From a2338dbb7ceea89440c124c32b3fff1b0f095d89 Mon Sep 17 00:00:00 2001
From: David 'Epper' Marshall <epper.marshall@gmail.com>
Date: Sat, 30 Apr 2022 05:31:23 -0400
Subject: [PATCH] docs: document more `builtin` functions/methods (#14229)

---
 examples/fibonacci.v       | 2 +-
 vlib/builtin/builtin.c.v   | 1 +
 vlib/builtin/int.v         | 3 +++
 vlib/builtin/js/builtin.v  | 6 ++++++
 vlib/builtin/option.v      | 3 +++
 vlib/encoding/csv/writer.v | 2 ++
 vlib/encoding/utf8/utf8.v  | 2 ++
 vlib/time/format.v         | 1 +
 8 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/examples/fibonacci.v b/examples/fibonacci.v
index 72e59c943..ddcabb872 100644
--- a/examples/fibonacci.v
+++ b/examples/fibonacci.v
@@ -22,7 +22,7 @@ fn main() {
 	mut a := i64(0)
 	mut b := i64(0)
 	mut c := i64(1)
-	println(a + c + c)
+	println(a + b + c)
 	for _ in 0 .. stop {
 		// Set a and b to the next term
 		a = b
diff --git a/vlib/builtin/builtin.c.v b/vlib/builtin/builtin.c.v
index 7a96816b1..bb0442cd0 100644
--- a/vlib/builtin/builtin.c.v
+++ b/vlib/builtin/builtin.c.v
@@ -64,6 +64,7 @@ fn panic_debug(line_no int, file string, mod string, fn_name string, s string) {
 	vhalt()
 }
 
+// panic_optional_not_set prints given optional not set and exits the process
 [noreturn]
 pub fn panic_optional_not_set(s string) {
 	panic('optional not set ($s)')
diff --git a/vlib/builtin/int.v b/vlib/builtin/int.v
index a387be5f4..8a27c1e09 100644
--- a/vlib/builtin/int.v
+++ b/vlib/builtin/int.v
@@ -17,14 +17,17 @@ pub fn ptr_str(ptr voidptr) string {
 	return buf1
 }
 
+// str returns string equivalent of x
 pub fn (x isize) str() string {
 	return i64(x).str()
 }
 
+// str returns string equivalent of x
 pub fn (x usize) str() string {
 	return u64(x).str()
 }
 
+// str returns string equivalent of cptr
 pub fn (cptr &char) str() string {
 	return u64(cptr).hex()
 }
diff --git a/vlib/builtin/js/builtin.v b/vlib/builtin/js/builtin.v
index b491f30ae..90d5e3e0c 100644
--- a/vlib/builtin/js/builtin.v
+++ b/vlib/builtin/js/builtin.v
@@ -22,6 +22,7 @@ pub interface IError {
 	code() int
 }
 
+// str returns the message of IError
 pub fn (err IError) str() string {
 	return match err {
 		None__ {
@@ -50,10 +51,12 @@ pub fn (err IError) str() string {
 // Error is the empty default implementation of `IError`.
 pub struct Error {}
 
+// msg returns the message of Error
 pub fn (err Error) msg() string {
 	return ''
 }
 
+// code returns the code of Error
 pub fn (err Error) code() int {
 	return 0
 }
@@ -65,10 +68,12 @@ pub:
 	code int
 }
 
+// msg returns the message of the MessageError
 pub fn (err MessageError) msg() string {
 	return err.msg
 }
 
+// code returns the code of MessageError
 pub fn (err MessageError) code() int {
 	return err.code
 }
@@ -88,6 +93,7 @@ pub struct Option {
 	err   IError = none__
 }
 
+// str returns the Option type: ok, none, or error
 pub fn (o Option) str() string {
 	if o.state == 0 {
 		return 'Option{ ok }'
diff --git a/vlib/builtin/option.v b/vlib/builtin/option.v
index d487595d8..444b5e3c1 100644
--- a/vlib/builtin/option.v
+++ b/vlib/builtin/option.v
@@ -13,6 +13,7 @@ pub interface IError {
 	code() int
 }
 
+// str returns the message of IError
 pub fn (err IError) str() string {
 	return match err {
 		None__ {
@@ -52,10 +53,12 @@ pub:
 	code int
 }
 
+// msg returns the message of MessageError
 pub fn (err MessageError) msg() string {
 	return err.msg
 }
 
+// code returns the code of MessageError
 pub fn (err MessageError) code() int {
 	return err.code
 }
diff --git a/vlib/encoding/csv/writer.v b/vlib/encoding/csv/writer.v
index b46c9d68e..c2bb0ced2 100644
--- a/vlib/encoding/csv/writer.v
+++ b/vlib/encoding/csv/writer.v
@@ -13,6 +13,7 @@ pub mut:
 	delimiter u8
 }
 
+// new_writer returns a reference to a Writer
 pub fn new_writer() &Writer {
 	return &Writer{
 		delimiter: `,`
@@ -75,6 +76,7 @@ fn (w &Writer) field_needs_quotes(field string) bool {
 	return false
 }
 
+// str returns the writer contents
 pub fn (mut w Writer) str() string {
 	return w.sb.str()
 }
diff --git a/vlib/encoding/utf8/utf8.v b/vlib/encoding/utf8/utf8.v
index d4e885e41..b7f819531 100644
--- a/vlib/encoding/utf8/utf8.v
+++ b/vlib/encoding/utf8/utf8.v
@@ -7,10 +7,12 @@ mut:
 	failed   bool
 }
 
+// validate_str reports if str consists of valid UTF-8 runes
 pub fn validate_str(str string) bool {
 	return validate(str.str, str.len)
 }
 
+// validate reports if data consists of valid UTF-8 runes
 pub fn validate(data &u8, len int) bool {
 	mut state := Utf8State{}
 	for i := 0; i < len; i++ {
diff --git a/vlib/time/format.v b/vlib/time/format.v
index 17c4d5116..baa141a68 100644
--- a/vlib/time/format.v
+++ b/vlib/time/format.v
@@ -85,6 +85,7 @@ const tokens_3 = ['MMM', 'DDD', 'ZZZ', 'ddd']
 const tokens_4 = ['MMMM', 'DDDD', 'DDDo', 'dddd', 'YYYY']
 
 // custom_format returns a date with custom format
+//
 // |  | Token  | Output |
 // | :-----------  | -------: | :--------- |
 // | Month   | M | 1 2 ... 11 12 |
-- 
2.30.2