions in a revision

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Here is a magic chant to list functions within a git diff *

git diff |                  \
grep -E '^(@@)' |           \
grep "(" |                  \
sed 's/@@.*@@//' |          \
sed 's/(.*//' |             \
awk -F " " '{print $NF}' |  \
uniq

…and what it does is…

  1. Picks the current diff,
  2. next picks only lines with “hunk-headers” ,
  3. next picks only lines with opening parenthesis (as potentially containing function names),
  4. next ignores the hunk headers,
  5. next ignores the text after the opening parenthesis,
  6. next picks only the word immediately before the opening parenthesis,
  7. and lastly ignores multiple occurrences of the same word in the list.

Voila! you have a list of functions being modified by the current git diff.

* Verified using git version 2.7.4 on Ubuntu 16.04 running bash.

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