Make inputs fail if not connected to a terminal (#261)

Author: mitsuhiko

src/prompts/confirm.rs

@@ -150,6 +150,10 @@ impl Confirm<'_> {
     }
 
     fn _interact_on(self, term: &Term, allow_quit: bool) -> Result<Option<bool>> {
+        if !term.is_term() {
+            return Err(io::Error::new(io::ErrorKind::NotConnected, "not a terminal").into());
+        }
+
         let mut render = TermThemeRenderer::new(term, self.theme);
 
         let default_if_show = if self.show_default {

src/prompts/input.rs

@@ -1,4 +1,4 @@
-use std::{cmp::Ordering, fmt::Debug, iter, str::FromStr};
+use std::{cmp::Ordering, fmt::Debug, io, iter, str::FromStr};
 
 use console::{Key, Term};
 
@@ -288,6 +288,10 @@ where
 
     /// Like [`interact_text`](Self::interact_text) but allows a specific terminal to be set.
     pub fn interact_text_on(mut self, term: &Term) -> Result<T> {
+        if !term.is_term() {
+            return Err(io::Error::new(io::ErrorKind::NotConnected, "not a terminal").into());
+        }
+
         let mut render = TermThemeRenderer::new(term, self.theme);
 
         loop {
@@ -639,6 +643,10 @@ where
 
     /// Like [`interact`](Self::interact) but allows a specific terminal to be set.
     pub fn interact_on(mut self, term: &Term) -> Result<T> {
+        if !term.is_term() {
+            return Err(io::Error::new(io::ErrorKind::NotConnected, "not a terminal").into());
+        }
+
         let mut render = TermThemeRenderer::new(term, self.theme);
 
         loop {

src/prompts/multi_select.rs

@@ -196,6 +196,10 @@ impl MultiSelect<'_> {
     }
 
     fn _interact_on(self, term: &Term, allow_quit: bool) -> Result<Option<Vec<usize>>> {
+        if !term.is_term() {
+            return Err(io::Error::new(io::ErrorKind::NotConnected, "not a terminal").into());
+        }
+
         if self.items.is_empty() {
             return Err(io::Error::new(
                 io::ErrorKind::Other,

src/prompts/password.rs

@@ -1,3 +1,5 @@
+use std::io;
+
 use console::Term;
 use zeroize::Zeroizing;
 
@@ -135,6 +137,10 @@ impl<'a> Password<'a> {
 
     /// Like [`interact`](Self::interact) but allows a specific terminal to be set.
     pub fn interact_on(self, term: &Term) -> Result<String> {
+        if !term.is_term() {
+            return Err(io::Error::new(io::ErrorKind::NotConnected, "not a terminal").into());
+        }
+
         let mut render = TermThemeRenderer::new(term, self.theme);
         render.set_prompts_reset_height(false);
 

src/prompts/select.rs

@@ -185,6 +185,10 @@ impl Select<'_> {
 
     /// Like `interact` but allows a specific terminal to be set.
     fn _interact_on(self, term: &Term, allow_quit: bool) -> Result<Option<usize>> {
+        if !term.is_term() {
+            return Err(io::Error::new(io::ErrorKind::NotConnected, "not a terminal").into());
+        }
+
         if self.items.is_empty() {
             return Err(io::Error::new(
                 io::ErrorKind::Other,

src/prompts/sort.rs

@@ -168,6 +168,10 @@ impl Sort<'_> {
     }
 
     fn _interact_on(self, term: &Term, allow_quit: bool) -> Result<Option<Vec<usize>>> {
+        if !term.is_term() {
+            return Err(io::Error::new(io::ErrorKind::NotConnected, "not a terminal").into());
+        }
+
         if self.items.is_empty() {
             return Err(io::Error::new(
                 io::ErrorKind::Other,