1 files changed, 76 insertions, 0 deletions

diff --git a/src/boxes/handlekeys.h b/src/boxes/handlekeys.h
new file mode 100644
index 0000000..868183f
--- /dev/null
+++ b/src/boxes/handlekeys.h
@@ -0,0 +1,76 @@
+/* handlekeys.h - Generic terminal input handler.
+ *
+ * Copyright 2012 David Seikel <won_fang@yahoo.com.au>
+ */
+
+enum keyeventtype{
+  HK_CSI,
+  HK_KEYS,
+  HK_MOUSE,
+  HK_RAW
+};
+
+struct keyevent {
+  enum keyeventtype type;       // The type of this event.
+  char *sequence;               // Either a translated sequence, or raw bytes.
+  int isTranslated;             // Whether or not sequence is translated.
+  int count;                    // Number of entries in params.
+  int *params;                  // For CSI events, the decoded parameters.
+};
+
+/* An input loop that handles keystrokes and terminal CSI commands.
+ *
+ * Reads stdin, trying to translate raw keystrokes into something more readable.
+ * See the keys[] array at the top of handlekeys.c for what byte sequences get
+ * translated into what key names.  See dumbsh.c for an example of usage.
+ * A 0.1 second delay is used to detect the Esc key being pressed, and not Esc
+ * being part of a raw keystroke.
+ *
+ * handle_keys also tries to decode CSI commands that terminals can send.
+ * Some keystrokes are CSI commands, but those are translated as key sequences
+ * instead of CSI commands.
+ *
+ * handle_keys also sets up a SIGWINCH handler to catch terminal resizes,
+ * and sends a request to the terminal to report it's current size when it gets
+ * a SIGWINCH.  This is the main reason for HK_CSI, as those reports are
+ * sent as CSI.  It's still up to the user code to recognise and deal with the
+ * terminal resize response, but at least it's nicely decoded for you.
+ *
+ * Arguments -
+ *  extra           - arbitrary data that gets passed back to the callbacks.
+ *  handle_event    - a callback to handle sequences.
+ *
+ * handle_event is called when a complete sequence has been accumulated.  It is
+ * passed a keyevent structure.  The type member of that structure determines
+ * what sort of event this is.  What's in the rest of the keyevent depends on
+ * the type -
+ *
+ * HK_CSI
+ *   sequence is the fully decoded CSI command, including the private  and intermediate characters.
+ *   isTranslated is 1, since the CSI command has been translated.
+ *   count is the count of translated CSI parameters.
+ *   params is an array of translateted CSI parameters.
+ *   Empty parameters are set to -1, coz -1 parameters are not legal,
+ *   and empty ones should default to something that is command dependant.
+ *
+ * HK_KEYS
+ *  sequence the keystrokes as ASCII, either translated or not.
+ *  isTranslated if 0, then sequence is ordinary keys, otherwise
+ *  sequence is the names of keys, from the keys[] array.
+ *  count and params are not used.
+ *
+ * For HK_KEYS handle_event should return 1 if the sequence has been dealt with,
+ * or ignored.  It should return 0, if handle_keys should keep adding more
+ * translated keystroke sequences on the end, and try again later.
+ * 0 should really only be used if it's a partial match, and we need more
+ * keys in the sequence to make a full match.
+ *
+ * HK_MOUSE
+ *   sequence is the raw bytes of the mouse report.  The rest are not used.
+ *
+ */
+void handle_keys(long extra, int (*handle_event)(long extra, struct keyevent *event));
+
+
+/* Call this when you want handle_keys to return. */
+void handle_keys_quit();