<commit_before>package clui

import (
	"bufio"
	term "github.com/nsf/termbox-go"
	"io/ioutil"
	"os"
	"strings"
)

/*
ThemeManager support for controls.
The current implementation is limited but later the manager will be
able to load a requested theme on demand and use deep inheritance.
Theme 'default' exists always - it is predefinded and always complete.
User-defined themes may omit any theme section, all omitted items
are loaded from parent theme. The only required property that a user-
defined theme must have is a theme name.
*/
type ThemeManager struct {
	// available theme list
	themes map[string]theme
	// name of the current theme
	current   string
	themePath string<commit_msg>#27 - add theme file format description<commit_after>package clui

import (
	"bufio"
	term "github.com/nsf/termbox-go"
	"io/ioutil"
	"os"
	"strings"
)

/*
ThemeManager support for controls.
The current implementation is limited but later the manager will be
able to load a requested theme on demand and use deep inheritance.
Theme 'default' exists always - it is predefinded and always complete.
User-defined themes may omit any theme section, all omitted items
are loaded from parent theme. The only required property that a user-
defined theme must have is a theme name.

Theme file is a simple text file that has similar to INI file format:
1. Every line started with '#' or '/' is a comment line.
2. Invalid lines - lines that do not contain symbol '=' - are skipped.
3. Valid lines are splitted in two parts:
    key - the text before the first '=' in the line
    value - the text after the first '=' in the line (so, values can
        include '=')
4. There is no mandatory keys - all of them are optional
5. Avaiable system keys that used to describe the theme:
    'title' - the theme title
    'author' - theme author
    'version' - theme version
    'parent' - name of the parent theme. If it is not set then the
        'default' is used as a parent
6. Non-system keys are divided into two groups: Colors and Objects
    Colors are the keys that end with 'Back' or 'Text' - background
        and text color, respectively. If theme manager cannot
        value to color it panics. See Color*Back * Color*Text constants.
    Other keys are considered as objects - see Obj* constants.
    One is not limited with only predefined color and object names.
    The theme can inroduce its own objects, e.g. to provide a runes or
        colors for new control that is not in standard library
To see the real world example of full featured theme, please see
    included theme 'turbovision'
*/
type ThemeManager struct {
	// available theme list
	themes map[string]theme
	// name of the current theme
	current   string
	themePath string
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