Example of why ident attribute doesn't work in Git like CSV/SVN

id-example.zsh

#!/bin/zsh

# Make any non-zero return fatal just in case
setopt err_exit

source =(curl https://gist.githubusercontent.com/treyharris/c486c9f8776802e270b7/raw/2d0519826f3b8ca8446f59211ecd0dc738221d3d/showshell.zsh 2> /dev/null)

local dir=/tmp/ident-test
local files=5

show "Setting up ${dir}" "
  rm -rf ${dir}
  mkdir ${dir}
  cd ${dir}
"

show "Setting up git" "
  git init

  echo '*.txt ident' > .gitattributes
"

for file ({1..${files}}.txt) {
  echo '$Id$' > ${file}
  git add "${file}"
  git commit -m "Adding ${file}"
}

show "Show we do have ${files} commits for each file:" "
  git log --stat  --oneline --decorate
"

show "Show the current contents" "
  cat *.txt
"

show "Git doesn't replace the \$Id\$ token until it must write the file" "
  rm *
  git reset --hard
  cat *.txt
"