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calc

A beautiful and robust calculator for the command line

Dependencies

This calculator depends upon GNU readline library which is installed by default in most *nix systems because bash also uses it.

If not available on your system search for a binary package named libreadline-dev.

Or compile from source from http://ftp.gnu.org/gnu/readline/ of the form regex(readline-[0-9].[0-9].tar.gz).

How to install?

Installation can be done easily by executing ./install.sh.

Or can also be installed by the traditional make and sudo make install commands.

Note: Default install location/prefix is /usr/local/. To change the location use make PREFIX=<dir> install

Using man pages if not installed

  • Viewing in terminal:

      groff -man -Tascii doc/man/man1/calc.1 | less

  • Exporting as pdf:

      groff -man doc/man/man1/calc.1 | ps2pdf - > man_calc.pdf

  • Exporting as html:

      groff -man -Thtml doc/man/man1/calc.1 > man_calc.html

Note: The man page is generally updated after a long time. So, be careful with it.

I can't see it

This is a problem when the color of the input/output/error/prompt is nearly close to that of the terminal's background color. This happens because, by default no background is set when the calculator is first opened. The input color is by default white so it would be problematic for people to see the input if they have a background color close to white. To change the text color use:

change input color black

Similarly, output color can be changed using:

change output color yellow

For more information use calc "help font" -q.

Your own configuration[init/rc file]

If you have finished fixing your colors then add the command(s) to a file lets say, /home/user/.calc.conf. In turn make the calculator process the same file whenever you open it using calc -f /home/user/.calc.conf. If that seems long to you then add an alias to .bashrc lets say calc_init using alias calc_init='calc -f /home/user/.calc.conf' command. After that just run calc_init instead of calc to get your colors working without the need to change colors every time you open the calculator.

Now that doesn't mean that it works only for colors. You can put in any direct input command in /home/user/.calc.conf to (de)activate features of the calculator. An example file is provided in the root of the repository named .calc.config. You can modify it to suit your needs.