add documentation for gz/bz2/xz

helpers/utils

@@ -97,18 +97,22 @@ fi
 # ```text
 # format    = "tar.gz"/xz/bz2    # automatically guessed from the extension of the URL, but can be set explicitly. Will use `tar` to extract
 #             "zip"              # automatically guessed from the extension of the URL, but can be set explicitly. Will use `unzip` to extract
+#             "gz"               # automatically guessed from the extension of the URL, but can be set explicitly. Will use `gunzip` to extract
+#             "bz2"              # automatically guessed from the extension of the URL, but can be set explicitly. Will use `bunzip2` to extract
+#             "xz"               # automatically guessed from the extension of the URL, but can be set explicitly. Will use `xz -d` to extract
 #             "docker"           # useful to extract files from an already-built docker image (instead of rebuilding them locally). Will use `docker-image-extract` to extract
 #             "whatever"         # an arbitrary value, not really meaningful except to imply that the file won't be extracted
 #
 # in_subdir = true    # default, there's an intermediate subdir in the archive before accessing the actual files
 #             false   # sources are directly in the archive root
 #             n       # (special cases) an integer representing a number of subdirs levels to get rid of
 #
-# extract   = true    # default if file is indeed an archive such as .zip, .tar.gz, .tar.bz2, ...
+# extract   = true    # default if file is indeed an archive such as .zip, .tar.gz, .tar.bz2, gz, ...
 #           = false   # default if file 'format' is not set and the file is not to be extracted because it is not an archive but a script or binary or whatever asset.
 #                     #    in which case the file will only be `mv`ed to the location possibly renamed using the `rename` value
 #
 # rename    = "whatever_your_want"   # to be used for convenience when `extract` is false and the default name of the file is not practical
+#                                    # also used for single file archives (gz, bz2, xz) to rename the extracted file (default : the source id, or the app name for main source)
 # platform  = "linux/amd64"          # (defaults to "linux/$YNH_ARCH") to be used in conjonction with `format = "docker"` to specify which architecture to extract for
 # ```
 #