xargs: do not merge extra args before replacing

[YDX-2147483647]

Resolves #362

• If -I/-i/--replace is given, now we process extra args (read from stdin) one by one, and replace all matches in initial args (given in argv) with the same extra arg in each time. (i.e. Cartesian product)

# Before
$ printf 'a    bc\ndef\ng' | xargs -I _ echo '[_]'
[a bc def g]

# After
$ printf 'a    bc\ndef\ng' | cargo run --bin xargs -- -I _ echo '[_]'
[a    bc]
[def]
[g]

• -L (--max-lines), -n (--max-args) and -I/-i are mutually exclusive. Now we warn if more than one are given.

[codecov]

Codecov Report

Attention: Patch coverage is 91.78082% with 6 lines in your changes missing coverage. Please review.

Project coverage is 60.48%. Comparing base (a2e350c) to head (9bc80cd).

Files	Patch %	Lines
src/xargs/mod.rs	86.66%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #363      +/-   ##
==========================================
+ Coverage   60.03%   60.48%   +0.44%     
==========================================
  Files          32       32              
  Lines        4021     4069      +48     
  Branches      891      895       +4     
==========================================
+ Hits         2414     2461      +47     
  Misses       1254     1254              
- Partials      353      354       +1     

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[sylvestre]

@YDX-2147483647 sorry, i missed your question :(
you should do the same as the GNU implementation

[YDX-2147483647]

Never mind and thanks for your answer.

So those 100+ lines is worth changing. I'll update the branch and add more tests when I have time.

[YDX-2147483647]

Well, I've updated the branch. Could someone approve the CI? I think this PR is ready now.

[sylvestre]

it it ready for review? :)
thanks

[YDX-2147483647]

Yes! It is ready.

[sylvestre]

nice:
Warning: Changes from main: PASS +4 / FAIL -4 / ERROR +0 / SKIP +0