[Fix #425] Rewrite module ssh-agent; rename it to ssh

modules/ssh/README.md

@@ -0,0 +1,28 @@
+SSH
+===
+
+Provides for an easier use of [SSH][1] by setting up [ssh-agent][2].
+
+This module is disabled on Mac OS X due to custom Apple SSH support rendering it
+unnecessary.
+
+Settings
+--------
+
+### Identities
+
+To load multiple identities, add the following line to *zpreztorc*:
+
+    zstyle ':prezto:module:ssh:load' identities 'id_rsa' 'id_dsa' 'id_github'
+
+Authors
+-------
+
+*The authors of this module should be contacted via the [issue tracker][3].*
+
+  - [Sorin Ionescu](https://github.com/sorin-ionescu)
+
+[1]: http://www.openssh.com
+[2]: http://www.openbsd.org/cgi-bin/man.cgi?query=ssh-agent&sektion=1
+[3]: https://github.com/sorin-ionescu/prezto/issues
+

modules/ssh/init.zsh

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+#
+# Provides for an easier use of SSH by setting up ssh-agent.
+#
+# Authors:
+#   Sorin Ionescu <sorin.ionescu@gmail.com>
+#
+
+# Return if requirements are not found.
+if [[ "$OSTYPE" == darwin* ]] || (( ! $+commands[ssh-agent] )); then
+  return 1
+fi
+
+# Set the path to the SSH directory.
+_ssh_dir="$HOME/.ssh"
+
+# Set the path to the environment file if not set by another module.
+_ssh_agent_env="${_ssh_agent_env:-$TMPDIR/ssh-agent.env}"
+
+# Set the path to the persistent authentication socket.
+_ssh_agent_sock="$TMPDIR/ssh-agent.sock"
+
+# Start ssh-agent if not started.
+if [[ ! -S "$SSH_AUTH_SOCK" ]]; then
+  eval "$(ssh-agent | sed '/^echo /d' | tee "$_ssh_agent_env")"
+else
+  # Export environment variables.
+  source "$_ssh_agent_env" 2> /dev/null
+fi
+
+# Load identities.
+if ssh-add -l 2>&1 | grep 'The agent has no identities'; then
+  zstyle -a ':prezto:module:ssh:load' identities '_ssh_identities'
+  if (( ${#identities} > 0 )); then
+    ssh-add "$_ssh_dir/${^_ssh_identities[@]}"
+  else
+    ssh-add
+  fi
+fi
+
+# Create a persistent SSH authentication socket.
+if [[ -S "$SSH_AUTH_SOCK" && "$SSH_AUTH_SOCK" != "$_ssh_agent_sock" ]]; then
+  ln -sf "$SSH_AUTH_SOCK" "$_ssh_agent_sock"
+  export SSH_AUTH_SOCK="$_ssh_agent_sock"
+fi
+
+# Clean up.
+unset _ssh_{dir,identities} _ssh_agent_{env,sock}
+