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(import [configparser [ConfigParser]])
(import [os [getenv makedirs]])
(import [os.path [dirname expanduser]])
(import [sys [argv exit stderr]])
(import [re [match]])
(import [nntplib [NNTP-SSL]])
(import [subprocess [Popen PIPE]])
(require [hy.contrib.walk [let]])
(setv *auth-source* (expanduser "~/.authinfo.gpg"))
(setv *config-path* (expanduser "~/.config/brisket/config.ini"))
(setv *recognized-commands* ["describe-group"
"help"
"list-group"
"list-groups"])
(defn help [&rest args]
"Display the documentation for a command to stdout."
(unless (= (len args) 1)
(err (.format "usage: help [command]"))
(return))
(let [command (first args)]
(unless (in command *recognized-commands*)
(err (.format "unrecognized command: {}" command))
(exit 1))
(let [handler (get (globals) (.replace command "-" "_"))]
(print (. handler __doc__)))))
(defn list-groups [session &rest args]
"List groups on the server, matching a pattern if one is given.
usage: list-groups [pattern (optional)]"
(let [pattern (if (>= (len args) 1) (nth args 0))
groups (second (.list session))]
(for [group groups]
(if (or (is pattern None) (match pattern group.group))
(print group.group)))))
(defn make-config []
"Create a default configuration file.
Creates the configuration directory if it does not exist, as well as an INI file
populated with default configuration values."
(let [config (ConfigParser)]
(assoc config "Server" {})
(assoc (get config "Server") "Host" "news.eternal-september.org")
(makedirs (dirname *config-path*))
(with [out (open *config-path* "w+")]
(.write config out))
config))
(defn load-config []
"Load the configuration file for Brisket.
Returns a default configuration, written to `*config-path*`, if a configuration
file cannot be found."
(let [config (ConfigParser)]
(if (= 1 (len (.read config *config-path*)))
config
(make-config))))
(defn find-host [config]
"Returns the host that Brisket should connect to.
The lookup order is:
- NNTPSERVER environment variable.
- 'Host' in the 'Server' section of the configuration file."
(or (getenv "NNTPSERVER")
(if (and (in "Server" config)
(in "Host" (get config "Server")))
(get (get config "Server") "Host"))))
(defn get-user-info [host]
"Decode *auth-source* and return the line containing HOST."
(let [process (Popen ["gpg" "-q" "-d" *auth-source*] :stdout PIPE)
output (.decode (first (.communicate process)))]
(for [line (.split output "\n")]
(when (.startswith line (.format "machine {}" host))
(return line)))))
(defn get-username [host]
"Return the username for HOST as specified by *auth-source*."
(let [info (get-user-info host)
start-index (.find info "login")]
(unless (= -1 start-index)
(let [sliced (.split (.join "" (drop start-index info)))]
(if (> (len sliced) 1)
(.strip (nth sliced 1) "\""))))))
(defn get-password [host]
"Return the password for HOST as specified by *auth-source*."
(let [info (get-user-info host)
start-index (.find info "password")]
(unless (= -1 start-index)
(let [sliced (.split (.join "" (drop start-index info)))]
(if (> (len sliced) 1)
(.strip (nth sliced 1) "\""))))))
(defn err [&rest args]
"Displays ARGS to stderr."
(.write stderr (+ (first args) "\n") #* (rest args)))
(when (= __name__ "__main__")
(unless (>= (len argv) 2)
(err (.format "usage: {} [command] [args]" (first argv)))
(err "recognized commands:")
(for [command *recognized-commands*]
(err (.format " - {}" command)))
(exit 1))
(let [config (load-config)
host (find-host config)
command (nth argv 1)]
(when (is host None)
(err (.format "no host specified"))
(exit 1))
(unless (in command *recognized-commands*)
(err (.format "unrecognized command: {}" command))
(exit 1))
;; Special case for 'help', as it's the one command that doesn't require a
;; connection to the NNTP server.
(if (= command "help")
(help #* (drop 2 argv))
(let [user (get-username host)
password (get-password host)]
(with [session (NNTP_SSL host :user user :password password)]
;; Otherwise, pull the function out of the global namespace.
(let [handler (get (globals) (.replace command "-" "_"))]
(handler session #* (drop 2 argv))))))))
;; # To-be-converted Python
;;
;; def describe_group(n, *args):
;; if len(args) < 1:
;; err("usage: describe-group [group]")
;; return
;;
;; _, descs = n.descriptions(args[0])
;;
;; for desc in descs:
;; print(desc)
;;
;; def list_group(n, *args):
;; if len(args) < 1:
;; err("usage: list-group [group]")
;; return
;;
;; _, _, first, last, _ = n.group(args[0])
;; _, overviews = n.over((first, last))
;;
;; for article_num, overview in overviews:
;; print("\"{}\" by {} on {}".format(
;; overview.get("subject"),
;; overview.get("from"),
;; overview.get("date"),
;; ))
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