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progress-bar: hide expected if expected is 0 (unknown)

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Sometimes, "expected" can be "0", but in fact means "unknown".

This is for example the case when downloading a file while the http
server doesn't send the `Content-Length` header, like when running `nix
build` pointing to a nixpkgs checkout streamed from GitHub:

⇒  nix build -f https://github.com/NixOS/nixpkgs/archive/master.tar.gz hello
[1.8/0.0 MiB DL] downloading 'https://github.com/NixOS/nixpkgs/archive/master.tar.gz'

In that case, don't show that weird progress bar, but only the (slowly
increasing) downloaded size ("done").

⇒  nix build -f https://github.com/NixOS/nixpkgs/archive/master.tar.gz hello
[1.8 MiB DL] downloading 'https://github.com/NixOS/nixpkgs/archive/master.tar.gz'

This commit also updates fmt calls with three numbers (when something is
currently 'running' too) - I'm not sure if this can be provoked, but
showing "0" as expected doesn't make any sense, as we're obviously doing
more than nothing.
This commit is contained in:
Florian Klink 2019-05-06 22:23:15 +02:00
parent f9a2ea4486
commit 6ade7ec022
1 changed files with 11 additions and 4 deletions
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7
src/nix/progress-bar.cc
View file

@ -333,11 +333,18 @@ public:
if (running || done || expected || failed) {
if (running)
if (expected != 0)
s = fmt(ANSI_BLUE + numberFmt + ANSI_NORMAL "/" ANSI_GREEN + numberFmt + ANSI_NORMAL "/" + numberFmt,
running / unit, done / unit, expected / unit);
else
s = fmt(ANSI_BLUE + numberFmt + ANSI_NORMAL "/" ANSI_GREEN + numberFmt + ANSI_NORMAL,
running / unit, done / unit);
else if (expected != done)
if (expected != 0)
s = fmt(ANSI_GREEN + numberFmt + ANSI_NORMAL "/" + numberFmt,
done / unit, expected / unit);
else
s = fmt(ANSI_GREEN + numberFmt + ANSI_NORMAL, done / unit);
else
s = fmt(done ? ANSI_GREEN + numberFmt + ANSI_NORMAL : numberFmt, done / unit);
s = fmt(itemFmt, s);