Add ssh-sign function

.config/zsh/.zshenv

@@ -1 +1,2 @@
 [[ -d "${ZDOTDIR}"/functions ]] && fpath+=( "${ZDOTDIR}"/functions )
+[[ -d "${ZDOTDIR}"/completions ]] && fpath+=( "${ZDOTDIR}"/completions )

.config/zsh/completions/_ssh-sign

@@ -0,0 +1,9 @@
+#compdef ssh-sign
+
+_arguments '-f[keyfile]:filename:_files' '-n[namespace]:namespace:_ssh-sign_namespaces' '*:file:_files'
+
+function _ssh-sign_namespaces()
+{
+    local -a namespaces=(file email git "@$(dnsdomainname)")
+    _values "namespace" ${namespaces}
+}

.config/zsh/functions/ssh-sign

@@ -0,0 +1,14 @@
+#!/usr/bin/env zsh
+# Sign files with SSH
+
+setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL
+
+autoload -U die
+[[ ${ARGC} -eq 0 ]] && die 1 "Usage: ${0} [-f KEYFILE] [-n NAMESPACE] <file> …"
+
+zmodload zsh/zutil
+local -a keyfile=(-f ~/.ssh/id_ed25519)
+local -a namespace=(-n file)
+zparseopts -D -K -- f:=keyfile n:=namespace
+
+ssh-keygen -Y sign -f ${keyfile[2]} -n ${namespace[2]} ${@}