scripts: Improve nomie credentials options

Added option to input nomie api key either directly as an environment
variable, or to pass a command (also through env var) to nomie which it
will call to get the api key.

So, if you have e.g. pass as password manager running, you can just do
`NOMIE_API_KEY_CMD="pass show path/to/key/file"` and it will use the
returned credentials.

scripts/.config/sh/env.d/nomie-api-key.sh

@@ -0,0 +1 @@
+export NOMIE_API_KEY_CMD="pass show websites/nomie.app/apikey"

scripts/.local/bin/nomie

@@ -2,10 +2,45 @@
 # this script logs a new entry in nomie - https://nomie.app/ - an open source habit tracker and journaling app
 # It will very simply take the text input and pass it on.
 
+getapikey() {
+    if [ -n "$NOMIE_API_KEY_CMD" ]; then
+        # shellcheck disable=2005
+        echo "$($NOMIE_API_KEY_CMD)"
+    elif [ -n "$NOMIE_API_KEY" ]; then
+        echo "$NOMIE_API_KEY"
+    else
+        exit 1
+    fi
+}
+
 sendtonomie() {
-  req="{\"note\":\"$*\",\"api_key\":\"$(pass show websites/nomie.app/apikey)\"}"
+    apikey=$(getapikey)
+    if [ "$?" -eq 1 ]; then
+        echo "No api key found."
+        exit 1
+    fi
+    req="{\"note\":\"$*\",\"api_key\":\"$apikey\"}"
     echo "$req"
     curl -s -H "Content-Type: application/json" --compressed --data "$req" https://nomieapi.com/log
 }
 
+usage() {
+    printf """
+simple nomie logging script.
+
+usage: nomie \"note content to upload to nomie with #tags and +mentions\"
+
+Will upload the content passed in on to nomie, using your api key.
+Set you api key through the \"NOMIE_API_KEY=<my-api-key-here>\" env var,
+or set a function to return the api key from \"NOMIE_API_KEY_CMD=<my-cmd>\" which will
+be used preferentially.
+    """
+}
+
+# print super basic help
+if [ "$1" = "-h" ] || [ "$1" = "--help" ] || [ "$#" -eq 0 ]; then
+    usage
+    exit 0
+fi
+
 sendtonomie "$@"