feat: add rust-script

external/rust-script/tests/scripts/basic-eval.expected

@@ -0,0 +1,4 @@
+hello
+2
+3
+4

external/rust-script/tests/scripts/basic-eval.script

@@ -0,0 +1,7 @@
+#!/bin/sh
+set -e -u
+
+rust-script -e 'println!("hello");'
+rust-script -e '1+1'
+rust-script -e '1+2'
+rust-script -e '1+3'

external/rust-script/tests/scripts/loop-to-prefix.expected

@@ -0,0 +1,6 @@
+First:
+     1: line1
+     2: line2
+Second:
+     1: line1
+     2: line2

external/rust-script/tests/scripts/loop-to-prefix.script

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e -u
+
+echo "First:"
+echo "line1\nline2" | rust-script --loop \
+    "let mut n=0; move |l| {n+=1; println!(\"{:>6}: {}\",n,l.trim_right())}"
+
+echo "Second:"
+echo "line1\nline2" | rust-script --count --loop \
+    "|l,n| println!(\"{:>6}: {}\", n, l.trim_right())"

external/rust-script/tests/scripts/test-runner.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+set -e -u
+
+ANY_ERROR=0
+
+# Make sure newly built binary is first in PATH:
+cargo build &> /dev/null || {
+    echo "ERROR: Compilation failed"
+    exit 1
+}
+export PATH=$PWD/target/debug/:$PATH
+cd tests/scripts
+
+for TEST_SCRIPT in *.script; do
+  EXPECTED_STDOUT=${TEST_SCRIPT/.script/.expected}
+  ACTUAL_STDOUT=${TEST_SCRIPT/.script/.actual-stdout}
+  ACTUAL_STDERR=${TEST_SCRIPT/.script/.actual-stderr}
+  echo -n "Running $TEST_SCRIPT ... "
+
+  ./$TEST_SCRIPT > $ACTUAL_STDOUT 2> $ACTUAL_STDERR || {
+    ANY_ERROR=1
+    echo "Failed to run!"
+  }
+
+  if cmp -s "$EXPECTED_STDOUT" "$ACTUAL_STDOUT"; then
+    echo "Ok"
+  else
+    ANY_ERROR=1
+    echo "Failed!"
+    echo "######################## Expected:"
+    cat $EXPECTED_STDOUT
+    echo "######################## Actual:"
+    cat $ACTUAL_STDOUT
+    echo "######################## Error output:"
+    cat $ACTUAL_STDERR
+    echo "########################"
+  fi
+done
+
+exit $ANY_ERROR