Proposed Powerline theme syntax

default.json

{
	"name": "default",
	"segments": {
		"left": [
			{
				"type": "function",
				"name": "mode"
			},
			{
				"type": "function",
				"name": "paste_indicator",
				"exclude_modes": ["nc"],
				"priority": 10
			},
			{
				"type": "function",
				"name": "branch",
				"exclude_modes": ["nc"],
				"priority": 60,
				"before": "⭠ "
			},
			{
				"type": "function",
				"name": "readonly_indicator",
				"exclude_modes": ["nc"],
				"draw_divider": false
			},
			{
				"type": "function",
				"name": "file_directory",
				"priority" 40,
				"draw_divider": false
			},
			{
				"type": "function",
				"name": "file_name",
				"draw_divider": false
			},
			{
				"type": "function",
				"name": "modified_indicator",
				"draw_divider": false
			},
			{
				"type": "function",
				"name": "modified_indicator",
				"args": { "text": "+" },
				"exclude_modes": ["nc"]
			},
			{
				"type": "filler",
				"highlight": ["background"]
			},
		],
		"right": [
			{
				"type": "function",
				"name": "file_format",
				"draw_divider": false,
				"exclude_modes": ["nc"],
				"priority" 50
			},
			{
				"type": "function",
				"name": "file_encoding",
				"exclude_modes": ["nc"],
				"priority" 50
			},
			{
				"type": "function",
				"name": "file_type",
				"exclude_modes": ["nc"],
				"priority" 50
			},
			{
				"type": "function",
				"name": "line_percent",
				"args": { "gradient": true },
				"priority": 30
			},
			{
				"type": "string",
				"contents": "⭡ ",
				"highlight": ["line_current_symbol", "line_current"]
			},
			{
				"type": "function",
				"name": "line_current",
				"draw_divider": false
			},
			{
				"type": "function",
				"name": "col_current",
				"draw_divider": false,
				"priority": 30
			},
		]
	}
}