Mustache.ex
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schultyy
Rendering fails with no errors
I'm building a Base16 builder in Elixir and I've come across a case where rendering is failing with no errors. Here's my test case:
defmodule TestMustache do
def test_mustache() do
data = %{
"base04-rgb-b" => 109.0,
"base07-rgb-g" => 23.0,
"base00-dec-b" => 0.9568627450980393,
"scheme-name" => "Atelier Cave Light",
"base0C-rgb-r" => 57.0,
"base00-dec-r" => 0.9372549019607843,
"base0C-dec-g" => 0.5450980392156862,
"base0B-rgb-r" => 42.0,
"base04-rgb-r" => 101.0,
"base04-hex-r" => "65",
"base0B-hex" => "2a9292",
"base0E-hex" => "955ae7",
"base0E-dec-b" => 0.9058823529411765,
"base0F-dec-b" => 0.7490196078431373,
"base0D-hex-r" => "57",
"base07-hex-b" => "1c",
"base08-dec-g" => 0.27450980392156865,
"base08-hex-r" => "be",
"base05-rgb-b" => 96.0,
"base0E-dec-g" => 0.35294117647058826,
"base01-dec-r" => 0.8862745098039215,
"base0F-rgb-r" => 191.0,
"base09-hex-g" => "57",
"base09-rgb-r" => 170.0,
"base01-hex-r" => "e2",
"base01-hex" => "e2dfe7",
"base06-dec-r" => 0.14901960784313725,
"base05-hex-r" => "58",
"base05-dec-g" => 0.3215686274509804,
"base01-rgb-b" => 231.0,
"base0A-rgb-r" => 160.0,
"base00-hex-g" => "ec",
"base0C-hex-r" => "39",
"base02-dec-r" => 0.5450980392156862,
"base0C-dec-b" => 0.7764705882352941,
"base07-dec-r" => 0.09803921568627451,
"base04-dec-g" => 0.37254901960784315,
"base0B-hex-g" => "92",
"base00-rgb-g" => 236.0,
"base07-hex-r" => "19",
"base0D-rgb-g" => 109.0,
"base07-hex-g" => "17",
"base0C-hex-b" => "c6",
"base09-rgb-b" => 60.0,
"scheme-author" => "Bram de Haan (http://atelierbramdehaan.nl)",
"base04-hex-b" => "6d",
"base02-rgb-r" => 139.0,
"base00-hex" => "efecf4",
"base03-hex-r" => "7e",
"base08-hex-b" => "78",
"base03-hex-g" => "78",
"base0A-rgb-b" => 59.0,
"base06-rgb-b" => 42.0,
"base0C-rgb-g" => 139.0,
"base0B-dec-r" => 0.16470588235294117,
"base04-rgb-g" => 95.0,
"base0E-rgb-r" => 149.0,
"base06-hex-b" => "2a",
"base0D-rgb-r" => 87.0,
"base0B-rgb-g" => 146.0,
"base09-dec-b" => 0.23529411764705882,
"base00-hex-r" => "ef",
"base02-dec-g" => 0.5294117647058824,
"base08-dec-r" => 0.7450980392156863,
"base0A-hex-r" => "a0",
"base09-hex" => "aa573c",
"base06-dec-b" => 0.16470588235294117,
"base07-hex" => "19171c",
"base05-dec-r" => 0.34509803921568627,
"base04-hex" => "655f6d",
"base01-rgb-g" => 223.0,
"base02-dec-b" => 0.5725490196078431,
"base0A-hex" => "a06e3b",
"base0F-rgb-b" => 191.0,
"base07-dec-b" => 0.10980392156862745,
"base06-rgb-g" => 35.0,
"base08-rgb-g" => 70.0,
"base07-rgb-b" => 28.0,
"base0F-dec-g" => 0.25098039215686274,
"base05-dec-b" => 0.3764705882352941,
"base0C-dec-r" => 0.2235294117647059,
"base02-hex" => "8b8792",
"base0A-dec-b" => 0.23137254901960785,
"base0E-rgb-g" => 90.0,
"base02-hex-b" => "92",
"base06-hex-g" => "23",
"base0F-rgb-g" => 64.0,
"base06-hex" => "26232a",
"base0C-rgb-b" => 198.0,
"base04-dec-b" => 0.42745098039215684,
"base0A-rgb-g" => 110.0,
"base05-hex-g" => "52",
"base01-dec-b" => 0.9058823529411765,
"base0B-rgb-b" => 146.0,
"base07-dec-g" => 0.09019607843137255,
"base01-hex-b" => "e7",
"base00-hex-b" => "f4",
"base03-hex" => "7e7887",
"base0E-hex-b" => "e7",
"base05-hex-b" => "60",
"base03-rgb-b" => 135.0,
"base0A-hex-b" => "3b",
"base02-hex-r" => "8b",
"base03-hex-b" => "87",
"base02-rgb-b" => 146.0,
"base07-rgb-r" => 25.0,
"base0F-hex-r" => "bf",
"base01-rgb-r" => 226.0,
"base03-rgb-g" => 120.0,
"base02-rgb-g" => 135.0,
"base0F-hex-g" => "40",
"base0E-hex-g" => "5a",
"base0B-hex-r" => "2a",
"base06-hex-r" => "26",
"base04-hex-g" => "5f",
"base0A-hex-g" => "6e",
"base09-dec-g" => 0.3411764705882353,
"base08-hex-g" => "46",
"base09-hex-r" => "aa",
"base0F-hex" => "bf40bf",
"base03-dec-b" => 0.5294117647058824,
"base09-rgb-g" => 87.0,
"base0C-hex" => "398bc6",
"base0E-hex-r" => "95",
"base0D-hex-b" => "db",
"base06-rgb-r" => 38.0,
"base0E-rgb-b" => 231.0,
"base0A-dec-r" => 0.6274509803921569,
"base01-dec-g" => 0.8745098039215686,
"base06-dec-g" => 0.13725490196078433,
"base0E-dec-r" => 0.5843137254901961,
"base09-dec-r" => 0.6666666666666666,
"base05-rgb-g" => 82.0,
"base0B-dec-g" => 0.5725490196078431,
"base03-dec-r" => 0.49411764705882355,
"base05-rgb-r" => 88.0,
"base0A-dec-g" => 0.43137254901960786,
"base00-rgb-b" => 244.0,
"base0F-hex-b" => "bf",
"base0B-hex-b" => "92",
"base08-rgb-b" => 120.0,
"base08-rgb-r" => 190.0,
"base0C-hex-g" => "8b",
"base0D-rgb-b" => 219.0,
"base08-dec-b" => 0.47058823529411764,
"scheme-slug" => "atelier-cave-light",
"base05-hex" => "585260",
"base02-hex-g" => "87",
"base01-hex-g" => "df",
"base03-dec-g" => 0.47058823529411764,
"base0D-hex" => "576ddb",
"base0F-dec-r" => 0.7490196078431373,
"base04-dec-r" => 0.396078431372549,
"base0D-dec-g" => 0.42745098039215684,
"base00-rgb-r" => 239.0,
"base0B-dec-b" => 0.5725490196078431,
"base0D-hex-g" => "6d",
"base00-dec-g" => 0.9254901960784314,
"base09-hex-b" => "3c",
"base03-rgb-r" => 126.0,
"base0D-dec-r" => 0.3411764705882353,
"base08-hex" => "be4678",
"base0D-dec-b" => 0.8588235294117647
}
template = """
# Base16 {{scheme-name}} - alacritty color config
# {{scheme-author}}
colors:
# Default colors
primary:
background: '0x{{base00-hex}}'
foreground: '0x{{base05-hex}}'
# Colors the cursor will use if `custom_cursor_colors` is true
cursor:
text: '0x{{base00-hex}}'
cursor: '0x{{base05-hex}}'
# Normal colors
normal:
black: '0x{{base00-hex}}'
red: '0x{{base08-hex}}'
green: '0x{{base0B-hex}}'
yellow: '0x{{base0A-hex}}'
blue: '0x{{base0D-hex}}'
magenta: '0x{{base0E-hex}}'
cyan: '0x{{base0C-hex}}'
white: '0x{{base05-hex}}'
# Bright colors
bright:
black: '0x{{base03-hex}}'
red: '0x{{base09-hex}}'
green: '0x{{base01-hex}}'
yellow: '0x{{base02-hex}}'
blue: '0x{{base04-hex}}'
magenta: '0x{{base06-hex}}'
cyan: '0x{{base0F-hex}}'
white: '0x{{base05-hex}}'
"""
Mustache.render(template, data)
end
end
and the output is not interpolated and look like this:
"# Base16 {{scheme-name}} - alacritty color config\n# {{scheme-author}}\ncolors:\n # Default colors\n primary:\n background: '0x{{base00-hex}}'\n foreground: '0x{{base05-hex}}'\n\n # Colors the cursor will use if `custom_cursor_colors` is true\n cursor:\n text: '0x{{base00-hex}}'\n cursor: '0x{{base05-hex}}'\n\n # Normal colors\n normal:\n black: '0x{{base00-hex}}'\n red: '0x{{base08-hex}}'\n green: '0x{{base0B-hex}}'\n yellow: '0x{{base0A-hex}}'\n blue: '0x{{base0D-hex}}'\n magenta: '0x{{base0E-hex}}'\n cyan: '0x{{base0C-hex}}'\n white: '0x{{base05-hex}}'\n\n # Bright colors\n bright:\n black: '0x{{base03-hex}}'\n red: '0x{{base09-hex}}'\n green: '0x{{base01-hex}}'\n yellow: '0x{{base02-hex}}'\n blue: '0x{{base04-hex}}'\n magenta: '0x{{base06-hex}}'\n cyan: '0x{{base0F-hex}}'\n white: '0x{{base05-hex}}'\n\n"
(I'm on version 0.3.1 this time)
I know this is about a month late, but it's failing because - is an invalid character for a variable in this Mustache library. I can't find any indication of valid/invalid characters in the original Mustache spec, but for Elixir it makes sense to forbid this character since it's forbidden in (unquoted) atoms. If you replace all the -s with _, rendering works.
I actually switched to bbmustache (an Erlang library) and stopped having issues. I don’t really know much about the original Mustache spec, but bbmustache worked for me.