Add bash helper script

vim-copilot-setup.md

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+# vim-copilot-setup.sh
+
+This `bash` script:
+
+1. ensures this git repo is up to date locally
+2. checks dependencies
+3. then runs setup
+4. outputs helpful next steps.
+
+First time:
+
+`curl -s https://raw.githubusercontent.com/github/copilot.vim/refs/heads/release/vim-copilot-setup.sh | bash`
+
+Subsequent times:
+
+`~/.vim/pack/github/start/copilot.vim/vim-copilot-setup.sh`

vim-copilot-setup.sh

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+#!/bin/bash
+
+function starting () {
+    echo "$1 …"
+}
+
+function isdone () {
+   echo " … done!"
+   echo ""
+}
+
+function warn () {
+    level="W"
+
+    local caller_info=$(caller 0)
+    if [[ $caller_info == *"die"* ]]; then
+       level="E"
+    fi
+
+    echo "[$level] $1" 1>&2
+}
+
+function die () {
+    warn "$1"
+    exit -1
+}
+
+function ensure_git () {
+    starting "Ensuring git repo"
+
+    git --version
+    if [ "$?" -ne 0 ]; then
+        die "Install \`git\` and try again"
+    fi
+
+    if [ -d ~/.vim/pack/github/start/copilot.vim ]; then
+        git -C ~/.vim/pack/github/start/copilot.vim pull
+    else
+        git clone https://github.com/github/copilot.vim.git ~/.vim/pack/github/start/copilot.vim
+    fi
+
+    isdone
+}
+
+function check_prereq () {
+    starting "Checking prereqs"
+
+    min_vim=9
+    min_node=18
+
+    vim_ver=$(vim --version | head -n 1 | awk '{print $5}')
+    if [[ $(echo "$vim_ver < $min_vim" | bc -l) -eq 1 ]]; then
+       die "need vim version $min_vim or newer"
+    fi
+
+    node_ver=$(node -v | awk -F. '{print $1}' | sed 's/^v//')
+    if [[ "$node_ver" -lt "$min_node" ]]; then
+        die "need node version $min_node or newer"
+    fi
+
+    isdone
+}
+
+function do_setup () {
+    starting "Initializing set up"
+
+    vim -S ~/.vim/pack/github/start/copilot.vim/vim-copilot-setup.vim
+
+    isdone
+}
+
+function run () {
+    ensure_git
+    check_prereq
+    do_setup # or only do first time (if cloned) or when given --setup?
+
+    echo "For more info:"
+    echo "  * \`cat ~/.vim/pack/github/start/copilot.vim/doc/copilot.txt\`"
+    echo "  * \`:help copilot\` for more information."
+}
+
+run

vim-copilot-setup.vim

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+Copilot setup