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There is a function defined in /usr/share/zsh/functions/Completion/Unix/_git

(( $+functions[_git-diff] )) ||
_git-diff () {
  local curcontext=$curcontext state line ret=1
  declare -A opt_args

  local -a diff_options diff_stage_options
  __git_setup_diff_options
  __git_setup_diff_stage_options

  _arguments -C -s $endopt \
    $* \
    $diff_options \
    '(--exit-code)--quiet[disable all output]' \
    $diff_stage_options \
    '(--cached --staged)--no-index[show diff between two paths on the filesystem]' \
    '(--cached --staged --no-index)'{--cached,--staged}'[show diff between index and named commit]' \
    '(-)--[start file arguments]' \
    '*:: :->from-to-file' && ret=0

  case $state in
    (from-to-file)
      # If "--" is part of $opt_args, this means it was specified before any
      # $words arguments. This means that no heads are specified in front, so
      # we need to complete *changed* files only.
      if [[ -n ${opt_args[(I)--]} ]]; then
        if [[ -n ${opt_args[(I)--cached|--staged]} ]]; then
          __git_changed-in-index_files && ret=0
        else
          __git_changed-in-working-tree_files && ret=0
        fi
        return ret
      fi

      # If "--no-index" was given, only file paths need to be completed.
      if [[ -n ${opt_args[(I)--no-index]} ]]; then
        _alternative 'files::_files' && ret=0
        return ret
      fi

      # Otherwise, more complex conditions need to be checked.
      case $CURRENT in
        (1)
          local files_alt='files::__git_changed-in-working-tree_files'
          if [[ -n ${opt_args[(I)--cached|--staged]} ]]; then
            files_alt='files::__git_changed-in-index_files'
          fi

          _alternative \
            'commit-ranges::__git_commit_ranges' \
            'blobs-and-trees-in-treeish::__git_blobs_and_trees_in_treeish' \
            $files_alt \
            'blobs::__git_blobs ' && ret=0
          ;;
        (2)
          # Check if first argument is something special. In case of committish ranges and committishs offer a full list compatible completions.
          if __git_is_committish_range $line[1]; then
            # Example: git diff branch1..branch2 <tab>
            __git_tree_files ${PREFIX:-.} $(__git_committish_range_last $line[1]) && ret=0
          elif __git_is_committish $line[1] || __git_is_treeish $line[1]; then
            # Example: git diff branch1 <tab>
            _alternative \
              'commits::__git_commits' \
              'blobs-and-trees-in-treeish::__git_blobs_and_trees_in_treeish' \
              'files::__git_tree_files ${PREFIX:-.} HEAD' && ret=0
          elif __git_is_blob $line[1]; then
            _alternative \
              'files::__git_cached_files' \
              'blobs::__git_blobs' && ret=0
          elif [[ -n ${opt_args[(I)--cached|--staged]} ]]; then
            # Example: git diff --cached file1 <tab>
            __git_changed-in-index_files && ret=0
          else
            # Example: git diff file1 <tab>
            __git_changed-in-working-tree_files && ret=0
          fi
          ;;
        (*)
          if __git_is_committish_range $line[1]; then
            # Example: git diff branch1..branch2 file1 <tab>
            __git_tree_files ${PREFIX:-.} $(__git_committish_range_last $line[1]) && ret=0
          elif { __git_is_committish $line[1] && __git_is_committish $line[2] } ||
              __git_is_treeish $line[2]; then
            # Example: git diff branch1 branch2 <tab>
            __git_tree_files ${PREFIX:-.} $line[2] && ret=0
          elif __git_is_committish $line[1] || __git_is_treeish $line[1]; then
            # Example: git diff branch file1 <tab>
            # Example: git diff branch -- f<tab>
            __git_tree_files ${PREFIX:-.} HEAD && ret=0
          elif __git_is_blob $line[1] && __git_is_blob $line[2]; then
            _nothing
          elif [[ -n ${opt_args[(I)--cached|--staged]} ]]; then
            # Example: git diff --cached file1 file2 <tab>
            __git_changed-in-index_files && ret=0
          else
            # Example: git diff file1 file2 <tab>
            __git_changed-in-working-tree_files && ret=0
          fi
          ;;
      esac
      ;;
  esac

  return ret
}

I just need to append

'files::__git_changed_files ${PREFIX:-.} HEAD' \

Above

'files::__git_tree_files ${PREFIX:-.} HEAD' && ret=0

Currently I have copy pasting the new function in my .zshrc, and it is working.

However, I think there is a cleaner way using:

_git-diff 2>/dev/null 
functions[_git-diff-orig]=$functions[_git-diff]  
_git-diff() {
    _git-diff-orig "$@"
    ... 
} 

But I am not sure how to do it. Can anyone please help.



Read more here: https://stackoverflow.com/questions/64400459/modify-an-existing-function-from-bashrc-or-zshrc

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