added zigup-init script

zigup-init.sh

@@ -0,0 +1,181 @@
+#!/bin/sh
+
+ZIGUP_UPDATE_ROOT="https://github.com/marler8997/zigup/releases/latest/download"
+ZIGUP_DIR="${HOME}/.zigup"
+
+main() {
+    downloader --check
+    need_cmd uname
+    need_cmd unzip
+    need_cmd wget
+    need_cmd mkdir
+    get_architecture || return 1
+    local _arch="$RETVAL"
+    local _artifact="zigup.${_arch}.zip"
+    local _url="${ZIGUP_UPDATE_ROOT}/${_artifact}"
+
+    say "downloading installer"
+
+    ensure mkdir -p $ZIGUP_DIR/bin
+    ensure downloader $_url $ZIGUP_DIR/$_artifact
+    ensure unzip -q -u $ZIGUP_DIR/$_artifact -d $ZIGUP_DIR/bin
+    ensure chmod u+x $ZIGUP_DIR/bin/zigup
+    ensure rm $ZIGUP_DIR/$_artifact
+
+    setup_env
+    post_install_info
+}
+
+post_install_info() {
+    printf '%s' "
+Welcome to Zig!
+
+Zigup will be installed into the Zigup home directory located at:
+
+  ${HOME}/.zigup/bin
+
+To specify install directory for the compilers
+
+  alias zigup=\"zigup --install-dir ${HOME}/.zigup/compilers\"
+
+This path will be added to your PATH environment variable and
+this alias will be invoked by modifying the following files
+
+  ${HOME}/.profile"
+
+    if check_cmd zsh; then
+        printf '%s' "
+  ${HOME}/.zshenv
+"
+    fi
+}
+
+setup_env() {
+    local _envurl="https://raw.githubusercontent.com/FabricatorZayac/zigup-init/main/env"
+    local _envstr='. "$HOME/.zigup/env"'
+
+    ensure downloader $_envurl $ZIGUP_DIR/env
+
+    if ! grep -Fxq "$_envstr" $HOME/.profile; then
+        printf '%s\n' "$_envstr" >> $HOME/.profile
+    fi
+    if check_cmd zsh; then
+        if ! grep -Fxq "$_envstr" $HOME/.zshenv; then
+            printf '%s\n' "$_envstr" >> $HOME/.zshenv
+        fi
+    fi
+}
+
+downloader() {
+    local _dld
+    local _status
+    local _err
+    if check_cmd curl; then
+        _dld=curl
+    elif check_cmd wget; then
+        _dld=wget
+    else
+        _dld='curl or wget' # to be used in error message of need_cmd
+    fi
+
+    if [ "$1" = --check ]; then
+        need_cmd "$_dld"
+    elif [ "$_dld" = curl ]; then
+        _err=$(curl $_retry --proto '=https' --silent --show-error --fail --location "$1" --output "$2" 2>&1)
+        _status=$?
+
+        if [ -n "$_err" ]; then
+            echo "$_err" >&2
+            if echo "$_err" | grep -q 404$; then
+                err "installer not found"
+            fi
+        fi
+        return $_status
+    elif [ "$_dld" = wget ]; then
+        _err=$(wget --https-only --secure-protocol=TLSv1_2 "$1" -O "$2" 2>&1)
+        _status=$?
+        if [ -n "$_err" ]; then
+            echo "$_err" >&2
+            if echo "$_err" | grep -q ' 404 Not Found$'; then
+                err "installer not found"
+            fi
+        fi
+        return $_status
+    fi
+}
+
+say() {
+    printf 'zigup: %s\n' "$1"
+}
+
+err() {
+    say "$1" >&2
+    exit 1
+}
+
+# Run a command that should never fail. If the command fails execution
+# will immediately terminate with an error showing the failing
+# command.
+ensure() {
+    if ! "$@"; then err "command failed: $*"; fi
+}
+
+need_cmd() {
+    if ! check_cmd "$1"; then
+        err "need '$1' (command not found)"
+    fi
+}
+
+check_cmd() {
+    command -v "$1" > /dev/null 2>&1
+}
+
+get_architecture() {
+    local _ostype _cputype _bitness _arch
+    _ostype="$(uname -s)"
+    _cputype="$(uname -m)"
+
+    if [ "$_ostype" = Darwin ] && [ "$_cputype" = i386 ]; then
+        # Darwin `uname -m` lies
+        if sysctl hw.optional.x86_64 | grep -q ': 1'; then
+            _cputype=x86_64
+        fi
+    fi
+
+    case "$_ostype" in
+
+        Linux)
+            _ostype=ubuntu
+            ;;
+
+        Darwin)
+            _ostype=macos
+            ;;
+
+        *)
+            err "unrecognized OS type: $_ostype"
+            ;;
+
+    esac
+
+    case "$_cputype" in
+
+        aarch64 | arm64)
+            _cputype=aarch64
+            ;;
+
+        x86_64 | x86-64 | x64 | amd64)
+            _cputype=x86_64
+            ;;
+
+        *)
+            err "unknown CPU type: $_cputype"
+
+    esac
+
+    _arch="${_ostype}-latest-${_cputype}"
+
+    RETVAL="$_arch"
+}
+
+main "$@" || exit 1