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-rw-r--r--src/backends/mod.rs14
-rw-r--r--src/backends/zenity.rs4
-rw-r--r--src/lib.rs12
3 files changed, 30 insertions, 0 deletions
diff --git a/src/backends/mod.rs b/src/backends/mod.rs
index 20cb8c1..f5af7ef 100644
--- a/src/backends/mod.rs
+++ b/src/backends/mod.rs
@@ -7,6 +7,9 @@ mod zenity;
pub use crate::backends::dialog::Dialog;
pub use crate::backends::zenity::Zenity;
+use std::env;
+use std::path;
+
use crate::Result;
/// A dialog backend.
@@ -32,6 +35,17 @@ pub trait Backend {
fn show_question(&self, question: &super::Question) -> Result<super::Choice>;
}
+pub(crate) fn is_available(name: &str) -> bool {
+ if let Ok(path) = env::var("PATH") {
+ for part in path.split(":") {
+ if path::Path::new(part).join(name).exists() {
+ return true;
+ }
+ }
+ }
+ false
+}
+
pub(crate) fn from_str(s: &str) -> Option<Box<dyn Backend>> {
match s.to_lowercase().as_ref() {
"dialog" => Some(Box::new(Dialog::new())),
diff --git a/src/backends/zenity.rs b/src/backends/zenity.rs
index 4bf862b..0730c64 100644
--- a/src/backends/zenity.rs
+++ b/src/backends/zenity.rs
@@ -59,6 +59,10 @@ impl Zenity {
self.timeout = Some(timeout.to_string());
}
+ pub(crate) fn is_available() -> bool {
+ super::is_available("zenity")
+ }
+
fn execute(&self, args: Vec<&str>, title: &Option<String>) -> Result<process::Output> {
let mut command = process::Command::new("zenity");
diff --git a/src/lib.rs b/src/lib.rs
index 3a6a090..80cabb5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -341,9 +341,13 @@ impl DialogBox for Question {
/// - If the `DIALOG` environment variable is set to a valid backend name, this backend is used.
/// A valid backend name is the name of a struct in the `backends` module implementing the
/// `Backend` trait in any case.
+/// - If the `DISPLAY` environment variable is set, the first available backend from this list is
+/// used:
+/// - [`Zenity`][]
/// - Otherwise, a [`Dialog`][] instance is returned.
///
/// [`Dialog`]: backends/struct.Dialog.html
+/// [`Zenity`]: backends/struct.Zenity.html
pub fn default_backend() -> Box<dyn backends::Backend> {
if let Ok(backend) = env::var("DIALOG") {
if let Some(backend) = backends::from_str(&backend) {
@@ -351,5 +355,13 @@ pub fn default_backend() -> Box<dyn backends::Backend> {
}
}
+ if let Ok(display) = env::var("DISPLAY") {
+ if !display.is_empty() {
+ if backends::Zenity::is_available() {
+ return Box::new(backends::Zenity::new());
+ }
+ }
+ }
+
Box::new(backends::Dialog::new())
}