Add feature for wrapping output

bin/core/imag-view/Cargo.toml

@@ -32,6 +32,7 @@ libimagstore     = { version = "0.8.0", path = "../../../lib/core/libimagstore"
 libimagrt        = { version = "0.8.0", path = "../../../lib/core/libimagrt" }
 libimagerror     = { version = "0.8.0", path = "../../../lib/core/libimagerror" }
 libimagentryview = { version = "0.8.0", path = "../../../lib/entry/libimagentryview" }
+libimagutil      = { version = "0.8.0", path = "../../../lib/etc/libimagutil" }
 
 [dependencies.clap]
 version = "^2.29"

bin/core/imag-view/src/main.rs

@@ -43,7 +43,9 @@ extern crate libimagentryview;
 extern crate libimagerror;
 #[macro_use] extern crate libimagrt;
 extern crate libimagstore;
+extern crate libimagutil;
 
+use std::str::FromStr;
 use std::collections::BTreeMap;
 use std::io::Write;
 use std::io::Read;
@@ -82,7 +84,6 @@ fn main() {
     let view_header  = rt.cli().is_present("view-header");
     let hide_content = rt.cli().is_present("not-view-content");
 
-
     if rt.cli().is_present("in") {
         let files = entry_ids
             .into_iter()
@@ -170,7 +171,19 @@ fn main() {
 
         drop(files);
     } else {
-        let viewer = StdoutViewer::new(view_header, !hide_content);
+        let mut viewer = StdoutViewer::new(view_header, !hide_content);
+
+        if rt.cli().is_present("autowrap") {
+            let width = rt.cli().value_of("autowrap").unwrap(); // ensured by clap
+            let width = usize::from_str(width).unwrap_or_else(|e| {
+                error!("Failed to parse argument to number: autowrap = {:?}",
+                       rt.cli().value_of("autowrap").map(String::from));
+                error!("-> {:?}", e);
+                ::std::process::exit(1)
+            });
+
+            viewer.wrap_at(width);
+        }
 
         entry_ids
             .into_iter()

bin/core/imag-view/src/ui.rs

@@ -40,6 +40,17 @@ pub fn build_ui<'a>(app: App<'a, 'a>) -> App<'a, 'a> {
                .args(&["id", "entries-from-stdin"])
                .required(true))
 
+        .arg(Arg::with_name("autowrap")
+            .long("autowrap")
+            .short("w")
+            .takes_value(true)
+            .required(false)
+            .multiple(false)
+            .value_name("WIDTH")
+            .default_value("80")
+            .validator(::libimagutil::cli_validators::is_integer)
+            .help("Automatically wrap long lines. Has only an effect when using stdout as output."))
+
         .arg(Arg::with_name("view-header")
             .long("header")
             .short("h")