137 lines
4.4 KiB
Perl
137 lines
4.4 KiB
Perl
$ cat > dune-project << EOF
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> (lang dune 3.0)
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> EOF
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$ cat > dune << EOF
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> (rule
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> (alias runtest)
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> (action
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> (diff a b)))
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>
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> (rule (write-file b b))
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> EOF
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$ cat > a << EOF
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> a
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> EOF
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--diff-command accepts a command name that is passed both files.
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$ dune runtest --diff-command echo
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a b
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File "a", line 1, characters 0-0:
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Error: command reported no differences: cd _build/default && echo a b
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[1]
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If the command succeeds (reports no diff), this is displayed.
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$ dune runtest --diff-command true
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File "a", line 1, characters 0-0:
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Error: command reported no differences: cd _build/default && true a b
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[1]
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If the command fails, this is displayed too.
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$ dune runtest --diff-command false
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File "a", line 1, characters 0-0:
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Command exited with code 1.
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[1]
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As a special case, - can be passed and just the fact that they differ is
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printed.
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$ dune runtest --diff-command -
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File "a", line 1, characters 0-0:
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Error: Files _build/default/a and _build/default/b differ.
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[1]
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The default behavior (when --diff-command is not passed) is equivalent to
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`--diff-cmd` when testing dune.
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$ dune runtest
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File "a", line 1, characters 0-0:
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Error: Files _build/default/a and _build/default/b differ.
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[1]
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Outside of dune, it is to first look for patdiff in PATH.
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To simulate what happens inside of dune, we'll need to setup a _path directory
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with just the required binaries. _tools contains succeed (that prints its
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arguments and succeeds) and fail (that prints its arguments and fails). In
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addition to unsetting INSIDE_DUNE, we also need to pass
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--always-show-command-line in order to have the same results locally and in CI.
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$ mkdir _tools
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$ cat > _tools/succeed << 'EOF'
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> #!/bin/sh
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> echo Running "$0" "$@"
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> EOF
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$ chmod +x _tools/succeed
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$ cat > _tools/fail << 'EOF'
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> #!/bin/sh
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> echo Running "$0" "$@"
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> false
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> EOF
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$ chmod +x _tools/fail
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$ mkdir _path
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$ ln -s $(command -v dune) _path/
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$ ln -s $(command -v ocamlc) _path/
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$ cp _tools/fail _path/patdiff
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$ cp _tools/fail _path/diff
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$ cp _tools/fail _path/git
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$ (unset INSIDE_DUNE; PATH=_path dune runtest --always-show-command-line --root .)
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File "a", line 1, characters 0-0:
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(cd _build/default && $TESTCASE_ROOT/_path/patdiff -keep-whitespace -location-style omake -ascii a b)
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Running $TESTCASE_ROOT/_path/patdiff -keep-whitespace -location-style omake -ascii a b
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[1]
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Otherwise, it will use git diff.
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$ rm _path/patdiff
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$ (unset INSIDE_DUNE; PATH=_path dune runtest --always-show-command-line --root .)
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File "a", line 1, characters 0-0:
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$TESTCASE_ROOT/_path/git --no-pager diff --no-index --color=always -u _build/default/a _build/default/b
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Running $TESTCASE_ROOT/_path/git --no-pager diff --no-index --color=always -u _build/default/a _build/default/b
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[1]
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This also happens if patdiff returns no difference.
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$ cp _tools/succeed _path/patdiff
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$ (unset INSIDE_DUNE; PATH=_path dune runtest --always-show-command-line --root .)
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(cd _build/default && $TESTCASE_ROOT/_path/patdiff -keep-whitespace -location-style omake -ascii a b)
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Running $TESTCASE_ROOT/_path/patdiff -keep-whitespace -location-style omake -ascii a b
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File "a", line 1, characters 0-0:
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$TESTCASE_ROOT/_path/git --no-pager diff --no-index --color=always -u _build/default/a _build/default/b
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Running $TESTCASE_ROOT/_path/git --no-pager diff --no-index --color=always -u _build/default/a _build/default/b
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[1]
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If patdiff or git are unavailable, it uses diff.
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$ rm _path/patdiff
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$ rm _path/git
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$ (unset INSIDE_DUNE; PATH=_path dune runtest --always-show-command-line --root .)
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File "a", line 1, characters 0-0:
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(cd _build/default && $TESTCASE_ROOT/_path/diff -u a b)
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Running $TESTCASE_ROOT/_path/diff -u a b
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[1]
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In this situation (when an automatically discovered command is used), if the
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command succeeds, the "difference" message is still printed.
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$ cp _tools/succeed _path/diff
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$ (unset INSIDE_DUNE; PATH=_path dune runtest --always-show-command-line --root .)
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(cd _build/default && $TESTCASE_ROOT/_path/diff -u a b)
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Running $TESTCASE_ROOT/_path/diff -u a b
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File "a", line 1, characters 0-0:
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Error: Files _build/default/a and _build/default/b differ.
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[1]
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If diff is also not available, it just reports a difference.
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$ rm _path/diff
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$ (unset INSIDE_DUNE; PATH=_path dune runtest --always-show-command-line --root .)
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File "a", line 1, characters 0-0:
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Error: Files _build/default/a and _build/default/b differ.
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[1]
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