git-add-pre-commit-hook.sh

#!/usr/bin/env bash

PRE_COMMIT_HOOK_FILE=".git/hooks/pre-commit"

if [[ -f $PRE_COMMIT_HOOK_FILE ]]; then
  echo "File .git/hooks/pre-commit already exists"
  ls -lsah $PRE_COMMIT_HOOK_FILE
  cat $PRE_COMMIT_HOOK_FILE
  exit 1
else
  case $1 in

  elixir)
    tee -a $PRE_COMMIT_HOOK_FILE > /dev/null <<EOF
#!/usr/bin/env bash
set -e
BRANCH_NAME=\$(git branch | grep '*' | sed 's/* //')
if [ "\$BRANCH_NAME" != '(no branch)' ]
then
    mix format --check-formatted --dry-run
fi
EOF
    ;;

  rust)
    tee -a $PRE_COMMIT_HOOK_FILE > /dev/null <<EOF
#!/usr/bin/env bash
set -e
BRANCH_NAME=\$(git branch | grep '*' | sed 's/* //')
if [ "\$BRANCH_NAME" != '(no branch)' ]
then
    cargo fmt -- --check
fi
EOF
    ;;

  v)
    tee -a $PRE_COMMIT_HOOK_FILE > /dev/null <<EOF
#!/usr/bin/env bash
set -e
BRANCH_NAME=\$(git branch | grep '*' | sed 's/* //')
if [ "\$BRANCH_NAME" != '(no branch)' ]
then
    v fmt -c .
fi
EOF
    ;;

  go)
    tee -a $PRE_COMMIT_HOOK_FILE > /dev/null <<EOF
#!/usr/bin/env bash
set -e
BRANCH_NAME=\$(git branch | grep '*' | sed 's/* //')
if [ "\$BRANCH_NAME" != '(no branch)' ]
then
    go vet ./...
    test -z $(gofmt -l .)
fi
EOF
    ;;

  make-lint)
    tee -a $PRE_COMMIT_HOOK_FILE > /dev/null <<EOF
#!/usr/bin/env bash
set -e
BRANCH_NAME=\$(git branch | grep '*' | sed 's/* //')
if [ "\$BRANCH_NAME" != '(no branch)' ]
then
    make lint
fi
EOF
    ;;

  *)
    echo "Error: argument not given or unknown. Expected one of: elixir, rust, v, go, make-lint"
    exit 1
    ;;
  esac

chmod u+x $PRE_COMMIT_HOOK_FILE
fi