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util.interpolation: Add '~' as the opposite of '&' (render sub-block if falsy)

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One more magic character consumed!
This commit is contained in:
Matthew Wild 2020-09-09 17:10:33 +01:00
parent 33e7e5ef2d
commit 0ca2e88384
2 changed files with 14 additions and 1 deletions
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12
spec/util_interpolation_spec.lua
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@ -32,7 +32,15 @@ local template_map = [[
local expect_map = [[
FOO: bar
]]
local template_not = [[
{thing~Thing is nil}{thing&Thing is not nil}
]]
local expect_not_true = [[
Thing is not nil
]]
local expect_not_nil = [[
Thing is nil
]]
describe("util.interpolation", function ()
it("renders", function ()
local render = require "util.interpolation".new("%b{}", string.upper, { sort = function (t) table.sort(t) return t end });
@ -43,5 +51,7 @@ describe("util.interpolation", function ()
assert.equal(expect_func_pipe, render(template_func_pipe, { foo = { "c", "a", "d", "b", } }));
-- assert.equal("", render(template_func_pipe, { foo = nil })); -- FIXME
assert.equal(expect_map, render(template_map, { foo = { foo = "bar" } }));
assert.equal(expect_not_true, render(template_not, { thing = true }));
assert.equal(expect_not_nil, render(template_not, { thing = nil }));
end);
end);