I want to pad a format string to a certain length. For example, the Tmux Battery plugin introduces the battery_percentage format string. I can use this in the status bar as #{battery_percentage}. The battery percentage values can be:
Between 0% and 9% (One Digit).
Between 11% and 99% (Two Digits).
Exactly 100% (Three Digits).
I want the format string to always be displayed 3 digits, padded with spaces at the end, how can I achieve that?
I saw that there is the format #{pN:variable} in this page, but it did not work when I tried to use it with format strings, even though at the end they are variables. Maybe I just did not know how to use it, I don't know...
Looking at the plugin startup code, battery.tmux, you can see that ${battery_percentage} is actually converted to #($CURRENT_DIR/scripts/battery_percentage.sh), which is a request to run a script. I don't know if #{p3:#(...)} can be made to work since this is not a simple variable.
You could always edit the plugin shell script to return the padded string (assuming tmux keeps the leading spaces).
Related
I can't really seem to find a standard for this. I know inputs are taken as ASCII values, but are they required to be single characters? If not, how are multi-character inputs handled?
Command line inputs in most (if not all) programming languages are taken a line at a time. When you hit enter into a console after typing a line, the whole line gets sent into the program as a return value from the function you called to get the input.
In brainfuck, you have more control over this: You can get as many characters as you want at a time, and stop when you want to.
A single comma "," will get one byte's worth of input (a.k.a one character). If you want to handle getting a string until a newline is met, you can try implementing something like the following code (10 being the ascii value of newline and the number of repetitions of "+" and "-" chars):
[-]>,----------[++++++++++>,----------]<[<]
An array of non zero values starting and ending with zero values is saved into memory containing the ascii values of input chars.
Hello there Stackoverflow, I've been tasked with making a flat file schema as well as a map, however, our specifications are that there are 3 fields,
----------
Name Length
----------
TIdentity 2
OIdentity 17
Result 2
However, the file that we receive is 500(ish) characters long, is there a way to make it ignore the remaning empty characters??
Thanks for any help you guys might be able to supply
You should definitely ensure the spec and sample files are correct (particularly that the spec contains any whitespace requirements/options), but assuming they are and you're just supposed to ignore the whitespace, you can create node to stuff the whitespace into and just ignore it.
Without knowing a bit more about your requirements, it's hard to say exactly how this should work. If the whitespace is always a fixed length, make a node that expects that many characters. If it's not always a fixed length, you may have to make a repeating node that's one character long but not the record terminator (presumably CR/LF or something of the like). If the whitespace itself is the delimiter, you might be able to do something with the ignore_trailing_delimiter on the record.
Worst case scenario (whitespace is variable, you can't control the partner who sends it to you, and you can't get the FFDASM to sensibly deal with it), write a custom Decode component to preprocess the file and remove the extraneous whitespace.
My program makes calculations on physics vectors and it allows copy/pasting from websites and then tries to parse them into the x, y, and z components automatically. I've come across one website (http://mathinsight.org/cross_product_examples) that has (3,−3,1). While that looks normal, that minus is actually not recognized by VB. Visually, it is longer than the normal minus (− and -), but return the same Unicode of 45. This picture shows the Unicode for every character (I added a minus in front of the first 3 for comparison) in the Textbox. Also, from this website, I had to use Ctrl+c because right clicking shows that this is not simple HTML.
One is valid (the first), but the second gives VB fits as shown below. Either it won't compile (shown by the blue line below) or a simple assignment (the second one) wrecks havok on my form.
I have tried using
vectorString.Replace("–", "-")
and pasting in the longer dash for the target string and a normal keystroke dash as the replacement, but nothing happens. I'm guessing that since they both have the same Unicode.
Is there some way to convert the longer, invalid dash into the one recognized by VB? I tried using dash symbol that Word likes to replace the minus sign with and it comes up as Unicode 150. So, apparently there are at least three different kinds of dashes. Any thoughts?
The character from Math Insight is U+2212, minus sign. The character you tried using in your Replace call is U+2013, en dash. That's why your replace didn't work.
Beyond the standard ASCII hyphen (-, U+0045), there are two common dashes: the en dash (–, U+2013) and the em dash (—, U+2014). There is also a figure dash (‒, U+2012), but it is not as common.
I've some records which are really messed up.
My team lead told me to find out the position of characters with ascii value 14 and 15.
I've a query
SELECT CHARINDEX(CHAR(14),X_CUSTOMER_COMMENTS)
FROM vp_service_requests;
SELECT CHARINDEX(CHAR(15),X_CUSTOMER_COMMENTS)
FROM vp_service_requests;
which returns 0 because i wasn't able to find char with 14 and 15 ascii value after google
search i found 14 and 15 ascii value are for shift in and shift out
how this represents on keyboard so i can try for it with CHAR(14) function.
As a holdover from the old DOS days, Windows still allows you to enter certain old ASCII keys from the keyboard by pressing and holding the ALT key, followed by the three-digit code you wish to enter (from the 10-key pad, not the numeric row atop the keyboard), eg for 14, type ALT-014.
However, some of the lower-level codes are inherited from old terminal functions, eg ASCII 7 is a bell, 8 is a backspace, eg, and rather that typing a character, they cause the cursor to behave a certain way or induce an application to respond in a defined manner. You can embed a CHAR(XX) value for testing simply by concatenating the value into a string and INSERTing it into your test table.
It should be Ctrl-N and Ctrl-O although I doubt this will help.
Try loading the records into a good editor and look at them in HEX. Weird characters should stick out like a sore thumb
I need to pad numbers with leading zeros (total 8 digits) for display. I'm using oracle.
select to_char(1011,'00000000') OPE_NO from dual;
select length(to_char(1011,'00000000')) OPE_NO from dual;
Instead of '00001011' I get ' 00001011'.
Why do I get an extra leading blank space? What is the correct number formatting string to accomplish this?
P.S. I realise I can just use trim(), but I want to understand number formatting better.
#Eddie: I already read the documentation. And yet I still don't understand how to get rid of the leading whitespace.
#David: So does that mean there's no way but to use trim()?
Use FM (Fill Mode), e.g.
select to_char(1011,'FM00000000') OPE_NO from dual;
From that same documentation mentioned by EddieAwad:
Negative return values automatically
contain a leading negative sign and
positive values automatically contain
a leading space unless the format
model contains the MI, S, or PR format
element.
EDIT: The right way is to use the FM modifier, as answered by Steve Bosman. Read the section about Format Model Modifiers for more info.