General TC > Programming & Scripting - Unofficial

in a script, could I have the main body folowed by its functions at the botom?

<< < (2/3) > >>

Rich:
Hi GNUser
Well done, thank you.  :)

GNUser:
Hi Rich. You're welcome. It's rare that the help flows in that direction :)

Hi nick65go. You're welcome. Glad I could help. Actually, here's a better example of CustomGreeting.sh that shows what's going on a bit more clearly:


--- Code: ---#!/bin/sh

main()
{
say_hi "$1"
say_bye "$2"
}

say_hi()
{
echo "hi $1"
}

say_bye()
{
echo "bye $1"
}

main "$@"

--- End code ---


--- Code: ---$ ./CustomGreeting.sh "John" "Mr. John Doe"
hi John
bye Mr. John Doe
--- End code ---
Happy Hacking!

mocore:
 

--- Code: ---#!/bin/sh

main()
{
say_hi "$1"
say_bye "$2"
}

say_hi()
{
echo "hi $1"
}

say_bye()
{
echo "bye $1"
}

 for argx in "${@}" ; do
  case  $argx in
   m|main) shift ; main "${@}" ; exit 0 ;;
   # other args
   *) return 0 ;;
  esac ; done
 # no args
 [ $# -eq 0 ] && return 0 ;

--- End code ---

with the above addition ( worked out in this (messy) topic http://forum.tinycorelinux.net/index.php/topic,26133.msg167895.html )
its possible to source the script to access the functions within shell

which imho can be useful for testing / composing new  functions / cases .

Rich:
Hi mocore

--- Quote from: mocore on March 05, 2023, 02:42:14 AM --- ... its possible to source the script to access the functions within shell ...
--- End quote ---
Do you mean the way you can call functions from  /etc/init.d/tc-functions  from the command line:

--- Code: ---tc@E310:~$ echo $MIRROR

tc@E310:~$ getMirror
tc@E310:~$ echo $MIRROR
http://repo.tinycorelinux.net/10.x/x86/tcz
tc@E310:~$
--- End code ---

Because it's sourced in  ~/.ashrc:

--- Code: ---tc@E310:~$ head -n 4 .ashrc
# ~/.ashrc: Executed by SHells.
#
. /etc/init.d/tc-functions
if [ -n "$DISPLAY" ]
tc@E310:~$
--- End code ---

mocore:

 @rich
>Do you mean the way you can call functions from  /etc/init.d/tc-functions  from the command line:

yes like that callable in shell via sourcing a script

but  while also  avoiding calling the "main" function when sourced 

id thaught i had not added an example after posting so...


--- Code: ---# source & use functions in shell
. ./CustomGreeting.sh
say_hi foobar

# or
./CustomGreeting.sh main ; # call script and run the man function


--- End code ---

an example
replacing
> main "$@"
in https://git.savannah.gnu.org/cgit/guix.git/plain/etc/guix-install.sh
with 

--- Code: --- for argx in "${@}" ; do
  case  $argx in
   m|main) shift ; main "${@}" ; exit 0 ;;
   # other args
   *) return 0 ;;
  esac ; done
 # no args
 [ $# -eq 0 ] && return 0 ;

--- End code ---

allows ". source" of the script without ruining main

then functions or function inputs or environment can be tested / altered  / ect

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