update readme

README.md

@@ -1,20 +1,70 @@
 # strans
-  CJK input method
 
-## Switch Key
+An input method daemon for CJK text entry on X11.
-| Key | Action |
+
-|-----|--------|
+Inspired by 9front's ktrans. Threads communicate via CSP channels.
-| Ctrl+N | Hiragana |
-| Ctrl+K | Katakana |
-| Ctrl+S | Hangul |
-| Ctrl+T | English |
-| Ctrl+V | Vietnam |
-| Ctrl+E | Emoji(☺,λ,ε) |
 
 ## Dependencies
-- plan9port
-- libxcb
 
-## Reference
+- plan9port
+- gtk+-3.0 (optional, for GTK IM module)
+
+## Build
+
+	make
+	cd xim && make                          # XIM adapter
+	cd gtk && make docker && make install   # GTK IM module
+
+## Run
+
+	./strans map font &
+
+For XIM apps:
+
+	./xim/strans-xim &
+	XMODIFIERS=@im=strans xterm
+
+For GTK apps:
+
+	GTK_IM_MODULE=strans gedit
+
+## Usage
+
+Switch input modes with Ctrl + key:
+
+	N  Hiragana
+	K  Katakana
+	S  Hangul
+	T  English
+	V  Vietnamese (Telex)
+	E  Emoji
+
+Type romanized input. Select candidates with 1-9 or arrow keys.
+Tab or Enter to commit.
+
+## Architecture
+
+Four threads communicate via CSP channels:
+
+- [imthread](strans.c#L271): keystroke processing, transliteration
+- [dictthread](dict.c#L38): dictionary lookup
+- [drawthread](win.c#L133): preedit window rendering
+- [srvthread](srv.c#L42): IPC via unix socket
+
+Adapters (strans-xim, im-strans.so) bridge X11/GTK events.
+
+## Files
+
+	strans.c    input method engine
+	dict.c      dictionary queries
+	win.c       xcb window management
+	font.c      truetype rendering (stb_truetype)
+	map/        transliteration tables
+	font/       bundled CJK fonts
+
+## References
+
 - https://git.9front.org/plan9front/plan9front/HEAD/info.html
 - https://np.mkv.li/kor/9front-ktrans-%ED%95%9C%EA%B8%80-%EB%98%91%EB%B0%94%EB%A1%9C-%EB%A7%8C%EB%93%A4%EA%B8%B0/
+- https://en.wikipedia.org/wiki/Telex_(input_method)
+- https://gist.github.com/hieuthi/0f5adb7d3f79e7fb67e0e499004bf558