Docopt -> clap, main.rs -> src/app

Modularise the old main function,
switch to clap for easier addition of CLI arguments

1 files changed, 226 insertions, 0 deletions

diff --git a/src/app/mod.rs b/src/app/mod.rs
new file mode 100644
index 0000000..50117e7
--- /dev/null
+++ b/src/app/mod.rs
@@ -0,0 +1,226 @@
+use clap::ArgMatches;
+
+use chrono::offset::fixed::FixedOffset;
+use chrono::naive::date::NaiveDate;
+
+use glob::glob;
+
+use std::process;
+use std::str::FromStr;
+use std::path::PathBuf;
+use std::io::{ self, Write, BufWriter, BufRead, BufReader };
+use std::fs::File;
+use std::error::Error;
+
+use ilc::context::Context;
+use ilc::format::{ self, Encode, Decode };
+
+use ::chain;
+
+pub mod freq;
+
+pub fn error(e: Box<Error>) -> ! {
+    let _ = writeln!(&mut io::stderr(), "Error: {}", e);
+    let mut e = e.cause();
+    while let Some(err) = e {
+        let _ = writeln!(&mut io::stderr(), "\t{}", err);
+        e = err.cause();
+    }
+    process::exit(1)
+}
+
+pub fn die(s: &str) -> ! {
+    let _ = writeln!(&mut io::stderr(), "Aborting: {}", s);
+    process::exit(1)
+}
+
+pub fn force_decoder(s: Option<&str>) -> Box<Decode> {
+    let inf = match s {
+        Some(s) => s,
+        None => die("You didn't specify the input format")
+    };
+    match format::decoder(&inf) {
+        Some(d) => d,
+        None => die(&format!("The format `{}` is unknown to me", inf))
+    }
+}
+
+pub fn force_encoder<'a>(s: Option<&str>) -> Box<Encode> {
+    let outf = match s {
+        Some(s) => s,
+        None => die("You didn't specify the output format")
+    };
+    match format::encoder(&outf) {
+        Some(e) => e,
+        None => die(&format!("The format `{}` is unknown to me", outf))
+    }
+}
+
+pub fn build_context(args: &ArgMatches) -> Context {
+    Context {
+        timezone: FixedOffset::west(args.value_of("timezone").and_then(|s| s.parse().ok()).unwrap_or(0)),
+        override_date: args.value_of("date").and_then(|d| NaiveDate::from_str(&d).ok()),
+        channel: args.value_of("channel").map(str::to_owned).clone()
+    }
+}
+
+pub fn build_input(args: &ArgMatches) -> Box<BufRead> {
+    let input_files = args.values_of("input_files");
+    if input_files.map(|files| files.count() > 0).unwrap_or(false) {
+        let input_files: Vec<PathBuf> = if let Some(iter) = args.values_of("input_files") {
+            iter.flat_map(|p| {
+                match glob(p) {
+                    Ok(paths) => paths,
+                    Err(e) => die(&format!("{}", e.msg))
+                }
+            }).filter_map(Result::ok).collect()
+        } else { Vec::new() };
+
+        /*if args.flag_infer_date {
+            if input_files.len() > 1 { die("Too many input files, can't infer date") }
+            if let Some(date) = input_files.iter().next()
+                .map(PathBuf::as_path)
+                .and_then(Path::file_stem)
+                .and_then(OsStr::to_str)
+                .and_then(|s: &str| NaiveDate::from_str(s).ok()) {
+                context.override_date = Some(date);
+            }
+        }*/
+
+        Box::new(BufReader::new(chain::Chain::new(input_files.iter().map(|p| File::open(p).unwrap()).collect())))
+    } else {
+        Box::new(BufReader::new(io::stdin()))
+    }
+}
+
+pub fn build_output(args: &ArgMatches) -> Box<Write> {
+    if let Some(out) = args.value_of("output_file") {
+        match File::create(out) {
+            Ok(f) => Box::new(BufWriter::new(f)),
+            Err(e) => error(Box::new(e))
+        }
+    } else {
+        Box::new(BufWriter::new(io::stdout()))
+    }
+}
+
+pub struct Environment<'a>(pub &'a ArgMatches<'a>);
+
+impl<'a> Environment<'a> {
+    pub fn context(&self) -> Context { build_context(self.0) }
+    pub fn input(&self) -> Box<BufRead> { build_input(self.0) }
+    pub fn output(&self) -> Box<Write> { build_output(self.0) }
+    pub fn decoder(&self) -> Box<Decode> { force_decoder(self.0.value_of("input_format")) }
+    pub fn encoder(&self) -> Box<Encode> { force_encoder(self.0.value_of("output_format")) }
+}
+
+pub mod parse {
+    use clap::ArgMatches;
+    use super::*;
+    pub fn parse(args: &ArgMatches) {
+        let env = Environment(args);
+        let (context, mut decoder, mut input) = (env.context(), env.decoder(), env.input());
+        for e in decoder.decode(&context, &mut input) {
+            match e {
+                Err(e) => { println!("Foo!"); error(Box::new(e)) },
+                _ => ()
+            }
+        }
+    }
+}
+
+pub mod convert {
+    use clap::ArgMatches;
+    use super::*;
+    pub fn convert(args: &ArgMatches) {
+        let env = Environment(args);
+        let (context, mut decoder, mut input, encoder, mut output) =
+            (env.context(), env.decoder(), env.input(), env.encoder(), env.output());
+
+        for e in decoder.decode(&context, &mut input) {
+            match e {
+                Ok(e) => { let _ = encoder.encode(&context, &mut output, &e); },
+                Err(e) => error(Box::new(e))
+            }
+        }
+    }
+}
+
+pub mod seen {
+    use clap::ArgMatches;
+    use ilc::event::Event;
+    use ilc::format::{ self, Encode };
+    use super::*;
+    pub fn seen(args: &ArgMatches) {
+        let env = Environment(args);
+        let (context, mut decoder, mut input, mut output) = (env.context(), env.decoder(), env.input(), env.output());
+
+        let nick = args.value_of("nick").expect("Required argument <nick> not present");
+
+        let mut last: Option<Event> = None;
+        for e in decoder.decode(&context, &mut input) {
+            let m = match e {
+                Ok(m) => m,
+                Err(err) => error(Box::new(err))
+            };
+
+            if m.ty.involves(nick)
+            && last.as_ref().map_or(true, |last| m.time.as_timestamp() > last.time.as_timestamp()) { last = Some(m) }
+        }
+        let encoder = format::weechat3::Weechat3;
+        if let Some(ref m) = last {
+            let _ = encoder.encode(&context, &mut output, m);
+        }
+    }
+}
+
+pub mod sort {
+    use clap::ArgMatches;
+    use ilc::event::Event;
+    use super::*;
+    pub fn sort(args: &ArgMatches) {
+        let env = Environment(args);
+        let (context, mut decoder, mut input, encoder, mut output) =
+            (env.context(), env.decoder(), env.input(), env.encoder(), env.output());
+
+        let mut events: Vec<Event> = decoder.decode(&context, &mut input)
+            .flat_map(Result::ok)
+            .collect();
+
+        events.sort_by(|a, b| a.time.cmp(&b.time));
+        for e in events {
+            let _ = encoder.encode(&context, &mut output, &e);
+        }
+    }
+}
+
+pub mod dedup {
+    use clap::ArgMatches;
+    use ilc::event::NoTimeHash;
+    use ::ageset::AgeSet;
+    use super::*;
+    pub fn dedup(args: &ArgMatches) {
+        let env = Environment(args);
+        let (context, mut decoder, mut input, encoder, mut output) =
+            (env.context(), env.decoder(), env.input(), env.encoder(), env.output());
+
+        let mut backlog = AgeSet::new();
+
+        for e in decoder.decode(&context, &mut input) {
+            if let Ok(e) = e {
+                let newest_event = e.clone();
+                backlog.prune(move |a: &NoTimeHash| {
+                    let age = newest_event.time.as_timestamp() - a.0.time.as_timestamp();
+                    age > 5000
+                });
+                // write `e` if it's a new event
+                let n = NoTimeHash(e);
+                if !backlog.contains(&n) {
+                    let _ = encoder.encode(&context, &mut output, &n.0);
+                    backlog.push(n);
+                }
+            }
+        }
+
+    }
+}