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authorYestin L. Harrison <yestin@ylh.io>2021-07-30 08:51:24 -0600
committerYestin L. Harrison <yestin@ylh.io>2021-07-30 08:51:24 -0600
commit44a123b749063b5d9a340a3b974a642d8135fb3a (patch)
treee1e7dbf680566c0856b517395917dc745a6115a7
downloadabout-filter-44a123b749063b5d9a340a3b974a642d8135fb3a.tar.gz
about-filter-44a123b749063b5d9a340a3b974a642d8135fb3a.tar.xz
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it works
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-rw-r--r--README.md14
-rw-r--r--src/main.rs50
5 files changed, 788 insertions, 0 deletions
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+ "unchecked-index",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ef1700b
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "about-filter"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+failure = "0.1.8"
+rst_parser = "0.4.0"
+rst_renderer = "0.4.0"
+comrak = "0.11.0"
+html-escape = "0.2.9"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8e18836
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+# about-filter
+
+[cgit](https://git.zx2c4.com/cgit/) expects a `README` formatter with a peculiar
+mode of operation, where it receives a “filename” as its first argument, but
+doesn't open it. Instead, it's meant to use it as a cue to determine the format,
+then read from standard input, on which cgit will provide the `README` it
+extracts from the repository by whatever magic `libgit` call. The included
+formatter is a shell script that makes further calls out to assorted python
+scripts. This replaces that whole mess with a single statically-linkable
+executable, so in your `cgitrc` you can write:
+
+ about-filter=/whatever/bin/about-filter
+
+and keep your `chroot` or container or what-have-you nice and small.
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..21cf2fd
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,50 @@
+use std::env;
+use std::ffi::OsStr;
+use std::io::{self, Read, Write};
+use std::path::Path;
+
+use comrak;
+use failure;
+use html_escape;
+use rst_parser;
+use rst_renderer;
+
+fn to_io(e: failure::Error) -> io::Error {
+ io::Error::new(io::ErrorKind::Other, e.to_string())
+}
+
+fn md<W: Write>(buf: &str, out: &mut W) -> io::Result<()> {
+ let s = comrak::markdown_to_html(buf, &comrak::ComrakOptions::default());
+ out.write(s.as_bytes()).map(|_| ())
+}
+
+fn rst<W: Write>(buf: &str, out: &mut W) -> io::Result<()> {
+ let d = rst_parser::parse(buf).map_err(to_io)?;
+ rst_renderer::render_html(&d, out, false).map_err(to_io)
+}
+
+fn cat<W: Write>(buf: &str, out: &mut W) -> io::Result<()> {
+ out.write(buf.as_bytes()).map(|_| ())
+}
+
+fn txt<W: Write>(buf: &str, out: &mut W) -> io::Result<()> {
+ out.write(b"<pre>")?;
+ html_escape::encode_safe_to_writer(buf, out)?;
+ out.write(b"</pre>").map(|_| ())
+}
+
+fn main() -> io::Result<()> {
+ let encoder = env::args().nth(1).as_ref()
+ .map(Path::new).and_then(Path::extension).and_then(OsStr::to_str)
+ .map(|s| match s.to_lowercase().as_str() {
+ "md" | "mkd" | "markdown" | "mdown" => md,
+ "rst" => rst,
+ "html" | "htm" => cat,
+ _ => txt
+ }).unwrap_or(txt);
+ let mut buf = String::new();
+
+ io::stdin().read_to_string(&mut buf)?;
+
+ encoder(&buf.as_str(), &mut io::stdout())
+}