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# frozen_string_literal: true
RSpec.describe TTY::Reader::History do
it "has no lines" do
history = described_class.new
expect(history.size).to eq(0)
end
it "doesn't navigate through empty buffer" do
history = described_class.new
expect(history.next?).to eq(false)
expect(history.previous?).to eq(false)
end
it "allows to cycle through non-empty buffer" do
history = described_class.new(3, cycle: true)
history << "line"
expect(history.next?).to eq(true)
expect(history.previous?).to eq(true)
end
it "defaults maximum size" do
history = described_class.new
expect(history.max_size).to eq(512)
end
it "presents string representation" do
history = described_class.new
expect(history.to_s).to eq("[]")
end
it "adds items to history without overflowing" do
history = described_class.new(3)
history << "line #1"
history << "line #2"
history << "line #3"
history << "line #4"
expect(history.to_a).to eq(["line #2", "line #3", "line #4"])
expect(history.index).to eq(2)
end
it "iterates over lines" do
history = described_class.new
history << "line #1"
history << "line #2"
history << "line #3"
expect { |block|
history.each(&block)
}.to yield_successive_args("line #1", "line #2", "line #3")
end
it "returns enumerator when iterating without a block" do
history = described_class.new
expect(history.each).to be_an(Enumerator)
end
it "excludes empty lines by default" do
history = described_class.new
history << ""
history << " "
expect(history.to_a).to eq([" "])
end
it "excludes lines matching pattern" do
exclude = ->(line) { /line #[23]/.match(line) }
history = described_class.new(exclude: exclude)
history << "line #1"
history << "line #2"
history << "line #3"
expect(history.to_a).to eq(["line #1"])
expect(history.index).to eq(0)
end
it "allows duplicates" do
history = described_class.new
history << "line #1"
history << "line #1"
history << "line #1"
expect(history.to_a).to eq(["line #1", "line #1", "line #1"])
end
it "prevents duplicates" do
history = described_class.new(duplicates: false)
history << "line #1"
history << "line #1"
history << "line #1"
expect(history.to_a).to eq(["line #1"])
end
it "navigates through history buffer without cycling" do
history = described_class.new(3)
history << "line #1"
history << "line #2"
history << "line #3"
expect(history.index).to eq(2)
history.previous
history.previous
expect(history.index).to eq(0)
history.previous
expect(history.index).to eq(0)
history.next
history.next
expect(history.index).to eq(2)
history.next
expect(history.next?).to eq(false)
expect(history.index).to eq(2)
end
it "navigates through history buffer with cycling" do
history = described_class.new(3, cycle: true)
history << "line #1"
history << "line #2"
history << "line #3"
expect(history.index).to eq(2)
history.previous
history.previous
expect(history.index).to eq(0)
history.previous
expect(history.index).to eq(2)
expect(history.next?).to eq(true)
history.next
history.next
expect(history.index).to eq(1)
history.next
expect(history.index).to eq(2)
end
it "checks if navigation is possible" do
history = described_class.new(3)
expect(history.index).to eq(nil)
expect(history.previous?).to eq(false)
expect(history.next?).to eq(false)
history << "line #1"
history << "line #2"
expect(history.index).to eq(1)
expect(history.previous?).to eq(true)
expect(history.next?).to eq(false)
history.previous
expect(history.index).to eq(0)
expect(history.previous?).to eq(true)
expect(history.next?).to eq(true)
history.previous
expect(history.index).to eq(0)
expect(history.previous?).to eq(true)
expect(history.next?).to eq(true)
end
it "gets line based on index" do
history = described_class.new(3, cycle: true)
history << "line #1"
history << "line #2"
history << "line #3"
expect(history[-1]).to eq("line #3")
expect(history[1]).to eq("line #2")
expect {
history[11]
}.to raise_error(IndexError, "invalid index")
end
it "retrieves current line" do
history = described_class.new(3, cycle: true)
expect(history.get).to eq(nil)
history << "line #1"
history << "line #2"
history << "line #3"
expect(history.get).to eq("line #3")
history.previous
history.previous
expect(history.get).to eq("line #1")
history.next
expect(history.get).to eq("line #2")
end
it "clears all lines" do
history = described_class.new(3)
history << "line #1"
history << "line #2"
history << "line #3"
expect(history.size).to eq(3)
history.clear
expect(history.size).to eq(0)
expect(history.index).to eq(0)
end
end
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