Diff your repo files via FZF

.zshrc

# ----------------------------------
# Function: gdcp
# Description: 
#   This function allows you to interactively select a file from the list of modified files 
#   in a Git repository, view the diff, and copy it to the clipboard.
#   
# Parameters:
#   None
#   
# Returns:
#   None
#   
# Usage:
#   gdcp [-h|--help]
#   
# Example:
#   gdcp
# ----------------------------------
gdcp() {
    # Check if the function is called with -h or --help flag
    if [[ "$1" == "-h" || "$1" == "--help" ]]; then
        echo "Usage: gdcp [-h|--help]"
        echo "Interactively select a file from the list of modified files,"
        echo "view the diff, and copy it to the clipboard."
        echo ""
        echo "Options:"
        echo "  -h, --help    Show this help message and exit."
        return 0
    # Check for invalid parameters
    elif [[ -n "$1" ]]; then
        echo "Invalid parameter: $1"
        echo "Usage: gdcp [-h|--help]"
        return 1
    fi
    
    # Main functionality of the function
    git status -s | cut -d' ' -f3 |
      fzf --bind "enter:become(git diff {1} | cb copy)" \
        --bind "ctrl-n:preview-down,ctrl-p:preview-up" \
        --bind "ctrl-f:preview-page-down,ctrl-b:preview-page-up" \
        --preview "git diff {1} | bat --color=always -p" \
        --preview-window "right,55%,border-left"
}

Same function for Mercurial hg:

hdcp() {
    hg status -admnr |
      fzf --bind "enter:become(git diff {1} | cb copy)" \
        --bind "ctrl-n:preview-down,ctrl-p:preview-up" \
        --bind "ctrl-f:preview-page-down,ctrl-b:preview-page-up" \
        --preview "hg diff -g {1} | bat --color=always -p" \
        --preview-window "right,55%,border-left"
}

More helpful functions for hg:

hglv() {
    hg log --template "{rev} {desc|strip|firstline}\n" -b. |
      fzf --bind "enter:become(hg log -p -r {1} | tail -n +7 |cb copy)" \
        --bind "ctrl-n:preview-down,ctrl-p:preview-up" \
        --bind "ctrl-f:preview-page-down,ctrl-b:preview-page-up" \
        --preview "hg log -p -r {1} | bat --color=always -p -r 7: -l diff" \
        --preview-window "right,55%,border-left"
}

hgadd() {
  hg status -dmnru |
    fzf --bind "enter:become(hg add {1})" \
        --bind "ctrl-n:preview-down,ctrl-p:preview-up" \
        --bind "ctrl-f:preview-page-down,ctrl-b:preview-page-up" \
        --preview "hg diff {1} | bat --color=always -p -l diff" \
        --preview-window "right,55%,border-left"
}