[hexxy] update readme

README.md

@@ -5,17 +5,71 @@
 
 ![example of hexxy in action](assets/img.png)
 
-## Example usage
+## Quick install
+requirements: Go 1.20+ (it may build with earlier versions as well but I have not tested them) and git
+
 ```sh
+git clone https://github.com/sweetbbak/hexxy && cd hexxy
+go build
+```
+
+## Example usage
+
+```sh
+# normal usage
 hexxy /path/to/file.bin
-# dont output with color
+
+# output without color
 hexxy --no-color /path/to/file.bin
-# dump multiple files
-hexxy file1 file2 file3
+
 # read from stdin
 cat mybinary | hexxy
+
+# display plain output
+hexxy -p file.bin
+
+# Include a binary as a C variable
+hexxy -i input-file > output.c
+
+# Use plain non-formatted output
+hexxy -p input-file
+
+# crunch empty lines with a '*' and use uppercase HEX
+hexxy -a --upper input-file
+
+# Reverse plain non-formatted output (reverse plain)
+hexxy -rp input-file
+
+# Show output with a space in between N groups of bytes
+hexxy -g1 input-file ... -> outputs: 00000000: 0f 1a ff ff 00 aa
+
 # display offset in Decimal format
 hexxy -td file.bin
+
 # display offset in Octal format
 hexxy -to file.bin
 ```
+
+## Performance
+
+`zk` is a 17mb binary
+
+```sh
+xxd -i ~/bin/zk &> /dev/null  0.66s user 0.02s system 99% cpu 0.677 total
+hexxy -i ~/bin/zk &> /dev/null  0.16s user 0.01s system 98% cpu 0.165 total
+```
+
+```sh
+# plain XXD
+xxd ~/bin/zk &> /dev/null  0.12s user 0.01s system 99% cpu 0.126 total
+
+# hexxy without color
+hexxy -N ~/bin/zk &> /dev/null  0.21s user 0.01s system 100% cpu 0.223 total
+
+# hexxy with color
+hexxy ~/bin/zk &> /dev/null  0.37s user 0.01s system 99% cpu 0.383 total
+```
+
+## Credits
+thanks to [felixge](https://github.com/felixge/go-xxd) for showing how this is done quickly
+thanks to [igoracmelo](https://github.com/igoracmelo/xx) for the idea to colorize hexdump output with a gradient