CHTSH_CONF specifies location of cht.sh.conf (fixes chubin#59)

Author: chubin

README.md

@@ -284,7 +284,8 @@ Type `help` for other internal `cht.sh` commands.
 				  cht.sh/go> /python zip list
 ```
 
-The `cht.sh` client has its configuration file which is located at `~/.cht.sh/cht.sh.conf`.
+The `cht.sh` client has its configuration file which is located at `~/.cht.sh/cht.sh.conf`
+(location of the file can be overriden by the environment variable `CHTSH_CONF`).
 Use it to specify query options that you would use with each query.
 For example, to switch syntax highlighting off create the file with the following
 content:

share/cht.sh.txt

@@ -133,9 +133,13 @@ gen_random_str()
   fi
 )
 
-if [ -e "$HOME"/.cht.sh/cht.sh.conf ]; then
+if [ -z "$CHTSH_CONF" ]; then
+  CHTSH_CONF="$HOME"/.cht.sh/cht.sh.conf
+fi
+
+if [ -e "$CHTSH_CONF" ]; then
   # shellcheck disable=SC1090,SC2002
-  . "$HOME"/.cht.sh/cht.sh.conf
+  . "$CHTSH_CONF"
 fi
 
 if [ "$1" = --read ]; then