spm

Be more compatible with pass(1)

By reading the gpg-id file as well. However, pass(1) supports multiple
gpg-id files maybe we should consider reading all of them.

To increase compatibility further we could also use the same
environment variable names as pass(1):

TPM_STORE_DIR -> PASSWORD_STORE_DIR
TPM_STORE_KEY -> PASSWORD_STORE_KEY

diff --git a/README.pod b/README.pod
@@ -34,9 +34,13 @@ GPG key to encrypt files with (default: self).
 
 =over 4
 
-=item ~/.password-store
+=item $TPM_STORE_DIR
 
-The default storage directory.
+The storage directory.
+
+=item $TPM_STORE_DIR/.gpg-id
+
+Provided for compatiblity with pass(1). Overwrites $TPM_STORE_KEY.
 
 =back
 

diff --git a/tpm b/tpm
@@ -9,6 +9,10 @@ umask 077
 GPG_OPTS="--quiet --yes --batch"
 STORE_DIR="${TPM_STORE_DIR:-${HOME}/.password-store}"
 
+if [[ -r "${STORE_DIR}/.gpg-id" ]]; then
+  read -r TPM_STORE_KEY < "${STORE_DIR}/.gpg-id"
+fi
+
 if [[ -z "${TPM_STORE_KEY}" ]]; then
   GPG_OPTS="${GPG_OPTS} --default-recipient-self"
 else