[osh2oil] Change the translation of 'case' to Oil's 'match with'.

- Also, add translation tests for pattern matching.
- Fix some cases about the argv array.  Probably need another pass.

test/osh2oil.sh

@@ -80,15 +80,22 @@ OIL

arg-array() {
  # Only "$@" goes to @Argv
  # "__$@__" goes "$join(Argv)__"
  # "__$@__" should be
  #
  # "__$Argv[0]" @Argv[1:-1] "$Argv[-1]__"
  # 
  # But this is probably too rare to really happen.  Just remove it.

  # Yeah the rest go to $join(Argv)
  # does join respect IFS though?  Have to work that out.
  # or maybe $ifsjoin(Argv) -- make explicit the global variable.

  # NOTE: This is with autosplit?  What about without splitting?

  osh0-oil3 << 'OSH' 3<< 'OIL'
echo $@ $* "$@" "$*" "__$@__" "__$*__"
OSH
echo $Status $len(Argv) @Argv
echo $ifsjoin(Argv) $ifsjoin(Argv) @Argv "$ifsjoin(Argv)" "__$ifsjoin(Argv)__" "__$ifsjoin(Argv)__"
OIL
}

@@ -791,6 +798,8 @@ if true {
OIL
}

# TODO: This should match $foo with ...

case_() {
  osh0-oil3 << 'OSH' 3<< 'OIL'
case $var in
@@ -802,13 +811,13 @@ case $var in
    ;;
esac
OSH
matchstr $var {
  foo|bar {
match $var {
  with foo|bar
    test -f foo && echo file
    }
  * {
    
  with *
    echo default
    }
    
}
OIL

@@ -819,11 +828,10 @@ case "$var" in
    echo bar  # no dsemi
esac
OSH
matchstr $var {
  * {
match $var {
  with *
    echo foo
    echo bar  # no dsemi
    }
}
OIL
}
@@ -962,7 +970,45 @@ echo $(( a << 1 .| b .& 1 ))
OIL
}

# newerThan, olderThan, etc.
dbracket-pattern() {
  osh0-oil3 << 'OSH' 3<< 'OIL'
if [[ $foo == *.py ]]; then
  echo Python
fi
OSH
if (foo ~ *.py) {
  echo Python
}
OIL

  # Negated match
  osh0-oil3 << 'OSH' 3<< 'OIL'
if [[ $foo != *.py ]]; then
  echo Python
fi
OSH
if (foo !~ *.py) {
  echo Python
}
OIL

  osh0-oil3 << 'OSH' 3<< 'OIL'
regex='.*\.py'
if [[ $foo =~ $regex ]]; then
  echo Python
fi
OSH
setglobal regex = '.*\.py'
if (foo ~ ERE/$regex/) {
  echo Python
}
OIL
}

# Honestly test -dir /  is OK?
#
# What about newerThan, olderThan, etc.

dbracket() {
  osh0-oil3 << 'OSH' 3<< 'OIL'
[[ -d / ]] && echo "is dir"

tools/osh2oil.py

@@ -739,7 +739,7 @@ def DoCommand(self, node, local_symbols, at_top_level=False):
      case_spid, in_spid, esac_spid = node.spids
      self.cursor.PrintUntil(case_spid)
      self.cursor.SkipUntil(case_spid + 1)
      self.f.write('matchstr')
      self.f.write('match')

      # Reformat "$1" to $1
      self.DoWordInCommand(node.to_match, local_symbols)
@@ -768,24 +768,20 @@ def DoCommand(self, node, local_symbols, at_top_level=False):
        for pat in arm.pat_list:
          pass

        # Skip this
        self.f.write('with ')
        # Remove the )
        self.cursor.PrintUntil(rparen_spid)
        self.cursor.SkipUntil(rparen_spid + 1)
        self.f.write(' {')  # surround it with { }

        for child in arm.action:
          self.DoCommand(child, local_symbols)

        if dsemi_spid != const.NO_INTEGER:
          # Remove ;;
          self.cursor.PrintUntil(dsemi_spid)
          self.cursor.SkipUntil(dsemi_spid + 1)
          # NOTE: indentation here will be off because ;; is likely indented
          # with body.
          self.f.write('}')
        elif last_spid != const.NO_INTEGER:
          self.cursor.PrintUntil(last_spid)
          # NOTE: Indentation is also off here.  Arbitrarily put 4 spaces.
          self.f.write('    }\n')
        else:
          raise AssertionError(
              "Expected with dsemi_spid or last_spid in case arm")