util.dbuffer: Add efficient shortcuts for discard() in certain cases
If the buffer is already empty, nothing to do. If we're throwing away the
whole buffer, we can just empty it and avoid read_chunk() (which in turn
may collapse()). These shortcuts are much more efficient.
local sep = package.config:match("(.)\n");
describe("util.paths", function ()
local paths = require "util.paths";
describe("#join()", function ()
it("returns single component as-is", function ()
assert.equal("foo", paths.join("foo"));
end);
it("joins paths", function ()
assert.equal("foo"..sep.."bar", paths.join("foo", "bar"))
end);
it("joins longer paths", function ()
assert.equal("foo"..sep.."bar"..sep.."baz", paths.join("foo", "bar", "baz"))
end);
it("joins even longer paths", function ()
assert.equal("foo"..sep.."bar"..sep.."baz"..sep.."moo", paths.join("foo", "bar", "baz", "moo"))
end);
end)
describe("#glob_to_pattern()", function ()
it("works", function ()
assert.equal("^thing.%..*$", paths.glob_to_pattern("thing?.*"))
end);
end)
describe("#resolve_relative_path()", function ()
it("returns absolute paths as-is", function ()
if sep == "/" then
assert.equal("/tmp/path", paths.resolve_relative_path("/run", "/tmp/path"));
elseif sep == "\\" then
assert.equal("C:\\Program Files", paths.resolve_relative_path("A:\\", "C:\\Program Files"));
end
end);
it("resolves relative paths", function ()
if sep == "/" then
assert.equal("/run/path", paths.resolve_relative_path("/run", "path"));
end
end);
end)
end)