name: "Tilde expansion"
cases:
  - name: "Tilde expansion: basic"
    home_dir: .
    stdin: |
      test_root=$(realpath $(pwd))

      mkdir subdir
      cd subdir

      D=~
      D=$(realpath $D)
      echo "~: ${D//${test_root}/TEST_ROOT}"

  - name: "Tilde expansion: explicit user"
    home_dir: .
    stdin: |
      test_root=$(pwd)

      D=~root
      echo "~root: $D"

      D=~nonexistentuserwhodoesnotexist
      echo "~<non-existent-username>: $D"

  - name: "Tilde expansion: working dirs"
    home_dir: .
    stdin: |
      test_root=$(pwd)

      mkdir subdir
      cd subdir

      D=~+
      echo "~+: ${D//${test_root}/TEST_ROOT}"

      D=~-
      echo "~-: ${D//${test_root}/TEST_ROOT}"

      unset OLDPWD
      D=~-
      echo "~- (without OLDPWD): ${D//${test_root}/TEST_ROOT}"

  - name: "Tilde expansion: dir stack"
    stdin: |
      test_root=$(pwd)

      for name in a b c d e f g; do
        mkdir $name
        pushd $name >/dev/null 2>&1
      done

      D=~2
      echo "~2: ${D//${test_root}/TEST_ROOT}"

      D=~9
      echo "~9: ${D//${test_root}/TEST_ROOT}"

      D=~+2
      echo "~+2: ${D//${test_root}/TEST_ROOT}"

      D=~+9
      echo "~+9: ${D//${test_root}/TEST_ROOT}"

      D=~-2
      echo "~-2: ${D//${test_root}/TEST_ROOT}"

      D=~-9
      echo "~-9: ${D//${test_root}/TEST_ROOT}"

  - name: "Tilde expansion: after colons"
    home_dir: .
    stdin: |
      test_root=~

      D=something:~
      echo "D: ${D//${test_root}/TEST_ROOT}"

      D=something":"~
      echo "D: ${D//${test_root}/TEST_ROOT}"

      D=something:"~"
      echo "D: ${D//${test_root}/TEST_ROOT}"

      D=something:~:another:~
      echo "D: ${D//${test_root}/TEST_ROOT}"

  - name: "Tilde expansion: unexpanded tildes"
    home_dir: .
    stdin: |
      test_root=$(pwd)

      D="~"
      echo "D: ${D//${test_root}/TEST_ROOT}"

      D=x~
      echo "D: ${D//${test_root}/TEST_ROOT}"

  - name: "Tilde expansion: colon context sensitivity"
    env:
      HOME: /testhome
    stdin: |
      # Tilde at word start always expands (in both contexts)
      echo "echo tilde: $(echo ~)"
      var=~
      echo "assignment tilde: ${var}"

      # Tilde after colon: should NOT expand in non-assignment context
      echo "echo with colon: $(echo ~:~/bin)"
      echo ~:~/bin

      # But SHOULD expand in assignment context
      var=~:~/bin
      echo "assignment with colon: ${var}"

      # Complex PATH-like example
      PATH=/usr/bin:~:/bin:~/local
      echo "PATH: ${PATH}"

  - name: "Tilde expansion: parameter defaults"
    env:
      HOME: /testhome
    stdin: |
      echo "Use default value with tilde"
      unset myvar
      echo "Default: ${myvar:-~}"
      echo "myvar after :-: ${myvar}"

      echo "Assign default value with tilde"
      unset myvar
      echo "Assign default: ${myvar:=~}"
      echo "myvar after :=: ${myvar}"

      echo "Use default with colon-tilde"
      unset myvar2
      echo "Default colon-tilde: ${myvar2:-~:~/bin}"

      echo "Assign default with colon-tilde"
      unset myvar3
      echo "Assign colon-tilde: ${myvar3:=~:~/bin}"
      echo "myvar3 after := ${myvar3}"