If you'd like to see lua+tup in action, here's a little embedded project
that uses this combination.
https://github.com/DISTORTEC/distortos
Unfortunately it's meant for microcontrollers, so if you'd like to
actually build it you will need an arm-none-eabi- toolchain (there's a
link in README.md).
One thing that lua has and original tup parser doesn't is the
"getrelativedir" function, which allows to build input tree into an
identical output tree, but placed in a subdirectory. Well, you could do
the same with original parser, but you'd have to state full output path
in each rule, while in lua you just use this new function and everything
"just works". This ability is used in the project linked above.
Another interesting thing is the ability to open any file read-only and
generate rules from that - it's like run-script, but without need for
additional files in different language. This is demonstrated - for
example - in tup's testcases -
https://github.com/gittup/tup/blob/master/test/t2157-lua-open-file.sh
It's true that lua's syntax is not as simple as original tup parser's
syntax, but lua is really powerful (; There are many seemingly trivial
tasks that cannot be accomplished with tup's parser, but using lua it's
really simple - imagine every use case for patsubst() from Makefiles,
like appending "-I" in front of every string with include directory or
"-D" in front of every macro definition - this cannot be done in tup's
parser (at least I haven't found a way to do that). There are many uses
for such operation - imagine you have to write your build description so
that it works on both gcc and
any-other-compiler-that-has-completely-different-flags. So for one
configuration you have "-Idirectory -Dmacro" and for other
`/include="directory" /define="macro"`. If you'd like to only give
"directory" and "macro" (without any prefixes/suffixes) to some
variables and parse that later depending on the configuration, this
cannot be done without lua (or I don't know how, but I'm pretty certain
this cannot be done) or runscript.
Regards,
FCh
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