Add man page generation to bootstrap applet

src/cli.rs

@@ -1,8 +1,8 @@
 use crate::cmd::{bootstrap, echo, head, hostname, r#false, r#true, sleep};
 use clap::Command;
 
-pub fn run() {
-    let matches = Command::new("shitbox")
+pub fn cli() -> Command {
+    Command::new("shitbox")
         .about("The Harbor Freight multitool of embedded Linux")
         .version(env!("CARGO_PKG_VERSION"))
         .arg_required_else_help(true)
@@ -15,7 +15,10 @@ pub fn run() {
             sleep::cli(),
             r#true::cli(),
         ])
-        .get_matches();
+}
+
+pub fn run() {
+    let matches = cli().get_matches();
     match matches.subcommand() {
         Some(("echo", _matches)) => echo::run(),
         Some(("false", _matches)) => r#false::run(),

src/cmd/bootstrap/mod.rs

@@ -1,4 +1,18 @@
+use crate::cmd;
 use clap::{value_parser, Arg, ArgMatches, Command};
+use clap_mangen::Man;
+use std::{fs, io, path::PathBuf, process};
+
+const programs: [&str; 8] = [
+    "shitbox",
+    "bootstrap",
+    "echo",
+    "false",
+    "head",
+    "hostname",
+    "true",
+    "sleep",
+];
 
 #[must_use]
 pub fn cli() -> Command {
@@ -67,4 +81,48 @@ pub fn cli() -> Command {
         ])
 }
 
-pub fn run(matches: &ArgMatches) {}
+fn manpage(prefix: &str, cmd: &str) -> Result<(), io::Error> {
+    let (fname, cmd) = match cmd {
+        "shitbox" => ("shitbox.1", crate::cli::cli()),
+        "bootstrap" => ("shitbox-bootstrap.1", cli()),
+        "echo" => ("echo.1", cmd::echo::cli()),
+        "false" => ("false.1", cmd::r#false::cli()),
+        "head" => ("head.1", cmd::head::cli()),
+        "hostname" => ("hostname.1", cmd::hostname::cli()),
+        "true" => ("true.1", cmd::r#true::cli()),
+        "sleep" => ("sleep.1", cmd::sleep::cli()),
+        _ => unimplemented!(),
+    };
+    let outdir: PathBuf = [prefix, "usr", "share", "man", "man1"].iter().collect();
+    if !outdir.exists() {
+        fs::create_dir_all(&outdir)?;
+    }
+    let mut outfile = outdir;
+    outfile.push(fname);
+    let man = Man::new(cmd);
+    let mut buffer: Vec<u8> = vec![];
+    man.render(&mut buffer)?;
+    fs::write(&outfile, buffer)?;
+    println!("    {}", outfile.display());
+    Ok(())
+}
+
+fn manpages(prefix: &str) -> Result<(), io::Error> {
+    println!("Generating Unix man pages:");
+    programs.iter().try_for_each(|cmd| manpage(prefix, cmd))?;
+    Ok(())
+}
+
+pub fn run(matches: &ArgMatches) {
+    if let Some(prefix) = matches.get_one::<String>("prefix") {
+        match matches.subcommand() {
+            Some(("manpages", _matches)) => {
+                if let Err(e) = manpages(&prefix) {
+                    eprintln!("{e}");
+                    process::exit(1);
+                }
+            }
+            _ => {}
+        }
+    }
+}