add + indent symbol so directories line up

I'm on NixOS, so awk isn't in /usr/bin. I can search for it with
/usr/bin/env, but then I can't use -f in the shebang line.

cross-shell-tests

@@ -6,7 +6,7 @@ for shell in dash bash ksh zsh; do
   if which $shell > /dev/null 2> /dev/null; then
     echo
     echo Running urchin tests in $shell
-    $shell urchin tests | tail -n 3
+    $shell urchin -s $shell tests | tail -n 3
   else
     echo
     echo Skipping $shell because it is not in the PATH

tests/Cross-shell test support/.test-run-by-specified-shell/With -s, a non-sh test script should be invoked directly.

@@ -1,5 +1,3 @@
-#!/usr/bin/awk -f
-
-# This script will only succeed if it is indeed processed by awk.
-
-BEGIN { print "ok" }
+#!/usr/bin/env true
+true will processed the contents of this script, but that
+means that nothing will happen and the script will exit 0 

tests/Cross-shell test support/The -s option should invoke tests with the specified shell.

@@ -3,6 +3,5 @@
 # Tests the `-s <shell> option, which invokes shebang-less and sh-shebang-line test scripts with the specified shell (for testing *sourced* shell code).
 
 which bash >/dev/null || { echo "Cannot test -s option: bash cannot be located." >&2; exit 2; }
-which /usr/bin/awk >/dev/null || { echo "Cannot test -s option: /usr/bin/awk not found." >&2; exit 2; }
 
 ../../urchin -s bash ./.test-run-by-specified-shell

tests/TAP/.expected-output

@@ -0,0 +1,10 @@
+# Begin - .testsuite/
+not ok 1 - a
+# ------------ Begin output ------------
+# This is stdout from a.
+# ------------ End output ------------
+ok 2 - b
+ok 3 - # SKIP c
+# End - .testsuite/
+# Took 0 seconds.
+1..3

tests/TAP/.testsuite/a

@@ -0,0 +1,4 @@
+#!/bin/sh
+echo This is stderr from a. > /dev/stderr
+echo This is stdout from a. > /dev/stdout
+false

tests/TAP/.testsuite/b

@@ -0,0 +1,4 @@
+#!/bin/sh
+echo This is stderr from b. > /dev/stderr
+echo This is stdout from b. > /dev/stdout
+true

tests/TAP/.testsuite/c

@@ -0,0 +1 @@
+This should not be run.

tests/TAP/Running with -t should produce TAP output.

@@ -0,0 +1,4 @@
+tmp=$(mktemp)
+
+../../urchin -t .testsuite/ | sed 1d > $tmp
+diff $tmp .expected-output

tests/urchin -x should start the $TEST_SHELL.

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-test c = $(../urchin -x .print-arg-3 a 'b b b b' c d e)

urchin

@@ -30,9 +30,16 @@ recurse() {
 
   if [ -d "$potential_test" ]
     then
-    (
+
+    if $tap_format; then
+      indent $indent_level | sed 's/  /#/g'
+      echo "# Begin - ${potential_test}"
+    else
       indent $indent_level
-      echo "  ${potential_test}"
+      echo "+ ${potential_test}"
+    fi
+
+    (
       cd -- "$potential_test"
       [ -f setup_dir ] && [ -x setup_dir ] && ./setup_dir >> "$stdout_file"
 
@@ -51,40 +58,79 @@ recurse() {
         [ -f teardown ] && [ -x teardown ] && ./teardown >> "$stdout_file"
       done
       [ -f teardown_dir ] && [ -x teardown_dir ] && ./teardown_dir >> "$stdout_file"
-      echo
     )
-  elif [ -x "$potential_test" ]
-    then
-
-    [ -f setup ] && [ -x setup ] && ./setup >> "$stdout_file"
-
-    # Run the test
-    if [ -n "$shell_for_sh_tests" ] && has_sh_or_no_shebang_line ./"$potential_test"
-      then    
-      TEST_SHELL="$TEST_SHELL" "$shell_for_sh_tests" ./"$potential_test" > "$stdout_file" 2>&1
+    if $tap_format; then
+      indent $indent_level | sed 's/  /#/g'
+      echo "# End - ${potential_test}"
     else
-      TEST_SHELL="$TEST_SHELL" ./"$potential_test" > "$stdout_file" 2>&1
+      echo
     fi
-    exit_code="$?"
-
-
-    [ -f teardown ] && [ -x teardown ] && ./teardown >> "$stdout_file"
-
-    indent $indent_level
-    if [ $exit_code -eq 0 ]
+  else
+    if [ -x "$potential_test" ]
       then
-      # On success, print a green '✓'
-      printf '\033[32m✓ \033[0m'
-      printf '%s\n' "${potential_test}"
-      printf '%s\n' "${potential_test} passed" >> "$logfile"
+
+      [ -f setup ] && [ -x setup ] && ./setup >> "$stdout_file"
+
+      # Run the test
+      if [ -n "$shell_for_sh_tests" ] && has_sh_or_no_shebang_line ./"$potential_test"
+        then    
+        TEST_SHELL="$TEST_SHELL" "$shell_for_sh_tests" ./"$potential_test" > "$stdout_file" 2>&1
+      else
+        TEST_SHELL="$TEST_SHELL" ./"$potential_test" > "$stdout_file" 2>&1
+      fi
+      exit_code="$?"
+
+
+      [ -f teardown ] && [ -x teardown ] && ./teardown >> "$stdout_file"
+      if [ $exit_code -eq 0 ]; then
+        result=success
+      else
+        result=fail
+      fi
     else
-      # On fail, print a red '✗'
-      printf '\033[31m✗ \033[0m'
-      printf '%s\n' "${potential_test}"
-      printf '%s\n' "${potential_test} failed" >> "$logfile"
-      printf '\033[31m' # Print output captured from failed test in red.
-      cat "$stdout_file"
-      printf '\033[0m'
+      result=skip
+    fi
+
+    echo "${result}" >> "$logfile"
+    if $tap_format; then
+      n=$(grep -ce '^\(success\|fail\|skip\)' "$logfile")
+
+      if [ "$result" == fail ]; then
+        not='not '
+      else
+        not=''
+      fi
+      if [ "$result" == skip ]; then
+        skip='# SKIP '
+      else
+        skip=''
+      fi
+      echo "${not}ok $n - ${skip}${potential_test}"
+      if [ "$result" == fail ]; then
+        echo '# ------------ Begin output ------------'
+        sed 's/^/# /' "$stdout_file"
+        echo '# ------------ End output ------------'
+      fi
+    else
+      indent $indent_level
+      case "$result" in
+        success)
+          # On success, print a green '✓'
+          printf '\033[32m✓ \033[0m'
+          printf '%s\n' "${potential_test}"
+        ;;
+        fail)
+          # On fail, print a red '✗'
+          printf '\033[31m✗ \033[0m'
+          printf '%s\n' "${potential_test}"
+          printf '\033[31m' # Print output captured from failed test in red.
+          cat "$stdout_file"
+          printf '\033[0m'
+        ;;
+        skip)
+          printf '  %s\n' "${potential_test}"
+        ;;
+      esac
     fi
   fi
   [ $indent_level -eq 0 ] && rm "$stdout_file"
@@ -107,15 +153,12 @@ $USAGE
             have shebang line "#!/bin/sh" with the specified shell.
 -f          Force running even if the test directory's name does not
             contain the word "test".
+-t          Format output in Test Anything Protocol (TAP)
 -h          This help.
 
 Go to https://github.com/tlevine/urchin for documentation on writing tests.
 
 EOF
-  # [Experimental -x option left undocumented for now.]
-  # -x          [Experimental; not meant for direct invocation, but for use in
-  #             the shebang line of test scripts]
-  #             Run with "\$TEST_SHELL", falling back on /bin/sh.
 }
 
 plural () {
@@ -131,7 +174,11 @@ plural () {
 }
 
 urchin_go() {
-  echo Running tests at $(date +%Y-%m-%dT%H:%M:%S) | tee "$logfile"
+  rm -f "$logfile"
+  if "$tap_format"; then
+    printf \#\ 
+  fi
+  echo Running tests at $(date +%Y-%m-%dT%H:%M:%S)
   start=$(date +%s)
 
   # Determine the environment variable to define for test scripts
@@ -151,13 +198,23 @@ urchin_go() {
 
   finish=$(date +%s)
   elapsed=$(($finish - $start))
-  echo "Done, took $elapsed $(plural second $elapsed)."
-  set -- $(grep -e 'passed$' "$logfile"|wc -l) $(grep -e 'failed$' "$logfile"|wc -l)
-  printf '%s\n' "$1 $(plural test "$1") passed."
-  [ $2 -gt 0 ] && printf '\033[31m' || printf '\033[32m' # If tests failed, print the message in red, otherwise in green.
-  printf '%s\n' "$2 $(plural test "$2") failed."
-  printf '\033[m'
-  return "$2"
+
+  passed=$(grep -c '^success' "$logfile")
+  failed=$(grep -c '^fail' "$logfile")
+  skipped=$(grep -c '^skip' "$logfile")
+  if $tap_format; then
+    echo "# Took $elapsed $(plural second $elapsed)."
+    echo 1..$(($passed + $failed + $skipped))
+  else
+    echo "Done, took $elapsed $(plural second $elapsed)."
+    printf '%s\n' "$passed $(plural test "$passed") passed."
+    printf '%s\n' "$skipped $(plural test "$skipped") skipped."
+    [ $failed -gt 0 ] && printf '\033[31m' || printf '\033[32m' # If tests failed, print the message in red, otherwise in green.
+    printf '%s\n' "$failed $(plural test "$failed") failed."
+    printf '\033[m'
+  fi
+  rm -f "$logfile"
+  test -z "$failed" || test "$failed" -eq '0'
 }
 
 urchin_molly_guard() {
@@ -174,6 +231,7 @@ urchin_molly_guard() {
 
 shell_for_sh_tests=
 force=false
+tap_format=false
 while [ $# -gt 0 ]
 do
     case "$1" in
@@ -183,11 +241,7 @@ do
           shell_for_sh_tests=$1
           which "$shell_for_sh_tests" >/dev/null || { echo "Cannot find specified shell: '$shell_for_sh_tests'" >&2; urchin_help >&2; exit 2; }
           ;;
-        -x) # [EXPERIMENTAL; UNDOCUMENTED FOR NOW] `urchin -x <test-script>` in a test script's shebang line is equivalent to invoking that script with `"$TEST_SHELL" <test-script>`
-          shift
-          urchinsh=${TEST_SHELL:-/bin/sh}
-          "$urchinsh" "$@"
-          exit $?;;
+        -t) tap_format=true;;
         -h|--help) urchin_help
           exit 0;;
         -*) urchin_help >&2