Inverse replacement with environment variables

[akm]

Replace string which is not preferred to show outside to environment variable name.

For example, if you have environment variable HOME=/Users/foo and executed command output /Users/foo/credentials/bar, git-exec will replace it to $HOME/credentials/bar on build commit message.

Exceptions

• value has only numeric, only space or too short string like:
  • KCODE=u
  • PS1='$ '
  • TERM_PROGRAM_VERSION=453
  • XPC_FLAGS=0x0
  • XPC_SERVICE_NAME=0
• value which might match as other means
  • CLOUDSDK_PYTHON=python3
  • OLDPWD=...
  • PWD=...
  • SHELL