install

#!/usr/bin/env bash

# CircleCI CLI Multi-File-Config installer script.
#
# WARNING: This is a very rough implementation, and is still work in progress.
# This script will modify files in the target repo, use at your own risk.
#
# This installer copies the relevant files from copythis.circleci to the
# target repo, and attempts to install the git pre-commit hook if there is
# no pre-commit hook already in the repo.

TARGET="$1"

set -euo pipefail

log() { echo "==> $1" 1>&2; }
die() { log "FATAL: $1"; exit 1; }

usage() {
  echo "usage: $(basename "$0") <target dir>";
  exit 1
}

SRC="$PWD"
export SRC

[ -d "$SRC/copythis.circleci" ] || die "./copythis.circleci dir not found."
SRC=$SRC/copythis.circleci
[ -n "$TARGET" ] || usage
[ -d "$TARGET" ] || die "TARGET not a directory ($TARGET)"

# Strip trailing / and /.circleci[/]
TARGET="${TARGET%/}"
TARGET="${TARGET%/.circleci}"

log "Installing to repo rooted at $TARGET"

(
  cd "$TARGET"
  mkdir -p .circleci/config
  (
    [ ! -f .circleci/config.yml ] || {
      [ ! -f .circleci/config/@config.yml ] || {
        log "Existing config detected: not modifying."
        exit 0 # Exit from this subshell.
      }
      log "Moving $TARGET/.circleci/config.yml -> $TARGET/.circleci/config/@config.yml"
      mv .circleci/config.yml .circleci/config/@config.yml
      make -C .circleci ci-config
    }
  )
  cd .circleci
  log "Copying Makefile, .gitattributes, .gitignore and README.md"
  cp "$SRC"/{Makefile,.gitattributes,.gitignore,README.md} ./
  # Re-gen the config now in case it needs to change due to updated Makefile.
  make ci-config
  cd ..
  [ ! -d .git ] || {
    mkdir -p .git/hooks
    cd .git/hooks
    if [ -f pre-commit ]; then
      log ".git/hooks/pre-commit already exists, please install hook manually"
    else
      log "Installing git pre-commit hook to $TARGET/.git/hooks/"
      cp "$SRC/pre-commit" ./
    fi
  }  
)