I've been using xcode for some months and this has never happened before, i'm not sure whether i pressed something i shouldn't have or meddled with the settings. Basically i write something like for(int i=1;i<=n;i++) and press enter, and the cursor is on the next line above the instruction, so there's no visual subordination of what I'm about to write next.
If i press the tab key before writing a new instruction below and then write for instance cout<<n-i<<endl;, the moment I press ; , the entire thing is moved in the same column(if that makes sense) again. This doesn't happen with other instructions like while or if. Help?
Normally indentation occurs when you open a block, as in type {. If you're using a blockless if then the code editor has to figure out after the fact what you're doing.
I'm not able to reproduce your problem, but here are a few tips :
To format a selection in the editor
Main menu : Editor > Structure > Re-indent ( or ^I )
To remove the automatic formatting when pressing ;
User Preferences : Text Editing > Automatic indent for : Uncheck the “;” box
Related
I'm currently designing a CLI interface for linux, and for various reasons I am not able to use ncurses. I am using exclusively C++ and the Qt framework.
Therefore, in order to have a user-friendly interface, I have to run this getch loop in a separate thread:
https://stackoverflow.com/a/912796/3605689
Which basically means I have to implement all basic functionalities (such as backspace) by myself. I have already implemented command completion and command history(like when you press tab or uparrow/downarrow in linux), but I can't figure out how to implement leftarrow/rightarrow (aka seeking through the typeahead).
Normally, I implement it like this: upon every gech which is not equal to -1, I check whether the user has pressed a special key (one that modifies the typeahead somehow). I then clear the stdout using the following function:
void inputobject::clear_line(int nletters)
{
QTextStream(stdout) << "\033[2K";
for(int i = 0; i < nletters;i++){
QTextStream(stdout) << "\b";
}
rewind(stdout);
}
And replace it with something else, effectively simulating the typeahead. For example, in the case of backspace, I would save the command call clear_line, and print the command out again, just with one less letter, behaving exactly as a normal console application would.
My real problem is with the cursor, in the case of left/rightarrow, I need to move the cursor visual in order to be able to indicate where in the text is the user seeking:
Because of the nature of how I rewrite the given stdout line to simulate the typeahead, it does not really matter where the cursor REALLY is, as long as it stays on the same line - it is just the visual that matters. How can I achieve moving the cursor visual on linux?
The answer was provided in the comment by Evilruff:
Cursor Movement
ANSI escape sequences allow you to move the cursor around the screen at will. This is more useful for full screen user interfaces generated by shell scripts, but can also be used in prompts. The movement escape sequences are as follows:
Position the Cursor:
\033[;H
Or
\033[L;Cf
puts the cursor at line L and column C.
Move the cursor up N lines:
\033[NA
Move the cursor down N lines:
\033[NB
Move the cursor forward N columns:
\033[NC
Move the cursor backward N columns:
\033[ND
Clear the screen, move to (0,0):
\033[2J
Erase to end of line:
\033[K
Save cursor position:
\033[s
Restore cursor position:
\033[u
Not using ncurses and co is a serious limitation.
It is hell to make correct input/output on shell for displaying anything.
The only others real solutions (I can't think as a solution to reimplement a ncurse-like library) I think of are:
making call to dialog (for some example www.linuxjournal.com/article/2807 and for the doc: http://linux.die.net/man/1/dialog)
using the framebuffer mecanism with Qt4 (here)
After typing
int func(){
And pressing enter I'm getting like this , since I have enabled auto close plugin
int func(){
//cursor stays here }
But what i need is
int func(){
//cursor stays here
}
I'm able to achieve the required indentation by changing snippets.conf, but I have to press c and Tab, where
c=%brace_open%%cursor%%brace_close%
brace_open={\n\t
brace_close=\n}\n
Auto-close plugin settings:
is there any other way of achieving ?? Thanks in advance.
I haven't been able to figure out how to get exactly what you've indicated, but the Autoclose plugin can get close. Typing int func(){ and pressing Enter gives the following, where the | character represents the cursor location:
int func(){
|
}
EDIT:
My Autoclose settings are as shown below. But that turns out not to be the whole story. See after the image for more.
While looking into this some more, I discovered some strange behavior. I don't know if it's at the root of your problem or not, but it's maybe something to consider.
Autoclose worked as I described when pressing Enter on the main keyboard, but not when pressing Enter on the keypad, with or without NumLock enabled. In the latter case, I got the same result you did.
I normally use an antique IBM Model M keyboard, so to eliminate any chance of the problem being caused by the keyboard itself, I tried a modern USB keyboard with keypad. The results were exactly the same.
Having a suspicion as to what was happening, and since it's open source, I pulled down the Autoclose source code and took a look. And found...
static gboolean
auto_close_chars(
AutocloseUserData *data,
GdkEventKey *event)
{
...
else if (ch == GDK_Return)
{
return improve_indent(sci, editor, pos);
}
...
}
A general search for GDK_Return turned up gdkkeysyms.h that defines all of the GDK key codes. In that, there's GDK_Return and also GDK_KP_Enter, where "KP" means "keypad". Since Autoclose doesn't recognize GDK_KP_Enter, it'll fail to respond to pressing Enter on the keypad.
So, if you're using a full keyboard with keypad, it should work ok so long as Enter on the main keyboard is being used. On the other hand, If you're using a laptop where there's only one Enter key, all bets are off.
Check out https://plugins.geany.org/autoclose.html for autoclose plugin. This will solve your problem.
In Linux you can directly install it by
sudo apt-get install geany-plugin-autoclose
I'm currently designing a CLI interface for linux, and for various reasons I am not able to use ncurses. I am using exclusively C++ and the Qt framework.
Therefore, in order to have a user-friendly interface, I have to run this getch loop in a separate thread:
https://stackoverflow.com/a/912796/3605689
Which basically means I have to implement all basic functionalities (such as backspace) by myself. I have already implemented command completion and command history(like when you press tab or uparrow/downarrow in linux), but I can't figure out how to implement leftarrow/rightarrow (aka seeking through the typeahead).
Normally, I implement it like this: upon every gech which is not equal to -1, I check whether the user has pressed a special key (one that modifies the typeahead somehow). I then clear the stdout using the following function:
void inputobject::clear_line(int nletters)
{
QTextStream(stdout) << "\033[2K";
for(int i = 0; i < nletters;i++){
QTextStream(stdout) << "\b";
}
rewind(stdout);
}
And replace it with something else, effectively simulating the typeahead. For example, in the case of backspace, I would save the command call clear_line, and print the command out again, just with one less letter, behaving exactly as a normal console application would.
My real problem is with the cursor, in the case of left/rightarrow, I need to move the cursor visual in order to be able to indicate where in the text is the user seeking:
Because of the nature of how I rewrite the given stdout line to simulate the typeahead, it does not really matter where the cursor REALLY is, as long as it stays on the same line - it is just the visual that matters. How can I achieve moving the cursor visual on linux?
The answer was provided in the comment by Evilruff:
Cursor Movement
ANSI escape sequences allow you to move the cursor around the screen at will. This is more useful for full screen user interfaces generated by shell scripts, but can also be used in prompts. The movement escape sequences are as follows:
Position the Cursor:
\033[;H
Or
\033[L;Cf
puts the cursor at line L and column C.
Move the cursor up N lines:
\033[NA
Move the cursor down N lines:
\033[NB
Move the cursor forward N columns:
\033[NC
Move the cursor backward N columns:
\033[ND
Clear the screen, move to (0,0):
\033[2J
Erase to end of line:
\033[K
Save cursor position:
\033[s
Restore cursor position:
\033[u
Not using ncurses and co is a serious limitation.
It is hell to make correct input/output on shell for displaying anything.
The only others real solutions (I can't think as a solution to reimplement a ncurse-like library) I think of are:
making call to dialog (for some example www.linuxjournal.com/article/2807 and for the doc: http://linux.die.net/man/1/dialog)
using the framebuffer mecanism with Qt4 (here)
I use the kate text editor for writing c++ code. I really like the editor except for its indentation behavior which drives me mad. I have the following problem: If I want to write code like
if( true )
{
//code
}
the indentation messes everything up initially: instead of inserting a tab and jumping to the position marked "//code" when hitting enter, kate just inserts a single blank space. So to describe it more in detail: You start from
if( true )
{//your cursor is here
}
and on pressing enter, kate produces something like
if( true )
{
[ ]//your cursor is here
}
where '[ ]' stands for a single blank space. But instead, I want kate to insert a tabulator to give the result indicated at the start. Or, to repeat it more verbosely, I want that kate gives me
if( true )
{
<tabulator>//your cursor is here
}
on hitting enter. I have played around with all settings and can not make it work. It drives me crazy. I selected "default identation mode normal", "Ident using tabulators" (8 characters). Does anybody know how to customize this behavior? I looked up the katerc file but couldn't find any options that would help me...
edit: I should add that it would be ok if kate would just give me
if( true )
{
//your cursor is here
}
on pressing enter. But this additional blank space is absolutely annoying.
Ok, I tried for half an hour, I don't know why I found out how to do it right AFTER posting the question :). So in case anybody has the same issue, here is the "solution": I missed that kate seems to have a global setting for the indentation mode as well as a local one for every file. In my case - for some reason - my file had special indentation options set. You can alter them via the menu bar by chosing "Tools -> Indentation". This local option overrides the global one! Or the global one is just the default for the local options, I don't know exactly...
You can create a config file .kateconfig and add the variables kate: replace-tabs off; tab-indents: true;
More on this in the manual.
I use the following lines to output my simulation's progress info in my c++ program,
double N=0;
double percent=0;
double total = 1000000;
for (int i; i<total; ++i)
{
percent = 100*i/total;
printf("\r[%6.4f%%]",percent);
}
It works fine!
But the problem is I see the terminal cursor keeps blinking cyclically through the numbers, this is very annoying, anyone knows how to get rid of this?
I've seen some programs like wget or ubuntu apt, they use progress bar or percentages too, but they seems no blinking cursor issue, I am wondering how did they do that?
Thanks!
You can hide and show the cursor using the DECTCEM (DEC text cursor enable mode) mode in DECSM and DECRM:
fputs("\e[?25l", stdout); /* hide the cursor */
fputs("\e[?25h", stdout); /* show the cursor */
Just a guess: try to use a proper number of '\b' (backspace) characters instead of '\r'.
== EDIT ==
I'm not a Linux shell wizard, but this may work:
system("setterm -cursor off");
// ...display percentages...
system("setterm -cursor on");
Don't forget to #include <cstdlib> or <iostream>.
One way to avoid a blinking cursor is (as suggested) to hide the cursor temporarily.
However, that is only part of the solution. Your program should also take this into account:
after hiding the cursor and modifying the screen, before showing the cursor again move it back to the original location.
hiding/showing the cursor only keeps the cursor from noticeably blinking when your updates take only a small amount of time. If you happened to mix this with some time-consuming process, your cursor will blink.
The suggested solution using setterm is not portable; it is specific to the Linux console. And running an executable using system is not really necessary. But even running
system("tput civis");
...
system("tput cnorm");
is an improvement over using setterm.
Checking the source-code for wget doesn't find any cursor-hiding escape sequences. What you're seeing with its progress bar is that it leaves the cursor in roughly the same place whenever it does something time-consuming. The output to the terminal takes so little time that you do not notice the momentary rewrite of the line (by printing a carriage return, then writing most of the line over again). If it were slower, then hiding the cursor would help — up to a point.
By the way — this cursor-hiding technique is used in the terminal drivers for some editors (vim and vile).
Those apps are probably using ncurses. See mvaddstr
The reason the cursor jumps around is because stdout is buffered, so you don't know actually how many characters are being printed at some point in time. The reason wget does not have a jumping cursor is that they are actually printing to stderr instead, which is unbuffered. Try the following:
fprintf(stderr, "\r[%6.4f%%]", percent);
This also has the advantage of not cluttering the file if you are saving the rest of the output somewhere using a pipe like:
$ ./executable > log.data
Press insert key...if that doesn't work then press the fn key in your keyboard.
This will definitely work
Hope this helps