rs-web 0.4.2

A fast, Lua-driven static site generator with encryption support
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257

//! Date module (rs.date)

use chrono::{DateTime, Datelike, NaiveDate, NaiveDateTime, TimeZone, Timelike, Utc};
use mlua::{Lua, Result, Table, Value};

/// Parse a date/datetime from various input formats
fn parse_datetime(value: &Value) -> Option<NaiveDateTime> {
    match value {
        // Unix timestamp (seconds)
        Value::Integer(ts) => DateTime::from_timestamp(*ts, 0).map(|dt| dt.naive_utc()),
        Value::Number(ts) => DateTime::from_timestamp(*ts as i64, 0).map(|dt| dt.naive_utc()),

        // String formats
        Value::String(s) => {
            let s = s.to_str().ok()?.to_string();
            let s = s.as_str();
            // Try datetime formats first
            let datetime_formats = [
                "%Y-%m-%dT%H:%M:%S%.fZ", // ISO 8601 with Z
                "%Y-%m-%dT%H:%M:%SZ",    // ISO 8601 with Z (no frac)
                "%Y-%m-%dT%H:%M:%S%.f",  // ISO 8601 local
                "%Y-%m-%dT%H:%M:%S",     // ISO 8601 local (no frac)
                "%Y-%m-%d %H:%M:%S%.f",  // Space separated with frac
                "%Y-%m-%d %H:%M:%S",     // Space separated
                "%Y-%m-%d %H:%M",        // No seconds
                "%d/%m/%Y %H:%M:%S",     // European with time
                "%m/%d/%Y %H:%M:%S",     // US with time
            ];
            for fmt in datetime_formats {
                if let Ok(dt) = NaiveDateTime::parse_from_str(s, fmt) {
                    return Some(dt);
                }
            }
            // Try date-only formats (default to midnight)
            let date_formats = ["%Y-%m-%d", "%d/%m/%Y", "%m/%d/%Y", "%Y/%m/%d"];
            for fmt in date_formats {
                if let Ok(d) = NaiveDate::parse_from_str(s, fmt) {
                    return d.and_hms_opt(0, 0, 0);
                }
            }
            None
        }

        // Table format {year, month, day, hour?, min?, sec?}
        Value::Table(t) => {
            let year: i32 = t.get("year").unwrap_or(2000);
            let month: u32 = t.get("month").unwrap_or(1);
            let day: u32 = t.get("day").unwrap_or(1);
            let hour: u32 = t.get("hour").unwrap_or(0);
            let min: u32 = t.get("min").unwrap_or(0);
            let sec: u32 = t.get("sec").unwrap_or(0);
            NaiveDate::from_ymd_opt(year, month, day)?.and_hms_opt(hour, min, sec)
        }

        _ => None,
    }
}

/// Create datetime result table
fn create_datetime_table(lua: &Lua, dt: NaiveDateTime) -> Result<Table> {
    let result = lua.create_table()?;
    result.set("year", dt.year())?;
    result.set("month", dt.month())?;
    result.set("day", dt.day())?;
    result.set("hour", dt.hour())?;
    result.set("min", dt.minute())?;
    result.set("sec", dt.second())?;
    // Also include weekday (1=Monday, 7=Sunday)
    result.set("weekday", dt.weekday().number_from_monday())?;
    // Day of year (1-366)
    result.set("yday", dt.ordinal())?;
    Ok(result)
}

pub fn create_module(lua: &Lua) -> Result<Table> {
    let date = lua.create_table()?;

    // now() - Get current Unix timestamp
    let now_fn = lua.create_function(|_, ()| Ok(Utc::now().timestamp()))?;
    date.set("now", now_fn)?;

    // from_timestamp(ts) - Convert Unix timestamp to table
    let from_timestamp_fn =
        lua.create_function(|lua, ts: i64| match DateTime::from_timestamp(ts, 0) {
            Some(dt) => {
                let result = create_datetime_table(lua, dt.naive_utc())?;
                Ok(Value::Table(result))
            }
            None => Ok(Value::Nil),
        })?;
    date.set("from_timestamp", from_timestamp_fn)?;

    // to_timestamp(date) - Convert date/datetime to Unix timestamp
    let to_timestamp_fn =
        lua.create_function(|_, date_val: Value| match parse_datetime(&date_val) {
            Some(dt) => Ok(Value::Integer(Utc.from_utc_datetime(&dt).timestamp())),
            None => Ok(Value::Nil),
        })?;
    date.set("to_timestamp", to_timestamp_fn)?;

    // format(date, format) - Format a date/datetime string
    let format_fn = lua.create_function(|lua, (date_val, format): (Value, String)| {
        match parse_datetime(&date_val) {
            Some(dt) => {
                let formatted = dt.format(&format).to_string();
                Ok(Value::String(lua.create_string(&formatted)?))
            }
            None => Ok(Value::Nil),
        }
    })?;
    date.set("format", format_fn)?;

    // parse(str, format?) - Parse date/datetime string to table {year, month, day, hour, min, sec}
    let parse_fn = lua.create_function(|lua, (date_str, format): (String, Option<String>)| {
        let dt = if let Some(ref fmt) = format {
            // User-provided format
            NaiveDateTime::parse_from_str(&date_str, fmt)
                .ok()
                .or_else(|| {
                    // Try as date-only format, default to midnight
                    NaiveDate::parse_from_str(&date_str, fmt)
                        .ok()
                        .and_then(|d| d.and_hms_opt(0, 0, 0))
                })
        } else {
            // Auto-detect format
            parse_datetime(&Value::String(lua.create_string(&date_str)?))
        };

        match dt {
            Some(dt) => {
                let result = create_datetime_table(lua, dt)?;
                Ok(Value::Table(result))
            }
            None => Ok(Value::Nil),
        }
    })?;
    date.set("parse", parse_fn)?;

    // rss_format(date) - Format date for RSS feeds (RFC 2822)
    let rss_format_fn =
        lua.create_function(|lua, date_val: Value| match parse_datetime(&date_val) {
            Some(dt) => {
                let datetime = Utc.from_utc_datetime(&dt);
                let formatted = datetime.format("%a, %d %b %Y %H:%M:%S +0000").to_string();
                Ok(Value::String(lua.create_string(&formatted)?))
            }
            None => Ok(Value::Nil),
        })?;
    date.set("rss_format", rss_format_fn)?;

    // iso_format(date) - Format date as ISO 8601
    let iso_format_fn =
        lua.create_function(|lua, date_val: Value| match parse_datetime(&date_val) {
            Some(dt) => {
                let formatted = dt.format("%Y-%m-%dT%H:%M:%SZ").to_string();
                Ok(Value::String(lua.create_string(&formatted)?))
            }
            None => Ok(Value::Nil),
        })?;
    date.set("iso_format", iso_format_fn)?;

    // add(date, delta) - Add time to a date
    // delta = { years?, months?, days?, hours?, mins?, secs? }
    let add_fn = lua.create_function(|lua, (date_val, delta): (Value, Table)| {
        let dt = match parse_datetime(&date_val) {
            Some(dt) => dt,
            None => return Ok(Value::Nil),
        };

        let years: i32 = delta.get("years").unwrap_or(0);
        let months: i32 = delta.get("months").unwrap_or(0);
        let days: i64 = delta.get("days").unwrap_or(0);
        let hours: i64 = delta.get("hours").unwrap_or(0);
        let mins: i64 = delta.get("mins").unwrap_or(0);
        let secs: i64 = delta.get("secs").unwrap_or(0);

        // Add years and months
        let mut new_year = dt.year() + years;
        let mut new_month = dt.month() as i32 + months;

        // Handle month overflow/underflow
        while new_month > 12 {
            new_month -= 12;
            new_year += 1;
        }
        while new_month < 1 {
            new_month += 12;
            new_year -= 1;
        }

        // Clamp day to valid range for the new month
        let max_day = NaiveDate::from_ymd_opt(new_year, new_month as u32 + 1, 1)
            .unwrap_or_else(|| NaiveDate::from_ymd_opt(new_year + 1, 1, 1).unwrap())
            .pred_opt()
            .unwrap()
            .day();
        let new_day = dt.day().min(max_day);

        let new_date = match NaiveDate::from_ymd_opt(new_year, new_month as u32, new_day) {
            Some(d) => d,
            None => return Ok(Value::Nil),
        };

        let new_dt = match new_date.and_hms_opt(dt.hour(), dt.minute(), dt.second()) {
            Some(dt) => dt,
            None => return Ok(Value::Nil),
        };

        // Add days, hours, mins, secs using Duration
        let duration = chrono::Duration::days(days)
            + chrono::Duration::hours(hours)
            + chrono::Duration::minutes(mins)
            + chrono::Duration::seconds(secs);

        let final_dt = new_dt + duration;
        let result = create_datetime_table(lua, final_dt)?;
        Ok(Value::Table(result))
    })?;
    date.set("add", add_fn)?;

    // diff(date1, date2, opts?) - Get difference between two dates in seconds
    // opts: { format1?: string, format2?: string }
    let diff_fn =
        lua.create_function(|_, (date1, date2, opts): (Value, Value, Option<Table>)| {
            let format1: Option<String> = opts.as_ref().and_then(|t| t.get("format1").ok());
            let format2: Option<String> = opts.as_ref().and_then(|t| t.get("format2").ok());

            let parse_with_format = |val: &Value, fmt: &Option<String>| -> Option<NaiveDateTime> {
                if let Some(fmt) = fmt
                    && let Value::String(s) = val
                {
                    let s = s.to_str().ok()?.to_string();
                    return NaiveDateTime::parse_from_str(&s, fmt).ok().or_else(|| {
                        NaiveDate::parse_from_str(&s, fmt)
                            .ok()
                            .and_then(|d| d.and_hms_opt(0, 0, 0))
                    });
                }
                parse_datetime(val)
            };

            let dt1 = match parse_with_format(&date1, &format1) {
                Some(dt) => dt,
                None => return Ok(Value::Nil),
            };
            let dt2 = match parse_with_format(&date2, &format2.or(format1.clone())) {
                Some(dt) => dt,
                None => return Ok(Value::Nil),
            };
            let diff = dt1.signed_duration_since(dt2);
            Ok(Value::Integer(diff.num_seconds()))
        })?;
    date.set("diff", diff_fn)?;

    Ok(date)
}