Ensures "no pipe" and "terminal" in evaluation

lib/core/evaluation.sh

@@ -4,14 +4,17 @@ SHELLSPEC_STDIN_FILE="$SHELLSPEC_TMPBASE/$$.stdin"
 SHELLSPEC_STDOUT_FILE="$SHELLSPEC_TMPBASE/$$.stdout"
 SHELLSPEC_STDERR_FILE="$SHELLSPEC_TMPBASE/$$.stderr"
 
+SHELLSPEC_STDIN_DEV=/dev/null
+(: < /dev/tty) 2>/dev/null && SHELLSPEC_STDIN_DEV=/dev/tty
+
 shellspec_syntax 'shellspec_evaluation_call'
 shellspec_syntax 'shellspec_evaluation_run'
 
 shellspec_proxy 'shellspec_evaluation' 'shellspec_syntax_dispatch evaluation'
 
 shellspec_evaluation_call() {
   if [ ! "${SHELLSPEC_DATA:-}" ]; then
-    shellspec_around_call "$@"
+    shellspec_around_call "$@" < "$SHELLSPEC_STDIN_DEV"
   else
     shellspec_data > "$SHELLSPEC_STDIN_FILE"
     shellspec_around_call "$@" < "$SHELLSPEC_STDIN_FILE"
@@ -42,7 +45,7 @@ fi
 
 shellspec_evaluation_run_data() {
   if [ ! "${SHELLSPEC_DATA:-}" ]; then
-    shellspec_evaluation_run_trap_exit_status "$@"
+    shellspec_evaluation_run_trap_exit_status "$@" < "$SHELLSPEC_STDIN_DEV"
   else
     shellspec_data > "$SHELLSPEC_STDIN_FILE"
     shellspec_evaluation_run_trap_exit_status "$@" < "$SHELLSPEC_STDIN_FILE"

spec/core/evaluation_spec.sh

@@ -63,6 +63,18 @@ Describe "core/evaluation.sh"
       The stdout should equal "1${LF}2"
       The status should equal 0
     End
+
+    It "ensures no pipe and term"
+      evaluation() {
+        [ -p /dev/stdin ] && echo "pipe" || echo "no pipe"
+        [ -t 0 ] && echo "term" || echo "no term"
+      }
+      term() { exists_tty && echo "term" || echo "no term"; }
+
+      When call evaluation
+      The line 1 of stdout should equal 'no pipe'
+      The line 2 of stdout should equal "$(term)"
+    End
   End
 
   Describe 'run evaluation'
@@ -117,6 +129,18 @@ Describe "core/evaluation.sh"
       The stdout should equal 'data'
     End
 
+    It "ensures no pipe and term"
+      evaluation() {
+        [ -p /dev/stdin ] && echo "pipe" || echo "no pipe"
+        [ -t 0 ] && echo "term" || echo "no term"
+      }
+      term() { exists_tty && echo "term" || echo "no term"; }
+
+      When run evaluation
+      The line 1 of stdout should equal 'no pipe'
+      The line 2 of stdout should equal "$(term)"
+    End
+
     Describe 'abort test'
       Skip if 'shell flag handling broken' [ "$SHELLSPEC_DEFECT_SHELL_FLAG" ]
       evaluation() { set -e; echo line1; "$BIN/exit.sh" 12; echo line2; }

spec/spec_helper.sh

@@ -86,4 +86,9 @@ shellspec_spec_helper_configure() {
     shopt -s failglob 2>/dev/null && return 1
     return 0
   }
+
+  exists_tty() {
+    (: < /dev/tty) 2>/dev/null
+  }
+
 }