Run static checks and build on githooks. Bash script with progress display

precommit.sh

#!/bin/bash

######################################
## Utilities
######################################
success () {
  printf "\r\033[2K  [ \033[00;32mOK\033[0m ] $1\n"
}

info () {
  printf "  [\033[00;34mINFO\033[0m] $1\n"
}

fail () {
  printf "\r\033[2K  [\033[0;31mFAIL\033[0m] $1\n"
  echo ''
  exit 1
}

safe_run () {
    set +e
    local log="&>/dev/null &"

    eval "$1 $log"
    pid=$! # Process Id of the previous running command

    # Show progress bar
    spin[0]="-"
    spin[1]="\\"
    spin[2]="|"
    spin[3]="/"

    echo -n "  ${spin[0]}"
    while kill -0 $pid 2>/dev/random; do
        for i in "${spin[@]}"; do
            echo -ne "\b$i"
            sleep 0.1
        done
    done

    # read the status of background process
    wait $pid
    # Handle the error
    if [[ $? -ne 0 ]]; then
        if [[ -n "${2+x}" ]]; then
            fail "$2"
        else
            fail "$1 failed"
        fi
        set -e
        exit 1
    fi
}

######################################
## Checks
######################################

# Try to build the app
info "Building the app"
cd app
safe_run "npm run build -s", "Build Failed"
success "Build Done"

# Linter
info "Linting"
safe_run "npm run lint -s", "Lint failed"
success "Lint Successful"

# Unittests
info "Runnin Unittests"
safe_run "npm test -s", "Unitests have failed"
success "Unittests Passed"

# Do checks on client
info "Linting"
safe_run "npm run lint -s", "Client ESLint Failed"
success "Lint Successful"