Add live watching and rendering of files

Cargo.lock

@@ -122,6 +122,17 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "filetime"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
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@@ -138,6 +149,37 @@ name = "fnv"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+ "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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@@ -176,11 +218,46 @@ dependencies = [
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+
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+dependencies = [
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+
 [[package]]
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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+
 [[package]]
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@@ -209,6 +286,14 @@ name = "linked-hash-map"
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+dependencies = [
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+
 [[package]]
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@@ -227,6 +312,73 @@ dependencies = [
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@@ -338,6 +490,11 @@ dependencies = [
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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@@ -402,9 +559,14 @@ name = "siphasher"
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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  "minify 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -546,6 +709,11 @@ dependencies = [
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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@@ -555,6 +723,11 @@ dependencies = [
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -573,6 +746,15 @@ name = "winapi-x86_64-pc-windows-gnu"
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+[[package]]
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+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "snekdown"
-version = "0.12.0"
+version = "0.12.1"
 authors = ["trivernis <trivernis@protonmail.com>"]
 edition = "2018"
 license-file = "LICENSE"
@@ -26,4 +26,5 @@ chrono = "0.4.11"
 regex = "1.3.9"
 lazy_static = "1.4.0"
 colored = "1.9.3"
-gh-emoji = "1.0.3"
+gh-emoji = "1.0.3"
+notify = "4.0.12"

README.md

@@ -7,18 +7,23 @@ for my needs.
 
 ```
 USAGE:
-    snekdown [OPTIONS] <input> <output>
+    snekdown [OPTIONS] <input> <output> [SUBCOMMAND]
 
 FLAGS:
     -h, --help       Prints help information
     -V, --version    Prints version information
 
 OPTIONS:
-    -f, --format <format>     [default: html]
+    -f, --format <format>    the output format [default: html]
 
 ARGS:
-    <input>     
+    <input>     Path to the input file
-    <output>
+    <output>    Path for the output file
+
+SUBCOMMANDS:
+    help      Prints this message or the help of the given subcommand(s)
+    render    Default. Parse and render the document
+    watch     Watch the document and its imports and render on change
 ```
 
 ## Syntax
@@ -168,7 +173,7 @@ The end goal is to have a markup language with features similar to LaTeX.
 - [x] Checkboxes
 - [x] Emojis (\:emoji:)
 - [x] Colors
-- [ ] Watching and rendering on change
+- [x] Watching and rendering on change
 - [ ] Metadata files
 - [ ] Bibliography
 - [ ] Math

src/main.rs

@@ -1,20 +1,39 @@
+use colored::Colorize;
+use notify::{watcher, RecursiveMode, Watcher};
 use snekdown::format::html::ToHtml;
 use snekdown::Parser;
 use std::fs::write;
-use std::time::Instant;
-
-use colored::Colorize;
 use std::path::PathBuf;
+use std::sync::mpsc::channel;
+use std::time::{Duration, Instant};
 use structopt::StructOpt;
 
 #[derive(StructOpt, Debug)]
 struct Opt {
+    /// Path to the input file
     #[structopt(parse(from_os_str))]
     input: PathBuf,
+
+    /// Path for the output file
     #[structopt(parse(from_os_str))]
     output: PathBuf,
+
+    /// the output format
     #[structopt(short, long, default_value = "html")]
     format: String,
+
+    #[structopt(subcommand)]
+    sub_command: Option<SubCommand>,
+}
+
+#[derive(StructOpt, Debug)]
+#[structopt()]
+enum SubCommand {
+    /// Watch the document and its imports and render on change.
+    Watch,
+
+    /// Default. Parse and render the document.
+    Render,
 }
 
 fn main() {
@@ -30,6 +49,34 @@ fn main() {
         );
         return;
     }
+
+    match &opt.sub_command {
+        Some(SubCommand::Render) | None => {
+            let _ = render(&opt);
+        }
+        Some(SubCommand::Watch) => watch(&opt),
+    };
+}
+
+/// Watches a file with all of its imports and renders on change
+fn watch(opt: &Opt) {
+    let parser = render(opt);
+    let (tx, rx) = channel();
+    let mut watcher = watcher(tx, Duration::from_millis(250)).unwrap();
+    for path in parser.get_paths() {
+        watcher.watch(path, RecursiveMode::NonRecursive).unwrap();
+    }
+    while let Ok(_) = rx.recv() {
+        println!("---");
+        let parser = render(opt);
+        for path in parser.get_paths() {
+            watcher.watch(path, RecursiveMode::NonRecursive).unwrap();
+        }
+    }
+}
+
+/// Renders the document to the output path
+fn render(opt: &Opt) -> Parser {
     let start = Instant::now();
     let mut parser = Parser::new_from_file(opt.input.to_str().unwrap().to_string()).unwrap();
     let document = parser.parse();
@@ -50,4 +97,6 @@ fn main() {
         "{}",
         format!("Total:            {:?}", start.elapsed()).italic()
     );
+
+    parser
 }

src/parsing/parser.rs

@@ -85,12 +85,18 @@ impl Parser {
         }
     }
 
+    /// Returns the text of the parser as a string
     fn get_text(&self) -> String {
         self.text
             .iter()
             .fold("".to_string(), |a, b| format!("{}{}", a, b))
     }
 
+    /// Returns the import paths of the parser
+    pub fn get_paths(&self) -> Vec<String> {
+        self.paths.lock().unwrap().clone()
+    }
+
     /// transform an import path to be relative to the current parsers file
     fn transform_path(&mut self, path: String) -> String {
         let mut path = path;