From efab5cde8ebdd65d60c44e0e0da43a63bebb87b1 Mon Sep 17 00:00:00 2001
From: Thomas Levine <_@thomaslevine.com>
Date: Sun, 28 Feb 2016 16:53:49 +0000
Subject: [PATCH] shell cycling

---
 urchin | 40 +++++++++++++++++++++++++---------------
 1 file changed, 25 insertions(+), 15 deletions(-)

diff --git a/urchin b/urchin
index 9597678..de0b80b 100755
--- a/urchin
+++ b/urchin
@@ -145,19 +145,13 @@ recurse() {
       # Determine the environment variable to define for test scripts
       # that reflects the specified or implied shell to use for shell-code tests.
       while read the_test_shell; do
-        if test -n "$the_test_shell"; then
-          if has_sh_or_no_shebang_line "$potential_test"; then
-            the_exec=$the_test_shell
-          else
-            the_exec=exec
-          fi
-        else
+        if test -z "$the_test_shell"; then
           # Shell cycling is disabled with -n; use the present value of
           # TEST_SHELL or default to /bin/sh
           if [ -n "$TEST_SHELL" ]; then
             the_test_shell="$TEST_SHELL"
           else
-            the_test_shell='/bin/sh'
+            the_test_shell=/bin/sh
           fi
         fi
         (
@@ -166,8 +160,15 @@ recurse() {
           # Run the test
           start=$(date +%s)
           set +e
-          TEST_SHELL="$the_test_shell" "$the_exec" "$potential_test" >> \
-            "$(stdout_file "$potential_test")" 2>&1
+          { 
+            if $cycle_shell &&
+              has_sh_or_no_shebang_line "$potential_test"; then
+              TEST_SHELL="$the_test_shell" "$the_test_shell" \
+                "$potential_test"
+            else
+              TEST_SHELL="$the_test_shell" "$potential_test"
+            fi
+          } > "$(stdout_file "$potential_test")" 2>&1
           exit_code="$?"
           set -e
           finish=$(date +%s)
@@ -462,13 +463,22 @@ do
     shift
 done
 
+if $cycle_shell && test -f "$shell_list"; then
+  echo "The -n/--disable-cycling and -s/--shell options clash with each other." >&2
+  urchin_exit 11
+fi
+
 # If -s was not passed, use the available default shells.
 if ! test -f "$shell_list"; then
-  for shell in $DEFAULT_SHELLS; do
-    if which $shell > /dev/null; then
-      echo $shell >> "$shell_list"
-    fi
-  done
+  if $cycle_shell; then
+    for shell in $DEFAULT_SHELLS; do
+      if which $shell > /dev/null; then
+        echo $shell >> "$shell_list"
+      fi
+    done
+  else
+    echo > "$shell_list"
+  fi
 fi
 
 # Verify argument for main stuff