build: add installation script

scripts/install-termsvg.sh

@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+
+function get_termsvg() {
+  local DIST=""
+  local EXT=""
+  local FILENAME=""
+  local KERNEL=""
+  local MACHINE=""
+  local TMP_DIR=""
+  local URL=""
+  local TAG=""
+  local VER=""
+
+  # Get the current released tag_name
+  TAG=$(curl -sL https://api.github.com/repos/mrmarble/termsvg/releases \
+        | grep tag_name | head -n1 | cut -d'"' -f4)
+
+  if [ -n "${TAG}" ]; then
+    URL="https://github.com/MrMarble/termsvg/releases/download/${TAG}"
+    VER="${TAG:1}"
+  else
+    echo "ERROR! Could not retrieve the current termsvg version number."
+    exit 1
+  fi
+
+  # Get kernel name and machine architecture.
+  KERNEL=$(uname -s)
+  MACHINE=$(uname -m)
+
+  # Determine the target distrubution
+  if [ "${KERNEL}" == "Linux" ]; then
+    EXT="tar.gz"
+    if [ "${MACHINE}" == "i386" ]; then
+      DIST="linux-386"
+    elif [ "${MACHINE}" == "x86_64" ]; then
+      DIST="linux-amd64"
+    elif [ "${MACHINE}" == "armv6l" ]; then
+      DIST="linux-armv6"
+    elif [ "${MACHINE}" == "armv7l" ]; then
+      DIST="linux-armv7"
+    elif [ "${MACHINE}" == "aarch64" ]; then
+      DIST="linux-arm64"
+    fi
+  elif [ "${KERNEL}" == "Darwin" ]; then
+    EXT="zip"
+    if [ "${MACHINE}" == "x86_64" ]; then
+      DIST="darwin-amd64"
+    elif [ "${MACHINE}" == "arm64" ]; then
+      DIST="darwin-arm64"
+    fi
+  elif [ "${KERNEL}" == "FreeBSD" ]; then
+    EXT="tar.gz"
+    if [ "${MACHINE}" == "i386" ]; then
+      DIST="freebsd-386"
+    elif [ "${MACHINE}" == "x86_64" ]; then
+      DIST="freebsd-amd64"
+    elif [ "${MACHINE}" == "armv6l" ]; then
+      DIST="freebsd-armv6"
+    elif [ "${MACHINE}" == "armv7l" ]; then
+      DIST="freebsd-armv7"
+    fi
+  else
+    echo "ERROR! ${KERNEL} is not a supported platform."
+    exit 1
+  fi
+
+  # Was a known distribution detected?
+  if [ -z "${DIST}" ]; then
+    echo "ERROR! ${MACHINE} is not a supported architecture."
+    exit 1
+  fi
+
+  # Derive the filename
+  FILENAME="termsvg-${VER}-${DIST}.${EXT}"
+
+  echo " - Downloading ${URL}/${FILENAME}"
+  TMP_DIR=$(mktemp --directory)
+  curl -sLo "${TMP_DIR}/${FILENAME}" "${URL}/${FILENAME}"
+
+  echo " - Unpacking ${FILENAME}"
+  if [ "${EXT}" == "zip" ]; then
+    unzip -qq -o "${TMP_DIR}/${FILENAME}" -d "${TMP_DIR}"
+  elif [ "${EXT}" == "tar.gz" ]; then
+    tar -xf "${TMP_DIR}/${FILENAME}" --directory "${TMP_DIR}"
+  else
+    echo "ERROR! Unexpected file extension."
+    exit 1
+  fi
+
+  # /usr/local/bin should be present on Linux and macOS hosts. Just be sure.
+  if [ -d /usr/local/bin ]; then
+    echo " - Placing termsvg in /usr/local/bin"
+    mv "${TMP_DIR}/termsvg-${VER}-${DIST}/termsvg" /usr/local/bin/
+    chmod +x /usr/local/bin/termsvg
+
+    echo " - Cleaning up"
+    rm -rf "${TMP_DIR}"
+    echo -en " - "
+    termsvg --version
+  else
+    echo "ERROR! /usr/local/bin is not present. Install aborted."
+    rm -rf "${TMP_DIR}"
+    exit 1
+  fi
+
+}
+
+echo "termsvg scripted install"
+
+if [ "$(id -u)" -ne 0 ]; then
+  echo "ERROR! You must run this script as root."
+  exit 1
+fi
+
+get_termsvg