feat: use unicode block elements in size bar

[dundee]

config option style.use-old-size-bar added to revert back to legacy size bar

closes #254

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.08 🎉

Comparison is base (a51e062) 93.50% compared to head (6ee4fbc) 93.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
+ Coverage   93.50%   93.58%   +0.08%     
==========================================
  Files          29       29              
  Lines        2786     2806      +20     
==========================================
+ Hits         2605     2626      +21     
+ Misses        140      139       -1     
  Partials       41       41              

Impacted Files	Coverage Δ
cmd/gdu/app/app.go	92.14% <100.00%> (+0.16%)	⬆️
tui/format.go	100.00% <100.00%> (ø)
tui/show.go	98.50% <100.00%> (ø)
tui/tui.go	91.00% <100.00%> (+0.09%)	⬆️
tui/utils.go	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[dundee]

@yurenchen000 How do you like it?

[yurenchen000]

That's awesome ✨
I like it very much

Thank you, I appreciate it

[dundee]

Great 🙂 I will add some more tests and then merge the PR.

[rwahyudi]

@dundee - The delimiter line on RHEL6/7/8 is not showing up as line :

[daniejstriata]

@dundee - The delimiter line on RHEL6/7/8 is not showing up as line :

@rwahyudi What are the details for the host you are connecting from? What is the OS, terminal application and TERM env?

[dundee]

This is probably more about the font used in the terminal. It probably supports just some selection of unicode block elements.

[rwahyudi]

Yup! The font that I'm using does not have the complete set of Unicode elements.

I'm on Windows 10 and tested using MobaXterm & Putty.

I tried 3 different fonts before raising the issue and all of them had similar problems.
The 3 fonts I used :
Consolas
Lucida Console
Courier New

Changing the font to Dejavu Sans Mono fix the issue, but I think Courier New is the default font for Putty on Windows.

[dundee]

Btw there is config option style.use-old-size-bar: true to use the old size bar.