From eb2f9c78a4698ccc2d09e5021fbf7155e49f561d Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Sat, 2 Nov 2019 20:48:40 +0100
Subject: Add a `--version` flag

---
 doc/pdf-urls.1     |  6 ++++++
 doc/pdf-urls.1.txt |  5 +++++
 src/main.rs        | 13 ++++++++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/doc/pdf-urls.1 b/doc/pdf-urls.1
index e58ad01..3e90edc 100644
--- a/doc/pdf-urls.1
+++ b/doc/pdf-urls.1
@@ -35,6 +35,12 @@ pdf-urls \- Extract URLs from a PDF file
 .SH "DESCRIPTION"
 .sp
 Extract all URLs from a PDF file and print them, one per line, to standard output\&.
+.SH "OPTIONS"
+.PP
+\-v, \-\-version
+.RS 4
+Print the program version\&.
+.RE
 .SH "EXAMPLES"
 .sp
 The following extracts URLs from the document \fIfile\&.pdf\fR and passes them to \fBurlview\fR to be opened in a browser:
diff --git a/doc/pdf-urls.1.txt b/doc/pdf-urls.1.txt
index 18ef69e..ddc2048 100644
--- a/doc/pdf-urls.1.txt
+++ b/doc/pdf-urls.1.txt
@@ -14,6 +14,11 @@ DESCRIPTION
 Extract all URLs from a PDF file and print them, one per line, to
 standard output.
 
+OPTIONS
+-------
+-v, --version::
+	Print the program version.
+
 EXAMPLES
 --------
 The following extracts URLs from the document 'file.pdf' and passes them
diff --git a/src/main.rs b/src/main.rs
index 9c1fd97..8f246b3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,8 +22,13 @@ use std::process;
 
 use pdf_urls::get_urls_from_pdf;
 
+const VERSION: &'static str = "0.0.1";
+
 fn print_usage() {
-    println!("usage: pdf-urls FILE");
+    println!(r#"usage: pdf-urls [<options>] FILE
+
+Options:
+    -v, --version       print the program version"#);
 }
 
 fn main() {
@@ -35,6 +40,12 @@ fn main() {
         process::exit(exitcode::USAGE);
     }
 
+    if args[1] == "-v" || args[1] == "--version" {
+        println!("{}", VERSION);
+
+        process::exit(exitcode::OK);
+    }
+
     match get_urls_from_pdf(&args[1]) {
         Ok(urls) => {
             for url in urls {
-- 
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