From e7fef765b16160cc4c7e6687bad29a9b4d6d005f Mon Sep 17 00:00:00 2001
From: AJ ONeal <aj@therootcompany.com>
Date: Wed, 9 Aug 2023 23:03:30 +0000
Subject: [PATCH] ref: make 'go' canonical installer, not just alias

---
 go/install.ps1 | 66 +++++++++++++++++++++++++++++++++++++++++++++++---
 go/install.sh  | 61 ++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 118 insertions(+), 9 deletions(-)

diff --git a/go/install.ps1 b/go/install.ps1
index 69046e9..0e3d1f2 100644
--- a/go/install.ps1
+++ b/go/install.ps1
@@ -1,5 +1,63 @@
-#!/bin/pwsh
+#!/usr/bin/env pwsh
 
-echo "'go@$Env:WEBI_TAG' is an alias for 'golang@$Env:WEBI_VERSION'"
-IF ($Env:WEBI_HOST -eq $null -or $Env:WEBI_HOST -eq "") { $Env:WEBI_HOST = "https://webinstall.dev" }
-curl.exe -fsSL "$Env:WEBI_HOST/golang@$Env:WEBI_VERSION" | powershell
+$pkg_cmd_name = "go"
+New-Item "$Env:USERPROFILE\Downloads\webi" -ItemType Directory -Force | out-null
+$pkg_download = "$Env:USERPROFILE\Downloads\webi\$Env:WEBI_PKG_FILE"
+
+$pkg_src = "$Env:USERPROFILE\.local\opt\$pkg_cmd_name-v$Env:WEBI_VERSION"
+
+$pkg_dst = "$Env:USERPROFILE\.local\opt\$pkg_cmd_name"
+$pkg_dst_cmd = "$pkg_dst\bin\$pkg_cmd_name"
+$pkg_dst_bin = "$pkg_dst\bin"
+
+if (!(Get-Command "git.exe" -ErrorAction SilentlyContinue))
+{
+    & "$Env:USERPROFILE\.local\bin\webi-pwsh.ps1" git
+    # because we need git.exe to be available to golang immediately
+    $Env:PATH = "$Env:USERPROFILE\.local\opt\git\cmd;$Env:PATH"
+}
+
+# Fetch archive
+IF (!(Test-Path -Path "$pkg_download"))
+{
+    echo "Downloading $Env:PKG_NAME from $Env:WEBI_PKG_URL to $pkg_download"
+    & curl.exe -A "$Env:WEBI_UA" -fsSL "$Env:WEBI_PKG_URL" -o "$pkg_download.part"
+    & move "$pkg_download.part" "$pkg_download"
+}
+
+IF (!(Test-Path -Path "$pkg_src"))
+{
+    echo "Installing $pkg_cmd_name"
+    # TODO: temp directory
+
+    # Enter opt
+    pushd .local\tmp
+
+        # Remove any leftover tmp cruft
+        Remove-Item -Path "$pkg_cmd_name*" -Recurse -ErrorAction Ignore
+
+        # Unpack archive
+        # Windows BSD-tar handles zip. Imagine that.
+        echo "Unpacking $pkg_download"
+        & tar xf "$pkg_download"
+
+        # Settle unpacked archive into place
+        echo "New Name: $pkg_cmd_name-v$Env:WEBI_VERSION"
+        Get-ChildItem "$pkg_cmd_name*" | Select -f 1 | Rename-Item -NewName "$pkg_cmd_name-v$Env:WEBI_VERSION"
+        echo "New Location: $pkg_src"
+        Move-Item -Path "$pkg_cmd_name-v$Env:WEBI_VERSION" -Destination "$Env:USERPROFILE\.local\opt"
+
+    # Exit tmp
+    popd
+}
+
+echo "Copying into '$pkg_dst' from '$pkg_src'"
+Remove-Item -Path "$pkg_dst" -Recurse -ErrorAction Ignore
+Copy-Item -Path "$pkg_src" -Destination "$pkg_dst" -Recurse
+IF (!(Test-Path -Path go\bin)) { New-Item -Path go\bin -ItemType Directory -Force | out-null }
+
+# Add to path
+webi_path_add ~/.local/opt/go/bin
+
+# Special to go: add default GOBIN to PATH
+webi_path_add ~/go/bin
diff --git a/go/install.sh b/go/install.sh
index 328b598..7c2ff23 100644
--- a/go/install.sh
+++ b/go/install.sh
@@ -2,10 +2,61 @@
 set -e
 set -u
 
-__redirect_alias_golang() {
-    echo "'go@${WEBI_TAG:-stable}' is an alias for 'golang@${WEBI_VERSION-}'"
-    WEBI_HOST=${WEBI_HOST:-"https://webinstall.dev"}
-    curl -fsSL "$WEBI_HOST/golang@${WEBI_VERSION-}" | sh
+GOBIN="${HOME}/go"
+GOBIN_REAL="${HOME}/.local/opt/go-bin-v${WEBI_VERSION}"
+
+# The package is 'golang', but the command is 'go'
+pkg_cmd_name="go"
+
+# NOTE: pkg_* variables can be defined here
+#       pkg_cmd_name
+#       pkg_src, pkg_src_bin, pkg_src_cmd
+#       pkg_dst, pkg_dst_bin, pkg_dst_cmd
+#
+# Their defaults are defined in _webi/template.sh at https://github.com/webinstall/packages
+
+pkg_get_current_version() {
+    # 'go version' has output in this format:
+    #       go version go1.14.2 darwin/amd64
+    # This trims it down to just the version number:
+    #       1.14.2
+    go version 2> /dev/null |
+        head -n 1 |
+        cut -d' ' -f3 |
+        sed 's:go::'
 }
 
-__redirect_alias_golang
+pkg_format_cmd_version() {
+    # 'go v1.14.0' will be 'go1.14'
+    my_version=$(echo "$1" | sed 's:\.0::g')
+    echo "${pkg_cmd_name}${my_version}"
+}
+
+pkg_link() {
+    # 'pkg_dst' will default to $HOME/.local/opt/go
+    # 'pkg_src' will be the installed version, such as to $HOME/.local/opt/go-v1.14.2
+    rm -rf "$pkg_dst"
+    ln -s "$pkg_src" "$pkg_dst"
+
+    # Go has a special $GOBIN
+
+    # 'GOBIN' is set above to "${HOME}/go"
+    # 'GOBIN_REAL' will be "${HOME}/.local/opt/go-bin-v${WEBI_VERSION}"
+    rm -rf "$GOBIN"
+    mkdir -p "$GOBIN_REAL/bin"
+    ln -s "$GOBIN_REAL" "$GOBIN"
+}
+
+pkg_post_install() {
+    pkg_link
+
+    # web_path_add is defined in _webi/template.sh at https://github.com/webinstall/packages
+    # Updates PATH with
+    #       "$HOME/.local/opt/go"
+    webi_path_add "$pkg_dst_bin"
+    webi_path_add "$GOBIN/bin"
+}
+
+pkg_done_message() {
+    echo "Installed 'go v$WEBI_VERSION' to ~/.local/opt/go"
+}