uris: extract, export and report count and size

[Thell]

• use the apt-get --print-uris output to obtain information and
  present to user prior to downloading.
• make DLLISTCOUNT and DLLISTBYTES available to the aria2 environment
  such that --on-download-[stop|complete] scripts have access.

Signed-off-by: Thell Fowler thell@tbfowler.name

--->8---

In response to #84 as well as my own desire to have more useful output during docker builds (aka a progress monitor for noninteractive shells).

[Thell]

Just to mention... I opted for numfmt iec-i to align with the Download Results rather than si which would more closely align with apt. Either way, since it is rounded the results match up.

[varhub]

Hello @Thell,

In #91 I broke your PR, sorry.
By the way, I think that code seems better because removes complex regex of grep and sed.
Doing it I noticed that plain --print-uris already comes with file size as cut -d' ' -f3, so if you wish I can take a look to DLLISTBYTES

[Thell]

@varhub Thanks for the offer, and the reminder this existed. The PR needs to be updated to reflect a better solution in use here. I'll do so later and submit a new PR.

DLLISTBYTES=$( echo "$apturis"| awk -F " " '{bytes+=$3} END{print bytes}' )

[Lasall]

@Thell Do you think you can work on another PR to add this feature?

[Thell]

Sure, but it will be some months down the road. If someone else gets to it first... :)

[Lasall]

For the record I pushed a solution for #84 to the sources, so the original intention of --on-download-[stop|complete] scripts might be easier to implement now.