misc

#!/usr/bin/env bash

# OS specific support.
darwin=false;
case "$(uname -s)" in
  Darwin*)
    darwin=true
    ;;
esac

RED='\033[0;31m'; B_RED='\033[1;31m'
GREEN='\033[0;32m'; B_GREEN='\033[1;32m'
YELLOW='\033[0;33m'; B_YELLOW='\033[1;33m'
BLUE='\033[0;34m'; B_BLUE='\033[1;34m'
MAGENTA='\033[0;35m'; B_MAGENTA='\033[1;35m'
CYAN='\033[0;36m'; B_CYAN='\033[1;36m'
WHITE='\033[0;37m'; B_WHITE='\033[1;37m'
NC='\033[0m' # Return to default colour

export WORKDIR="$HOME/projects"
export COLUMNS
export LINES

if [ "$darwin" = "false" ]; then
  alias open='xdg-open'
fi

# make sure WORKDIR exists
mkdir -p "$WORKDIR"

usagesort() {
  du -h -d 1 "$1" | sort -k 1,1 -g
}

is_app_installed() {
  command -v "$1" &>/dev/null
}

check_dotfile() {
  # if file is a symbolic link but broken, 
  # delete it so it can be recreated
  local dotfile="$1"
  local src="$2"
  [[ ! -r $dotfile && -L $dotfile ]] && rm "$dotfile"
  [[ -r $dotfile ]] || ln -s "$src" "$dotfile"
}

die() {
  echo -e "${RED}$@${NC}" >&2
  exit 1
}

error() {
  echo -e "${B_RED}[ERROR]${NC} ${RED}$@${NC}"
}

warn() {
  echo -e "${B_YELLOW}[WARN]${NC} ${YELLOW}$@${NC}"
}

info() {
  echo -e "${B_GREEN}[INFO]${NC} ${GREEN}$@${NC}"
}

debug() {
  echo -e "${B_CYAN}[DEBUG]${NC} ${CYAN}$@${NC}"
}

if ! is_app_installed realpath; then
realpath() {
  OURPWD=${PWD}
  cd "$(dirname "${1}")"
  LINK=$(readlink "$(basename "${1}")")
  while [ "$LINK" ]; do
    cd "$(dirname "$LINK")"
    LINK=$(readlink "$(basename "${1}")")
  done
  REALPATH="${PWD}/$(basename "${1}")"
  cd "$OURPWD"
  echo "$REALPATH"
}
fi

relPath() {
    local common path up
    common=$(realpath "${1}")
    path=$(realpath "${2}")
    while test "${path#"$common"/}" = "$path"; do
        common=${common%/*} 
        up=../$up
    done
    path=$up${path#"$common"/} 
    path=${path%/}; printf %s "${path:-.}"
}

try-lock() {
  __LOCKFILE="${TMPDIR:-/tmp}/$1"
  if ( set -o noclobber; : > "$__LOCKFILE" ) &>/dev/null; then
    trap 'rm -f "${__LOCKFILE}" &>/dev/null' INT TERM EXIT RETURN
    return 0
  fi
  return 1
}

function pathmunge() {
  # prevent duplicate directories in your PATH variable
  if [[ -d "${1:-}" && ! $PATH =~ (^|:)"${1}"($|:) ]]; then
    export PATH="${1}:$PATH"
  fi
}

# from https://github.com/robhague/dotfiles/
function _ensure_cwd {
  # If the working directory doesn't exist, try and find one that does
  if [ ! -d "$PWD" ]
  then
    warn "$PWD no longer exists, "
    D=$PWD
    while [[ $D && ! -d $D && $D = */* ]]
    do
      D=${D%/*}
    done
    builtin cd "$D"
    info "moved to $PWD"
  fi
}