getmicro/getmicro.sh

#!/bin/sh

# This script installs micro.
# Modified from https://getmic.ro by gearsix

printError() {
	>&2 echo $1
}

checkPermissions() {
	if [ ! -r $GETMICRO_INSTALLDIR ] || [ ! -w $GETMICRO_INSTALLDIR ]; then
		printError "'$GETMICRO_INSTALLDIR': Permission denied"
		exit
	fi
}

githubLatestTag() {
  latestJSON="$( eval "$http 'https://api.github.com/repos/$1/releases/latest'" 2>/dev/null )" || true
  
  versionNumber=''
  if ! echo "$latestJSON" | grep 'API rate limit exceeded' >/dev/null 2>&1 ; then
    if ! versionNumber="$( echo "$latestJSON" | grep -oEm1 '[0-9]+[.][0-9]+[.][0-9]+' - 2>/dev/null )" ; then
      versionNumber=''
    fi
  fi
  
  if [ "${versionNumber:-x}" = "x" ] ; then
    # Try to fallback to previous latest version detection method if curl is available
    if command -v curl >/dev/null 2>&1 ; then
      if finalUrl="$( curl "https://github.com/$1/releases/latest" -s -L -I -o /dev/null -w '%{url_effective}' 2>/dev/null )" ; then
        trimmedVers="${finalUrl##*v}"
        if [ "${trimmedVers:-x}" != "x" ] ; then
          echo "$trimmedVers"
          exit 0
        fi
      fi
    fi
    
    printError "HTTP File download failed."
    exit 1
  else
    echo "$versionNumber"
  fi
}


# get HTTP fetch command
if command -v curl >/dev/null 2>&1 ; then
  http="curl -L"
elif command -v wget >/dev/null 2>&1 ; then
  http="wget -O-"
else
  printError "Couldn't find commands 'curl' or 'wget' on your system."
  exit 1
fi

# get platform
platform=''
machine=$(uname -m)

if [ "${GETMICRO_PLATFORM:-x}" != "x" ]; then
  platform="$GETMICRO_PLATFORM"
else
  case "$(uname -s | tr '[:upper:]' '[:lower:]')" in
    "linux")
      case "$machine" in
        "arm64"* | "aarch64"* ) platform='linux-arm64' ;;
        "arm"* | "aarch"*) platform='linux-arm' ;;
        *"86") platform='linux32' ;;
        *"64") platform='linux64' ;;
      esac
      ;;
    "darwin") platform='osx' ;;
    *"freebsd"*)
      case "$machine" in
        *"86") platform='freebsd32' ;;
        *"64") platform='freebsd64' ;;
      esac
      ;;
    "openbsd")
      case "$machine" in
        *"86") platform='openbsd32' ;;
        *"64") platform='openbsd64' ;;
      esac
      ;;
    "netbsd")
      case "$machine" in
        *"86") platform='netbsd32' ;;
        *"64") platform='netbsd64' ;;
      esac
      ;;
    "msys"*|"cygwin"*|"mingw"*|*"_nt"*|"win"*)
      case "$machine" in
        *"86") platform='win32' ;;
        *"64") platform='win64' ;;
      esac
      ;;
  esac
fi

if [ "${platform:-x}" = "x" ]; then
  printError "Couldn't automatically detect operating system.
Set GETMICRO_PLATFORM to one of the following values:

- freebsd32
- freebsd64
- linux-arm
- linux-arm64
- linux32
- linux64
- netbsd32
- netbsd64
- openbsd32
- openbsd64
- osx
- win32
- win64
"
  exit 1
fi

# get latest tag version
TAG=$(githubLatestTag zyedidia/micro)

if command -v grep >/dev/null 2>&1 ; then
  if ! echo "v$TAG" | grep -E '^v[0-9]+[.][0-9]+[.][0-9]+$' >/dev/null 2>&1 ; then
    printError "Recieved an invalid tag and cannot be sure that the tag will not break this script."
    echo "> $TAG" 1>&2
    exit 1
  fi
fi

# check if latestTag already installed
if [ $(command -v micro) ] && [ "$(micro -version | grep $TAG)" != "" ]; then exit; fi

# get file extension
if [ "${platform:-x}" = "win64" ] || [ "${platform:-x}" = "win32" ]; then
  extension='zip'
else
  extension='tar.gz'
fi

# if Musl libc; use the staticly-compiled versioon
if [ "${platform:-x}" = "linux64" ]; then
  # Detect musl libc (source: https://stackoverflow.com/a/60471114)
  libc=$(ldd /bin/ls | grep 'musl' | head -1 | cut -d ' ' -f1)
  if [ -n "$libc" ]; then
    platform='linux64-static'
  fi
fi

# set GETMICRO_INSTALLDIR
GETMICRO_INSTALLDIR=/usr/local/bin

if [ -d "$1" ]; then GETMICRO_INSTALLDIR="$1"; fi

checkPermissions

echo "Detected platform: $platform"
echo "Latest Version: $TAG"
echo "Downloading https://github.com/zyedidia/micro/releases/download/v$TAG/micro-$TAG-$platform.$extension"

eval "$http 'https://github.com/zyedidia/micro/releases/download/v$TAG/micro-$TAG-$platform.$extension'" > "micro.$extension"

case "$extension" in
  "zip") unzip -j "micro.$extension" -d "micro-$TAG" ;;
  "tar.gz") tar -xvzf "micro.$extension" "micro-$TAG/micro" ;;
esac

mv "micro-$TAG/micro" ./micro

rm "micro.$extension"
rm -rf "micro-$TAG"

mv ./micro $GETMICRO_INSTALLDIR/micro

echo "Micro has been installed successfully."