Add generate-motd script

LaunchAgents/eryn.dotfiles.generate-motd.plist

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+  <dict>
+    <key>Label</key>
+    <string>eryn.dotfiles.generate-motd</string>
+    <key>ProgramArguments</key>
+    <array>
+        <string>zsh</string>
+        <string>-c</string>
+        <string>~/bin/generate-motd</string>
+    </array>
+    <key>EnvironmentVariables</key>
+    <dict>
+      <key>PATH</key>
+      <string>/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/opt/homebrew/bin</string>
+    </dict>
+    <key>RunOnDemand</key>
+    <true/>
+  </dict>
+</plist>

bin/generate-motd

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+#!/bin/zsh
+# Eryn Wells <eryn@erynwells.me>
+
+MOTD_FILE=/etc/motd
+
+binary_exists() {
+    hash $1 1>/dev/null 2>&1
+    return $?
+}
+
+if [[ ! -w "$MOTD_FILE" ]]; then
+    echo "$MOTD_FILE is not wrtiable by $USER" >&2
+    exit 1
+fi
+
+# If lolcat is installed, dump a colorful message to the MOTD file. :)
+local cat_program=cat
+local cat_args=''
+if binary_exists lolcat; then
+    echo "Enabling rainbows"
+    cat_program=lolcat
+    cat_args=-f
+fi
+
+local hello_message="\nThis machine is called `hostname`.\n"
+
+local hardware_model=`sysctl -n hw.model`
+
+if [[ -n "$hardware_model" ]]; then
+    hello_message+="It’s a $hardware_model "
+fi
+
+local os_version=`sysctl -n kern.osproductversion`
+local product_name=`sw_vers --productName`
+local os_build=`sw_vers --buildVersion`
+
+if [[ -n "$os_version" && -n "$os_build" ]]; then
+    hello_message+="running $product_name $os_version ($os_build)."
+elif [[ -n "$os_version" ]]; then
+    hello_message+="running $product_name $os_version."
+fi
+
+hello_message+="\n"
+
+echo "Writing MOTD"
+print -P $hello_message | $cat_program $cat_args > $MOTD_FILE