install golang

golang/golang.bash

@@ -0,0 +1,112 @@
+#!/bin/bash
+
+# title: Go
+# homepage: https://golang.org
+# tagline: The Go Programming Language tools
+# description: |
+#   Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
+
+set -e
+set -u
+
+# TODO handle v1.4 / go1.4 / lack of go1.4.0
+GOLANG_VER=${WEBI_VERSION:-}
+GOLANG_VER="${GOLANG_VER:-go}" # Search for 'go' at the least
+
+# WEBI_ARCH uses only slightly different names from GOLANG_ARCH
+GOLANG_OS="${WEBI_OS}" # linux or darwin
+GOLANG_ARCH="${WEBI_ARCH}"
+if [ "x86" == "$GOLANG_ARCH" ]; then
+  GOLANG_ARCH="386"
+fi
+
+my_tmp="$WEBI_TMP"
+sudo_cmd="$WEBI_SUDO"
+
+#########
+# BEGIN #
+#########
+
+get_golang_version() {
+  # sort -rV    # will sort by version number, but it appears these are already sorted
+  # cut -f 1    # gets only the first column
+  # head -n 1   # gets only the most recent version
+  #  <td class="filename"><a class="download" href="https://dl.google.com/go/go1.13.4.darwin-amd64.tar.gz">go1.13.4.darwin-amd64.tar.gz</a></td>
+  my_char="."
+  my_count=$(awk -F"${my_char}" '{print NF-1}' <<< "${GOLANG_VER}")
+  # get the latest version if partial
+  if [ $my_count -ne 2 ]; then
+    if [ "$GOLANG_VER" != "go" ]; then
+      GOLANG_VER="$GOLANG_VER\\."
+    fi
+    get_http=""
+    if [ -n "$(type -p curl)" ]; then
+      get_http="curl -fsL"
+    elif [ -n "$(type -p wget)" ]; then
+      get_http="wget --quiet -O -"
+    else
+      echo "Found neither 'curl' nor 'wget'. Can't Continue."
+      exit 1
+    fi
+    GOLANG_VER=$($get_http "https://golang.org/dl/" | grep filename.*download | grep ${GOLANG_VER} | grep ${GOLANG_ARCH} | grep ${GOLANG_OS} | cut -d '"' -f 6 | cut -d '/' -f5 | cut -d '.' -f 1-3 | sed 's/\.\(freebsd\|darwin\|linux\|windows\|src\).*//' | head -n 1) \
+        || echo 'error automatically determining current Golang version'
+  fi
+}
+
+get_golang_version
+
+#
+# golang
+#
+golang_install_path=$HOME/.local/opt/${GOLANG_VER}
+mkdir -p $golang_install_path
+
+# TODO warn if existing golang in path my take precedence
+if [ -e "$golang_install_path/bin/go" ]; then
+  # golang of some version is already installed
+  #echo "${GOLANG_VER}" == "$($golang_install_path/bin/go version | cut -d ' ' -f 3 2>/dev/null)"
+  if [ "${GOLANG_VER}" == "$($golang_install_path/bin/go version | cut -d ' ' -f 3 2>/dev/null)" ]; then
+    echo ${GOLANG_VER} already installed at $golang_install_path
+    exit 0
+  fi
+fi
+
+GOLANG_PRE="${GOLANG_VER}.${GOLANG_OS}-${GOLANG_ARCH}"
+GOLANG_REMOTE="https://dl.google.com/go/${GOLANG_PRE}.tar.gz"
+GOLANG_LOCAL="$my_tmp/${GOLANG_PRE}.tar.gz"
+GOLANG_UNTAR="$my_tmp/${GOLANG_PRE}"
+
+if [ -n "$(command -v curl 2>/dev/null | grep curl)" ]; then
+  curl -fSL ${GOLANG_REMOTE} -o ${GOLANG_LOCAL} || echo 'error downloading golang'
+elif [ -n "$(command -v wget 2>/dev/null | grep wget)" ]; then
+  wget ${GOLANG_REMOTE} -O ${GOLANG_LOCAL} || echo 'error downloading golang'
+else
+  echo "'wget' and 'curl' are missing. Please run the following command and try again"
+  echo "    sudo apt-get install --yes curl wget"
+  exit 1
+fi
+
+mkdir -p ${GOLANG_UNTAR}/
+# --strip-components isn't portable, switch to portable version by performing move step after untar
+tar xf ${GOLANG_LOCAL} -C ${GOLANG_UNTAR}/ #--strip-components=1
+mv ${GOLANG_UNTAR}/go/* ${GOLANG_UNTAR}/
+rm -rf ${GOLANG_UNTAR}/go # clean up the temporary unzip folder
+if [ -n "$(command -v rsync 2>/dev/null | grep rsync)" ]; then
+  echo $sudo_cmd rsync -Krl "${GOLANG_UNTAR}/" "$golang_install_path/"
+  rsync -Krl "${GOLANG_UNTAR}/" "$golang_install_path/" 2>/dev/null || $sudo_cmd rsync -Krl "${GOLANG_UNTAR}/" "$golang_install_path/"
+else
+  echo $sudo_cmd cp -Hr "${GOLANG_UNTAR}/*" "$golang_install_path/"
+  cp -Hr "${GOLANG_UNTAR}"/* "$golang_install_path/" 2>/dev/null || $sudo_cmd cp -Hr "${GOLANG_UNTAR}"/* "$golang_install_path/"
+fi
+rm -rf "${GOLANG_UNTAR}"
+
+#######
+# END #
+#######
+
+# TODO add more than one at a time
+pathman add $golang_install_path/bin
+mkdir -p $HOME/go/bin
+pathman add $HOME/go/bin
+echo "go get golang.org/x/tools/cmd/goimports"
+$golang_install_path/bin/go get golang.org/x/tools/cmd/goimports > /dev/null 2>/dev/null