melib: add datetime module

Datetime module adds POSIX time functions interface

9 files changed, 160 insertions, 45 deletions

diff --git a/melib/src/addressbook.rs b/melib/src/addressbook.rs
index 714d462c..3b592090 100644
--- a/melib/src/addressbook.rs
+++ b/melib/src/addressbook.rs
@@ -22,7 +22,7 @@
 #[cfg(feature = "vcard")]
 pub mod vcard;
 
-use chrono::{DateTime, Local};
+use crate::datetime::{self, UnixTimestamp};
 use fnv::FnvHashMap;
 use uuid::Uuid;
 
@@ -59,8 +59,8 @@ impl From<String> for CardId {
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 pub struct AddressBook {
     display_name: String,
-    created: DateTime<Local>,
-    last_edited: DateTime<Local>,
+    created: UnixTimestamp,
+    last_edited: UnixTimestamp,
     pub cards: FnvHashMap<CardId, Card>,
 }
 
@@ -73,13 +73,13 @@ pub struct Card {
     name_prefix: String,
     name_suffix: String,
     //address
-    birthday: Option<DateTime<Local>>,
+    birthday: Option<UnixTimestamp>,
     email: String,
     url: String,
     key: String,
 
     color: u8,
-    last_edited: DateTime<Local>,
+    last_edited: UnixTimestamp,
     extra_properties: FnvHashMap<String, String>,
 
     /// If true, we can't make any changes because we do not manage this resource.
@@ -90,8 +90,8 @@ impl AddressBook {
     pub fn new(display_name: String) -> AddressBook {
         AddressBook {
             display_name,
-            created: Local::now(),
-            last_edited: Local::now(),
+            created: datetime::now(),
+            last_edited: datetime::now(),
             cards: FnvHashMap::default(),
         }
     }
@@ -154,7 +154,7 @@ impl Card {
             url: String::new(),
             key: String::new(),
 
-            last_edited: Local::now(),
+            last_edited: datetime::now(),
             external_resource: false,
             extra_properties: FnvHashMap::default(),
             color: 0,
@@ -190,7 +190,7 @@ impl Card {
         self.key.as_str()
     }
     pub fn last_edited(&self) -> String {
-        self.last_edited.to_rfc2822()
+        datetime::timestamp_to_string(self.last_edited, None)
     }
 
     pub fn set_id(&mut self, new_val: CardId) {
diff --git a/melib/src/addressbook/vcard.rs b/melib/src/addressbook/vcard.rs
index 65488246..bc57e739 100644
--- a/melib/src/addressbook/vcard.rs
+++ b/melib/src/addressbook/vcard.rs
@@ -21,7 +21,6 @@
 
 /// Convert VCard strings to meli Cards (contacts).
 use super::*;
-use crate::chrono::TimeZone;
 use crate::error::{MeliError, Result};
 use crate::parsec::{match_literal_anycase, one_or_more, peek, prefix, take_until, Parser};
 use fnv::FnvHashMap;
@@ -202,7 +201,7 @@ impl<V: VCardVersion> TryInto<Card> for VCard<V> {
                       T102200Z
                       T102200-0800
                       */
-            card.birthday = chrono::Local.datetime_from_str(&val.value, "%Y%m%d").ok();
+            card.birthday = crate::datetime::timestamp_from_string(val.value.as_str(), "%Y%m%d");
         }
         if let Some(val) = self.0.remove("EMAIL") {
             card.set_email(val.value);
diff --git a/melib/src/datetime.rs b/melib/src/datetime.rs
new file mode 100644
index 00000000..7c56686f
--- /dev/null
+++ b/melib/src/datetime.rs
@@ -0,0 +1,131 @@
+/*
+ * meli - melib POSIX libc time interface
+ *
+ * Copyright 2020 Manos Pitsidianakis
+ *
+ * This file is part of meli.
+ *
+ * meli is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * meli is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with meli. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+use std::convert::TryInto;
+use std::ffi::{CStr, CString};
+
+pub type UnixTimestamp = u64;
+
+use libc::{timeval, timezone};
+
+extern "C" {
+    fn strptime(
+        s: *const ::std::os::raw::c_char,
+        format: *const ::std::os::raw::c_char,
+        tm: *mut ::libc::tm,
+    ) -> *const ::std::os::raw::c_char;
+
+    fn strftime(
+        s: *mut ::std::os::raw::c_char,
+        max: ::libc::size_t,
+        format: *const ::std::os::raw::c_char,
+        tm: *const ::libc::tm,
+    ) -> ::libc::size_t;
+
+    fn mktime(tm: *const ::libc::tm) -> ::libc::time_t;
+
+    fn localtime_r(timep: *const ::libc::time_t, tm: *mut ::libc::tm) -> *mut ::libc::tm;
+
+    fn gettimeofday(tv: *mut timeval, tz: *mut timezone) -> i32;
+}
+
+pub fn timestamp_to_string(timestamp: UnixTimestamp, fmt: Option<&str>) -> String {
+    let mut new_tm: ::libc::tm = unsafe { std::mem::zeroed() };
+    unsafe {
+        let i: i64 = timestamp.try_into().unwrap_or(0);
+        localtime_r(&i as *const i64, &mut new_tm as *mut ::libc::tm);
+    }
+    let fmt = fmt.map(|slice| CString::new(slice).unwrap());
+    let format: &CStr = if let Some(ref s) = fmt {
+        &s
+    } else {
+        unsafe { CStr::from_bytes_with_nul_unchecked(b"%a, %d %b %Y %T %z\0") }
+    };
+    let s: CString;
+    unsafe {
+        let mut vec: Vec<u8> = vec![0; 256];
+        let ret = strftime(
+            vec.as_mut_ptr() as *mut _,
+            256,
+            format.as_ptr(),
+            &new_tm as *const _,
+        );
+        s = CString::new(&vec[0..ret]).unwrap();
+    }
+
+    s.to_string_lossy().to_string()
+}
+
+pub fn rfc822_to_timestamp<T>(s: T) -> UnixTimestamp
+where
+    T: Into<Vec<u8>>,
+{
+    let mut new_tm: ::libc::tm = unsafe { std::mem::zeroed() };
+    unsafe {
+        let fmt = CStr::from_bytes_with_nul_unchecked(b"%a, %e %h %Y %H:%M:%S %z\0");
+        let ret = strptime(
+            CString::new(s).unwrap().as_ptr(),
+            fmt.as_ptr(),
+            &mut new_tm as *mut _,
+        );
+        if ret.is_null() {
+            return 0;
+        }
+        return mktime(&new_tm as *const _) as u64;
+    }
+}
+
+pub fn timestamp_from_string<T>(s: T, fmt: &str) -> Option<UnixTimestamp>
+where
+    T: Into<Vec<u8>>,
+{
+    let mut new_tm: ::libc::tm = unsafe { std::mem::zeroed() };
+    let fmt = CString::new(fmt).unwrap();
+    unsafe {
+        let ret = strptime(
+            CString::new(s).unwrap().as_ptr(),
+            fmt.as_ptr(),
+            &mut new_tm as *mut _,
+        );
+        if ret.is_null() {
+            return None;
+        }
+        return Some(mktime(&new_tm as *const _) as u64);
+    }
+}
+
+pub fn now() -> UnixTimestamp {
+    use std::mem::MaybeUninit;
+    let mut tv = MaybeUninit::<::libc::timeval>::uninit();
+    let mut tz = MaybeUninit::<::libc::timezone>::uninit();
+    unsafe {
+        let ret = gettimeofday(tv.as_mut_ptr(), tz.as_mut_ptr());
+        if ret == -1 {
+            unreachable!("gettimeofday returned -1");
+        }
+        (tv.assume_init()).tv_sec as UnixTimestamp
+    }
+}
+
+#[test]
+fn test_timestamp() {
+    timestamp_to_string(0);
+}
diff --git a/melib/src/email.rs b/melib/src/email.rs
index 48f7c76b..cab8565e 100644
--- a/melib/src/email.rs
+++ b/melib/src/email.rs
@@ -39,6 +39,7 @@ pub use address::*;
 pub mod signatures;
 
 use crate::backends::BackendOp;
+use crate::datetime::UnixTimestamp;
 use crate::error::{MeliError, Result};
 use crate::thread::ThreadHash;
 
@@ -51,9 +52,6 @@ use std::option::Option;
 use std::str;
 use std::string::String;
 
-use chrono;
-use chrono::TimeZone;
-
 bitflags! {
     #[derive(Default, Serialize, Deserialize)]
     pub struct Flag: u8 {
@@ -105,7 +103,6 @@ impl EnvelopeWrapper {
     }
 }
 
-pub type UnixTimestamp = u64;
 pub type EnvelopeHash = u64;
 
 /// `Envelope` represents all the data of an email we need to know.
@@ -350,14 +347,10 @@ impl Envelope {
         self.timestamp
     }
 
-    pub fn datetime(&self) -> chrono::DateTime<chrono::FixedOffset> {
-        if let Ok(d) = parser::date(&self.date.as_bytes()) {
-            return d;
-        }
-        chrono::FixedOffset::west(0)
-            .ymd(1970, 1, 1)
-            .and_hms(0, 0, 0)
+    pub fn datetime(&self) -> UnixTimestamp {
+        self.timestamp
     }
+
     pub fn date_as_str(&self) -> &str {
         &self.date
     }
@@ -572,8 +565,8 @@ impl Envelope {
     pub fn set_thread(&mut self, new_val: ThreadHash) {
         self.thread = new_val;
     }
-    pub fn set_datetime(&mut self, new_val: chrono::DateTime<chrono::FixedOffset>) {
-        self.timestamp = new_val.timestamp() as UnixTimestamp;
+    pub fn set_datetime(&mut self, new_val: UnixTimestamp) {
+        self.timestamp = new_val;
     }
     pub fn set_flag(
         &mut self,
diff --git a/melib/src/email/compose.rs b/melib/src/email/compose.rs
index 594ae1ba..47b24f86 100644
--- a/melib/src/email/compose.rs
+++ b/melib/src/email/compose.rs
@@ -2,7 +2,6 @@ use super::*;
 use crate::backends::BackendOp;
 use crate::email::attachments::AttachmentBuilder;
 use crate::shellexpand::ShellExpandTrait;
-use chrono::{DateTime, Local};
 use data_encoding::BASE64_MIME;
 use std::ffi::OsStr;
 use std::io::Read;
@@ -35,8 +34,10 @@ impl Default for Draft {
         headers.insert("Cc".into(), "".into());
         headers.insert("Bcc".into(), "".into());
 
-        let now: DateTime<Local> = Local::now();
-        headers.insert("Date".into(), now.to_rfc2822());
+        headers.insert(
+            "Date".into(),
+            crate::datetime::timestamp_to_string(crate::datetime::now(), None),
+        );
         headers.insert("Subject".into(), "".into());
         headers.insert(
             "User-Agent".into(),
diff --git a/melib/src/email/parser.rs b/melib/src/email/parser.rs
index 7a2aad28..b392f04e 100644
--- a/melib/src/email/parser.rs
+++ b/melib/src/email/parser.rs
@@ -19,7 +19,6 @@
  * along with meli. If not, see <http://www.gnu.org/licenses/>.
  */
 use super::*;
-use chrono;
 use data_encoding::BASE64_MIME;
 use encoding::{DecoderTrap, Encoding};
 use nom::{is_hex_digit, le_u8};
@@ -658,18 +657,13 @@ fn eat_comments(input: &[u8]) -> Vec<u8> {
  * right now we expect input will have no extra spaces in between tokens
  *
  * We should use a custom parser here*/
-pub fn date(input: &[u8]) -> Result<chrono::DateTime<chrono::FixedOffset>> {
+pub fn date(input: &[u8]) -> Result<UnixTimestamp> {
     let mut parsed_result = phrase(&eat_comments(input)).to_full_result()?;
     if let Some(pos) = parsed_result.find(b"-0000") {
         parsed_result[pos] = b'+';
     }
 
-    Ok(
-        chrono::DateTime::parse_from_rfc2822(
-            String::from_utf8_lossy(parsed_result.trim()).as_ref(),
-        )
-        .map_err(|err| MeliError::new(err.to_string()))?,
-    )
+    Ok(crate::datetime::rfc822_to_timestamp(parsed_result.trim()))
 }
 
 named!(pub message_id<&[u8]>,
diff --git a/melib/src/lib.rs b/melib/src/lib.rs
index 0ff5c75a..36cc0e72 100644
--- a/melib/src/lib.rs
+++ b/melib/src/lib.rs
@@ -104,6 +104,9 @@ pub mod dbg {
 #[cfg(feature = "unicode_algorithms")]
 extern crate text_processing;
 
+pub mod datetime;
+pub use datetime::UnixTimestamp;
+
 #[macro_use]
 mod logging;
 pub use self::logging::LoggingLevel::*;
@@ -129,7 +132,6 @@ extern crate serde_derive;
 /* parser */
 #[macro_use]
 extern crate nom;
-extern crate chrono;
 extern crate data_encoding;
 extern crate encoding;
 
diff --git a/melib/src/logging.rs b/melib/src/logging.rs
index 37985516..cef2fdb9 100644
--- a/melib/src/logging.rs
+++ b/melib/src/logging.rs
@@ -20,7 +20,6 @@
  */
 
 use crate::shellexpand::ShellExpandTrait;
-use chrono::offset::Local;
 use std::fs::OpenOptions;
 use std::io::{BufWriter, Write};
 use std::path::PathBuf;
@@ -79,7 +78,9 @@ pub fn log(val: String, level: LoggingLevel) {
         let mut b = f.lock().unwrap();
         if level <= b.level {
             b.dest
-                .write_all(Local::now().to_string().as_bytes())
+                .write_all(
+                    crate::datetime::timestamp_to_string(crate::datetime::now(), None).as_bytes(),
+                )
                 .unwrap();
             b.dest.write_all(b" [").unwrap();
             b.dest.write_all(level.to_string().as_bytes()).unwrap();
diff --git a/melib/src/thread.rs b/melib/src/thread.rs
index a1f2445c..9c8fdbfe 100644
--- a/melib/src/thread.rs
+++ b/melib/src/thread.rs
@@ -32,6 +32,7 @@
  * ownership.
  */
 
+use crate::datetime::UnixTimestamp;
 use crate::email::parser::BytesExt;
 use crate::email::*;
 use crate::structs::StackVec;
@@ -432,13 +433,6 @@ impl ThreadNode {
         self.date
     }
 
-    pub fn datetime(&self) -> chrono::DateTime<chrono::Utc> {
-        use chrono::{TimeZone, Utc};
-        use std::convert::TryInto;
-
-        Utc.timestamp(self.date.try_into().unwrap_or(0), 0)
-    }
-
     pub fn is_empty(&self) -> bool {
         self.parent.is_none() && self.message.is_none() && self.children.is_empty()
     }