93 lines
2.4 KiB
VimL
93 lines
2.4 KiB
VimL
"
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" Regex pattern for a hex color.
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"
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" Examples:
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" - '#123ABC'
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" - '#FFFFFF'
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" - '#000000'
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"
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let s:hex_color_pattern = '#[0-9A-Fa-f]\{6\}'
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"
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" Return hex string equivalent to given decimal string or number.
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"
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" Example: color_helper#dec_to_hex(255, 2)
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" Returns: 'FF'
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"
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" Example: color_helper#dec_to_hex(255, 5)
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" Returns: '000FF'
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"
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function! color_helper#dec_to_hex(arg, padding)
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return toupper(printf('%0' . a:padding . 'x', a:arg + 0))
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endfunction
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"
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" Return number equivalent to given hex string ('0x' is optional).
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"
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" Example: color_helper#hex_to_dec('FF')
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" Returns: 255
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"
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" Example: color_helper#hex_to_dec('88')
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" Returns: 136
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"
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" Example: color_helper#hex_to_dec('00')
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" Returns: 0
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"
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function! color_helper#hex_to_dec(arg)
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return (a:arg =~? '^0x') ? a:arg + 0 : ('0x'.a:arg) + 0
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endfunction
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"
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" Example: color_helper#hex_color_to_rgb('#0088FF')
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" Returns: [0, 136, 255]
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"
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function! color_helper#hex_color_to_rgb(hex_color)
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let l:rgb = []
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if matchstr(a:hex_color, s:hex_color_pattern) == a:hex_color
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let l:red = color_helper#hex_to_dec(strpart(a:hex_color, 1, 2))
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let l:green = color_helper#hex_to_dec(strpart(a:hex_color, 3, 2))
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let l:blue = color_helper#hex_to_dec(strpart(a:hex_color, 5, 2))
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let l:rgb = [l:red, l:green, l:blue]
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end
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return l:rgb
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endfunction
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"
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" Example: color_helper#rgb_color_to_hex([0, 136, 255])
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" Returns: '#0088FF'
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"
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function! color_helper#rgb_color_to_hex(rgb_color)
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let l:hex_color = '#'
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let l:hex_color .= color_helper#dec_to_hex(a:rgb_color[0], 2) " red
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let l:hex_color .= color_helper#dec_to_hex(a:rgb_color[1], 2) " green
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let l:hex_color .= color_helper#dec_to_hex(a:rgb_color[2], 2) " blue
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return l:hex_color
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endfunction
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"
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" Example: color_helper#hex_color_brighten('#000000', 0.10)
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" Returns: '#191919'
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"
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function! color_helper#hex_color_brighten(color, percent)
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let l:rgb = color_helper#hex_color_to_rgb(a:color)
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let l:rgb_brightened = []
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for decimal in l:rgb
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call add(l:rgb_brightened, float2nr((255 - decimal) * a:percent))
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endfor
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return color_helper#rgb_color_to_hex(l:rgb_brightened)
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endfunction
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"
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" Example: color_helper#hex_color_darken('#FFFFFF', 0.10)
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" Returns: '#E5E5E5'
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"
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function! color_helper#hex_color_darken(color, percent)
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let l:rgb = color_helper#hex_color_to_rgb(a:color)
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let l:rgb_darkened = []
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for decimal in l:rgb
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call add(l:rgb_darkened, float2nr(decimal * (1 - a:percent)))
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endfor
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return color_helper#rgb_color_to_hex(l:rgb_darkened)
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endfunction
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