Add C0 and C1 Control code support

[OmegaRogue]

it would be nice to have the control codes shown as their according control pictures instead of diamonds with question marks and boxes

[philippnurullin]

Hi @OmegaRogue . Please add the screenshots. It's difficult to understand your request.

[trygveaa]

Control codes are generally not printable characters. When would they be shown?

Are you sure it's not your application rendering a control code as something else?

[alexeyten]

May be this? https://en.wikipedia.org/wiki/Control_Pictures

[OmegaRogue]

May be this? https://en.wikipedia.org/wiki/Control_Pictures

yes, there are more of them listed here https://en.wikipedia.org/wiki/C0_and_C1_control_codes#Basic_ASCII_control_codes

[OmegaRogue]

this is what all non whitespace characters from ascii 0x00 to 0x1F look currently in JetBrains Mono:

this is the same file but opened in the IntelliJ BinEd Plugin, which has support for control pictures:

These still have the problem of being a bit too small to be easily read, so having these control pictures in JetBrains mono could make reading binary serialized data easier by having distinguishable symbols instead of boxes

[somethingSTRANGE]

Characters associated with control code are probably best represented with symbols like those in the screenshot @OmegaRogue provided above, since it's easy to identify what they are.

N      S      S      E      E      E      A      B      B      H      L      V      F      C      S      S
 U      O      T      T      O      N      C      E      S      T      F      T      F      R      O      I
  L      H      X      X      T      Q      K      L

D      D      D      D      D      N      S      E      C      E      S      E      F      G      R      U      
 L      C      C      C      C      A      Y      T      A      M      U      S      S      S      S      S
  E      1      2      3      4      K      N      B      N             B      C

Personally, however, I have nostalgia for Code page 437 (used by the the original IBM PC) and how the control characters were represented there:

The best roguelikes use code page 437.

That said, the @OmegaRogue suggestion makes more sense.

[philippnurullin]

Hi, added the Control codes. Experimented with placement of letters. The diagonal placement was not adding anything particular good. There were no additional space to make letters bigger, and there is a downside of shifting reading pattern from horizontal. Please see and test.
Grab the files from here https://github.com/JetBrains/JetBrainsMono/tree/master/fonts

[OmegaRogue]

I don't see any characters for the control codes in those files, and whats weird is that I thought this issue was already resolved, as the control codes already got support in the IDEs (at least goland, where i tested it), and it works very well there, and i thought it was part of JetBrains Mono already, and that it just didnt work correctly in terminals

goland:

gedit:

fontforge:

[philippnurullin]

Ok, let's see.
Here is a screenshot of what they should look.

Can you please paste the actual unicode numbers for the symbols or a sampel of text so i can test it?

[OmegaRogue]

Uploading it as a gist caused problems with 0x00, so here's the file
C0.txt
in the format
0x[Unicode byte]: [character]

[OmegaRogue]

HT (0x09), LF (0x0A) and CR (0x0D) aren't in there, because they are tab, linefeed and carriage return, \t, \n and \r respectively

[OmegaRogue]

the codes for the last half was missing a 1
C0.txt