commit fc353daf52d2676d6f45b4f076f39703a3c2ad30
Author: Dimitri Lozeve <dimitri@lozeve.com>
Date:   Thu Sep 8 21:01:55 2022 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5ab4ce9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*\~
+sncf
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..c1ca911
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,6 @@
+FROM gerbil/alpine
+
+RUN gxpkg install github.com/dlozeve/fancy
+
+COPY sncf.ss .
+RUN gxc -exe -static -cc-options -static -ld-options -lz -o sncf sncf.ss
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..baf7d86
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -eux
+
+docker build . -t dlozeve/sncf
+CONTAINER_ID=$(docker run -d dlozeve/sncf)
+docker cp "$CONTAINER_ID":/src/sncf .
+docker rm -f "$CONTAINER_ID"
diff --git a/sncf.ss b/sncf.ss
new file mode 100755
index 0000000..ccc95b7
--- /dev/null
+++ b/sncf.ss
@@ -0,0 +1,99 @@
+#!/usr/bin/env gxi
+
+(export main)
+
+(import :std/format
+	:std/getopt
+	:std/iter
+	:std/net/request
+	:std/srfi/19
+	:std/sugar
+	:std/text/json
+	:dlozeve/fancy/table)
+
+(def +sncf-url+ "https://api.sncf.com/v1/coverage/sncf/stop_areas/stop_area:SNCF:87415604/departures")
+
+(def (main . args)
+  (def gopt (getopt (argument 'sncf-key help: "SNCF API authentication key.")
+		    (option 'mattermost-url "--mattermost-url" help: "Mattermost incoming webhook URL.")
+		    (option 'mattermost-channel "--channel" help: "Mattermost channel.")))
+  (try
+   (let* ((options (getopt-parse gopt args))
+	  (sncf-key (hash-ref options 'sncf-key))
+	  (mattermost-url (hash-ref options 'mattermost-url))
+	  (mattermost-channel (hash-ref options 'mattermost-channel))
+	  (departures (get-next-departures sncf-key)))
+     (display-departures-table departures)
+     (def tab-str-md
+       (with-output-to-string (lambda () (display-departures-table-md departures))))
+     (if mattermost-url
+       (post-to-mattermost mattermost-url tab-str-md channel: mattermost-channel)))
+   (catch (getopt-error? exn)
+     (getopt-display-help exn "sncf" (current-error-port))
+     (exit 1))
+   (catch (exn)
+     (display (error-message exn) (current-error-port))
+     (exit 1))))
+
+(def (get-next-departures sncf-key)
+  (def req (http-get +sncf-url+ headers: `(("Authorization" . ,sncf-key))))
+  (if (eq? 200 (request-status req))
+    (hash-ref (request-json req) 'departures)
+    (begin (display (format "Failed to query the SNCF API: ~a ~a\n"
+			    (request-status req) (request-status-text req)))
+	   (exit 1))))
+
+(def (display-departures-table departures)
+  (def tab (table '("Réseau" "Direction" "Heure") [10 30 13]))
+  (display (table-header tab))
+  (for ((dep departures))
+    (let* ((info (hash-ref dep (string->symbol "display_informations")))
+	   (stop-dt (hash-ref dep (string->symbol "stop_date_time")))
+	   (base-dep-dt-str (hash-ref stop-dt (string->symbol "base_departure_date_time")))
+	   (base-dep-dt (string->date base-dep-dt-str "~Y~m~dT~H~M~S"))
+	   (dep-dt-str (hash-ref stop-dt (string->symbol "departure_date_time")))
+	   (dep-dt (string->date dep-dt-str "~Y~m~dT~H~M~S"))
+	   (hour-str (if (equal? dep-dt base-dep-dt)
+		       (date->string dep-dt "~H:~M")
+		       (format "~a → ~a"
+			       (date->string base-dep-dt "~H:~M")
+			       (date->string dep-dt "~H:~M")))))
+      (display (table-row tab
+			  (hash-ref info 'network)
+			  (hash-ref info 'direction)
+			  hour-str))))
+  (display (table-footer tab)))
+
+(def (display-departures-table-md departures)
+  (displayln "| Réseau | Direction | Heure |")
+  (displayln "|-")
+  (for ((dep departures))
+    (let* ((info (hash-ref dep (string->symbol "display_informations")))
+	   (stop-dt (hash-ref dep (string->symbol "stop_date_time")))
+	   (base-dep-dt-str (hash-ref stop-dt (string->symbol "base_departure_date_time")))
+	   (base-dep-dt (string->date base-dep-dt-str "~Y~m~dT~H~M~S"))
+	   (dep-dt-str (hash-ref stop-dt (string->symbol "departure_date_time")))
+	   (dep-dt (string->date dep-dt-str "~Y~m~dT~H~M~S"))
+	   (hour-str (if (equal? dep-dt base-dep-dt)
+		       (date->string dep-dt ":white_check_mark: ~H:~M")
+		       (format ":warning: ~a → ~a"
+			       (date->string base-dep-dt "~H:~M")
+			       (date->string dep-dt "~H:~M")))))
+      (displayln (format "| ~a | ~a | ~a |"
+		       (hash-ref info 'network)
+		       (hash-ref info 'direction)
+		       hour-str)))))
+
+(def (post-to-mattermost url text channel: (channel #f))
+  (def data (list->hash-table `((text . ,text))))
+  (when channel
+    (hash-put! data 'channel channel))
+  (def mattermost-headers '(("Content-Type" . "application/json")))
+  (def req (http-post url
+		      headers: mattermost-headers
+		      data: (json-object->string data)))
+  (if (eq? 200 (request-status req))
+    (display (format "Sent to Mattermost in ~a\n" (if channel channel "default channel")))
+    (begin (display (format "Failed to send the message to Mattermost: ~a ~a\n"
+			    (request-status req) (request-status-text req)))
+	   (exit 1))))