Show manuals with command line arguments

Add --manual, --conf-manual command line arguments that display manpages
through a pager. If no pager is found, this currently fails. It should
print the manuals to stdout instead.

The manuals are read from src/manuals and are generated with mandoc
whenever changes to the manpage sources meli.1 and meli.conf.5 are made.

1 files changed, 52 insertions, 0 deletions

diff --git a/build.rs b/build.rs
new file mode 100644
index 00000000..95e16179
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,52 @@
+/*
+ * meli - bin.rs
+ *
+ * Copyright 2019 Manos Pitsidianakis
+ *
+ * This file is part of meli.
+ *
+ * meli is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * meli is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with meli. If not, see <http://www.gnu.org/licenses/>.
+ */
+use std::fs::File;
+use std::io::prelude::*;
+use std::io::BufWriter;
+use std::path::PathBuf;
+use std::process::Command;
+
+fn main() -> Result<(), std::io::Error> {
+    if let Err(e) = std::fs::create_dir("src/manuals") {
+        if e.kind() != std::io::ErrorKind::AlreadyExists {
+            Err(e)?;
+        }
+    }
+    let meli_1_metadata = std::fs::metadata("meli.1")?;
+    if let Ok(metadata) = std::fs::metadata("src/manuals/meli.txt") {
+        if metadata.modified()? < meli_1_metadata.modified()? {
+            let output = Command::new("mandoc").args(&["meli.1"]).output()?;
+            let man_path = PathBuf::from("src/manuals/meli.txt");
+            let file = File::create(&man_path)?;
+            BufWriter::new(file).write_all(&output.stdout)?;
+        }
+    }
+    let meli_conf_5_metadata = std::fs::metadata("meli.conf.5")?;
+    if let Ok(metadata) = std::fs::metadata("src/manuals/meli_conf.txt") {
+        if metadata.modified()? < meli_conf_5_metadata.modified()? {
+            let output = Command::new("mandoc").args(&["meli.conf.5"]).output()?;
+            let man_path = PathBuf::from("src/manuals/meli_conf.txt");
+            let file = File::create(&man_path)?;
+            BufWriter::new(file).write_all(&output.stdout)?;
+        }
+    }
+    Ok(())
+}