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tac: add support for --regex option to tac

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Add support for `tac --regex`, where the line separator is interpreted
as a regular expression.
This commit is contained in:
Jeffrey Finkelstein 2021-08-01 11:19:44 -04:00
parent 92a1f1422e
commit 664c7a6ec5
4 changed files with 152 additions and 6 deletions
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66
tests/by-util/test_tac.rs
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@ -1,4 +1,4 @@
// spell-checker:ignore axxbxx bxxaxx axxx axxxx xxaxx xxax xxxxa
// spell-checker:ignore axxbxx bxxaxx axxx axxxx xxaxx xxax xxxxa axyz zyax zyxa
use crate::common::util::*;
#[test]
@ -205,3 +205,67 @@ fn test_null_separator() {
.succeeds()
.stdout_is("b\0a\0");
}
#[test]
fn test_regex() {
new_ucmd!()
.args(&["-r", "-s", "[xyz]+"])
.pipe_in("axyz")
.succeeds()
.no_stderr()
.stdout_is("zyax");
new_ucmd!()
.args(&["-r", "-s", ":+"])
.pipe_in("a:b::c:::d::::")
.succeeds()
.no_stderr()
.stdout_is(":::d:::c::b:a:");
new_ucmd!()
.args(&["-r", "-s", r"[\+]+[-]+[\+]+"])
// line 0 1 2
// |--||-----||--------|
.pipe_in("a+-+b++--++c+d-e+---+")
.succeeds()
.no_stderr()
// line 2 1 0
// |--------||-----||--|
.stdout_is("c+d-e+---+b++--++a+-+");
}
#[test]
fn test_regex_before() {
new_ucmd!()
.args(&["-b", "-r", "-s", "[xyz]+"])
.pipe_in("axyz")
.succeeds()
.no_stderr()
.stdout_is("zyxa");
new_ucmd!()
.args(&["-b", "-r", "-s", ":+"])
.pipe_in(":a::b:::c::::d")
.succeeds()
.stdout_is(":d::::c:::b::a");
// Because `tac` searches for matches of the regular expression from
// right to left, the second to last line is
//
// +--++b
//
// not
//
// ++--++b
//
new_ucmd!()
.args(&["-b", "-r", "-s", r"[\+]+[-]+[\+]+"])
// line 0 1 2
// |---||----||--------|
.pipe_in("+-+a++--++b+---+c+d-e")
.succeeds()
.no_stderr()
// line 2 1 0
// |--------||----||---|
.stdout_is("+---+c+d-e+--++b+-+a+");
}