[Themes] add calc() support to distance in theme format. (#1105)

* Initial test to allow math in distances.

Support + and -
Needs spaces around + and -.

* [THEME] Fix printing theme with math in distance.

* [Theme] use calc() syntax.

* [Theme] Add * and /  to calc().

* [Theme] Fix the precedense ordering in parsing. Also avoid making copies.

* [Theme] Don't print unneeded ().

* [Theme] Add modulo to calc.

doc/rofi-script.5

@@ -64,8 +64,6 @@ Rofi sets the following environment variable when executing the script:
 .SS \fB\fCROFI\_RETV\fR
 .PP
 An integer number with the current state:
-
-.RS
 .IP \(bu 2
 \fB0\fP: Initial call of script.
 .IP \(bu 2
@@ -75,8 +73,6 @@ An integer number with the current state:
 .IP \(bu 2
 \fB10\-28\fP: Custom keybinding 1\-19
 
-.RE
-
 .SH Passing mode options
 .PP
 Extra options, like setting the prompt, can be set by the script.
@@ -96,8 +92,6 @@ For example to set the prompt:
 
 .PP
 The following extra options exists:
-
-.RS
 .IP \(bu 2
 \fBprompt\fP:      Update the prompt text.
 .IP \(bu 2
@@ -113,8 +107,6 @@ The following extra options exists:
 .IP \(bu 2
 \fBno\-custom\fP:   Only accept listed entries, ignore custom input.
 
-.RE
-
 .SH Parsing row options
 .PP
 Extra options for individual rows can be set.
@@ -134,17 +126,13 @@ For example:
 
 .PP
 The following options are supported:
-
-.RS
 .IP \(bu 2
 \fBicon\fP: Set the icon for that row.
 .IP \(bu 2
 \fBmeta\fP: Specify invisible search terms.
 .IP \(bu 2
 \fBnonselectable\fP: If true the row cannot activated.
 
-.RE
-
 .SH SEE ALSO
 .PP
 rofi(1), rofi\-sensible\-terminal(1), dmenu(1), rofi\-theme(5), rofi\-theme\-selector(1)

doc/rofi-theme-selector.1

@@ -18,17 +18,13 @@ It lets you preview each theme with the Enter key and apply the theme to your
 .SH Theme directories
 .PP
 \fBrofi\-theme\-selector\fP searches the following directories for themes:
-
-.RS
 .IP \(bu 2
 ${PREFIX}/share/rofi/themes
 .IP \(bu 2
 $XDG\_CONFIG\_HOME/rofi/themes
 .IP \(bu 2
 $XDG\_DATA\_HOME/share/rofi/themes
 
-.RE
-
 .PP
 ${PREFIX} reflects the install location of rofi. In most cases this will be "/usr".<br>
 $XDG\_CONFIG\_HOME is normally unset. Default path is "$HOME/.config".<br>