tsv -> format::tsv and add tests

1 files changed, 63 insertions, 0 deletions

diff --git a/format/tsv/writer.ha b/format/tsv/writer.ha
new file mode 100644
index 0000000..f1f045b
--- /dev/null
+++ b/format/tsv/writer.ha
@@ -0,0 +1,63 @@
+use io;
+use strings;
+use fmt;
+use memio;
+
+// Writes a slice strings to a handle in TSV format. Existing tabs in the record
+// are removed.
+export fn writerecord(w: io::handle, record: []str) (void | io::error) = {
+	let sep = "";
+	for (const field .. record) {
+		const pfield = strings::replace(field, "\t", "");
+		defer free(pfield);
+		fmt::fprintf(w, "{}{}", sep, pfield)!;
+		sep = "\t";
+	};
+	fmt::fprintln(w)!;
+};
+
+// Writes a slice of string slices to a handle in TSV format. Existing tabs in
+// the records are removed.
+export fn writerecords(w: io::handle, records: [][]str) (void | io::error) = {
+	for (const record .. records) {
+		writerecord(w, record)?;
+	};
+};
+
+@test fn writenormal() void = {
+	const expected = "col1\tcol2\tcol3
+1\t2\t3
+4\t5\t6\n";
+	const input: [][]str = [
+		["col1", "col2", "col3"],
+		["1", "2", "3"],
+		["4", "5", "6"],
+	];
+	const st = memio::dynamic();
+	defer io::close(&st)!;
+	writerecords(&st, input)!;
+	const actual = memio::string(&st)!;
+	fmt::errorfln("expected: {}EOF", expected)!;
+	fmt::errorln()!;
+	fmt::errorfln("actual: {}EOF", actual)!;
+	assert(actual == expected);
+};
+
+@test fn writetabs() void = {
+	const expected = "col1\tcol2\tcol3
+1\t2\t3
+4\t5\t6\n";
+	const input: [][]str = [
+		["col1\t", "co\tl2", "col3"],
+		["1", "2", "\t3"],
+		["4\t", "\t\t5\t", "6"],
+	];
+	const st = memio::dynamic();
+	defer io::close(&st)!;
+	writerecords(&st, input)!;
+	const actual = memio::string(&st)!;
+	fmt::errorfln("expected: {}EOF", expected)!;
+	fmt::errorln()!;
+	fmt::errorfln("actual: {}EOF", actual)!;
+	assert(actual == expected);
+};