Add time module to API (#284)

* Add time module to API

* Remove rej files

src/api/mod.rs

@@ -45,5 +45,6 @@ pub mod prompt;
 pub mod random;
 pub mod regex;
 pub mod syscall;
+pub mod time;
 pub mod vga;
 // TODO: add mod wildcard

src/api/time.rs

@@ -0,0 +1,23 @@
+use crate::sys;
+use crate::api::syscall;
+
+use time::{OffsetDateTime, Duration, UtcOffset};
+
+pub fn now() -> OffsetDateTime {
+    let s = syscall::realtime(); // Since Unix Epoch
+    let ns = Duration::nanoseconds(libm::floor(1e9 * (s - libm::floor(s))) as i64);
+    OffsetDateTime::from_unix_timestamp(s as i64).to_offset(offset()) + ns
+}
+
+pub fn from_timestamp(ts: i64) -> OffsetDateTime {
+    OffsetDateTime::from_unix_timestamp(ts).to_offset(offset())
+}
+
+fn offset() -> UtcOffset {
+    if let Some(tz) = sys::process::env("TZ") {
+        if let Ok(offset) = tz.parse::<i32>() {
+            return UtcOffset::seconds(offset);
+        }
+    }
+    UtcOffset::seconds(0)
+}

src/usr/date.rs

@@ -1,17 +1,11 @@
-use crate::{sys, usr};
-use crate::api::syscall;
-use time::{OffsetDateTime, Duration, UtcOffset};
+use crate::{api, usr};
+use time::validate_format_string;
 
 pub fn main(args: &[&str]) -> usr::shell::ExitCode {
-    let seconds = syscall::realtime(); // Since Unix Epoch
-    let nanoseconds = libm::floor(1e9 * (seconds - libm::floor(seconds))) as i64;
-    let date = OffsetDateTime::from_unix_timestamp(seconds as i64).to_offset(offset())
-             + Duration::nanoseconds(nanoseconds);
-
-    let format = if args.len() > 1 { args[1] } else { "%FT%H:%M:%S" };
-    match time::util::validate_format_string(format) {
+    let format = if args.len() > 1 { args[1] } else { "%F %H:%M:%S" };
+    match validate_format_string(format) {
         Ok(()) => {
-            println!("{}", date.format(format));
+            println!("{}", api::time::now().format(format));
             usr::shell::ExitCode::CommandSuccessful
         }
         Err(e) => {
@@ -20,12 +14,3 @@ pub fn main(args: &[&str]) -> usr::shell::ExitCode {
         }
     }
 }
-
-fn offset() -> UtcOffset {
-    if let Some(tz) = sys::process::env("TZ") {
-        if let Ok(offset) = tz.parse::<i32>() {
-            return UtcOffset::seconds(offset);
-        }
-    }
-    UtcOffset::seconds(0)
-}

src/usr/list.rs

@@ -1,8 +1,8 @@
 use crate::{sys, usr};
 use crate::api::console::Style;
+use crate::api::time;
 use alloc::string::ToString;
 use alloc::vec::Vec;
-use time::OffsetDateTime;
 
 pub fn main(args: &[&str]) -> usr::shell::ExitCode {
     let mut path: &str = &sys::process::dir();
@@ -59,7 +59,7 @@ pub fn main(args: &[&str]) -> usr::shell::ExitCode {
         let csi_reset = Style::reset();
 
         for file in files {
-            let date = OffsetDateTime::from_unix_timestamp(file.time() as i64);
+            let date = time::from_timestamp(file.time() as i64);
             let color = if file.is_dir() {
                 csi_dir_color
             } else if file.is_device() {