build_cmake.sh

#! /bin/bash

# ##########################################################
# functions - 1

sis_cmake_is_truey() {
  case "$(printf '%s' "${1:-}" | tr '[:upper:]' '[:lower:]')" in

    1|ok|on|true|yes|y)

      return 0
    ;;
    *)

      return 1
      ;;
  esac
}


# ##########################################################
# constants and variables

Basename=$(basename "$0")
Dir=$(cd "$(dirname "$0")" && pwd)
CMakeDir=${SIS_CMAKE_BUILD_DIR:-$Dir/_build}
ProjectNameFile="$Dir/.sis/project_name.txt"
ProjectName=$(tr -d '[:space:]' < "$ProjectNameFile")
ScriptPath=$0

AlwaysUseColours=${SIS_CMAKE_ALWAYS_USE_COLOURS:-${SIS_ALWAYS_USE_COLOURS:-0}}
IgnoreRemainingFlagsAndOptions=0
SisUseColours=0
Targets=()


# ##########################################################
# colours
#
# Enable when tput is available and either:
#   - AlwaysUseColours is set (overrides NO_COLOR; may set TERM if
#     empty/dumb), or
#   - NO_COLOR is unset, stdout is a TTY, and TERM is not dumb (union of
#     collect-c's "TERM set + TTY" and cstring's "TTY" — empty TERM on a
#     TTY is OK).

SisClr_Blue=
SisClr_Bold=
SisClr_Green=
SisClr_None=
SisClr_Red=
SisClr_Yellow=

for arg in "$@"; do

  case $arg in
    --always-use-colors|--always-use-colours|-A)

      AlwaysUseColours=1
      ;;
  esac
done

if command -v tput >/dev/null 2>&1; then

  if [ $AlwaysUseColours -ne 0 ]; then

    if [ -z "${TERM:-}" ] || [ "$TERM" = "dumb" ]; then

      TERM=xterm-256color
    fi

    SisUseColours=1
  elif [ -z "${NO_COLOR:-}" ] && [ -t 1 ] && [ "${TERM:-}" != "dumb" ]; then

    SisUseColours=1
  fi
fi

if [ $SisUseColours -ne 0 ]; then

  SisClr_Blue=${FG_BLUE:-$(tput setaf 4)}
  SisClr_Bold=${FD_BOLD:-$(tput bold)}
  SisClr_Green=${FG_GREEN:-$(tput setaf 2)}
  SisClr_None=${FD_NONE:-$(tput sgr0)}
  SisClr_Red=${FG_RED:-$(tput setaf 1)}
  SisClr_Yellow=${FG_YELLOW:-$(tput setaf 3)}
fi

CMakeDirClr="${SisClr_Blue}${SisClr_Bold}${CMakeDir}${SisClr_None}"
ProjectNameClr="${SisClr_Blue}${SisClr_Bold}${ProjectName}${SisClr_None}"
ScriptPathClr="${SisClr_Blue}${SisClr_Bold}${ScriptPath}${SisClr_None}"


# ##########################################################
# functions - 2

sis_cmake_build() {

  local config="${SIS_CMAKE_CONFIG:-Release}"
  local args=(--build "$CMakeDir")
  if [ -f "$CMakeDir/CMakeCache.txt" ] && grep -q '^CMAKE_CONFIGURATION_TYPES:' "$CMakeDir/CMakeCache.txt" 2>/dev/null; then

    args+=(--config "$config")
  fi
  if [ "$#" -gt 0 ]; then

    local t
    for t in "$@"; do

      args+=(--target "$t")
    done
  fi

  cmake "${args[@]}"
}


# ##########################################################
# command-line handling

while [[ $# -gt 0 ]]; do

  if [ $IgnoreRemainingFlagsAndOptions -ne 0 ]; then

    Targets+=("$1")
    shift
    continue
  fi

  if [ "${1:0:1}" != '-' ]; then

    Targets+=("$1")
    shift
    continue
  fi

  case $1 in
    --)

      IgnoreRemainingFlagsAndOptions=1
      ;;
    --always-use-colors|--always-use-colours|-A)

      # AlwaysUseColours=1 - this is handled by the for loop above
      ;;
    --help)

      [ -f "$Dir/.sis/script_info_lines.txt" ] && cat "$Dir/.sis/script_info_lines.txt"
      cat << EOF
Executes CMake-generated artefacts to (re)build project

${ScriptPath} [ ... flags/options ... ]

Flags/options:

    behaviour:

        (no arguments)
            builds all default targets

        <target> ...
            builds one or more specific targets

    -A
    --always-use-colors
    --always-use-colours
        forces use of colours even when stdout is not a TTY


    standard flags:

    --help
        displays this help and terminates

EOF

      exit 0
      ;;
    *)

      >&2 echo "${ScriptPathClr}: unrecognised argument '${SisClr_Red}${SisClr_Bold}$1${SisClr_None}'; use --help for usage"

      exit 1
      ;;
  esac

  shift
done


# ##########################################################
# main()

if [ ! -d "$CMakeDir" ] || [ ! -f "$CMakeDir/CMakeCache.txt" ]; then

  >&2 echo "${ScriptPathClr}: CMake build directory '${CMakeDirClr}' not found or not configured; use script 'prepare_cmake.sh' first"

  exit 1
fi

if [ ${#Targets[@]} -eq 0 ]; then

  echo "Executing build of ${ProjectNameClr} (via cmake --build)"
  sis_cmake_build
  status=$?
else

  echo "Executing build of ${ProjectNameClr} (via cmake --build) with specific target(s): ${Targets[*]}"
  sis_cmake_build "${Targets[@]}"
  status=$?
fi

exit $status


# ############################## end of file ############################# #