mirror of
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Niels Lohmann
d7af0f7d3b
tools/amalgamate/README.md is the unmodified upstream text and no longer matches how the tool is used here: - It named a Bitbucket origin that no longer exists; CHANGES.md already tracks the GitHub mirror commit this copy is based on. - It asked for Python 2.7, but CI and the Makefile run the script with python3. - It told readers to run ./test.sh (not vendored) and install to /usr/local/bin; in this repository the tool runs through `make amalgamate`. - Its usage synopsis showed `-v` taking no argument, but the script's own argparser requires `choices=["yes", "no"]`, so that form fails with "argument -v/--verbose: expected one argument". The Makefile calls it as `--verbose=yes`. - It pointed at test/source.c.json and test/include.h.json, which are not vendored; the configs actually used are config_json.json and config_json_fwd.json. Rewrote only the Installing and Using sections to match; left the "Here be dragons" caveats and the rest of the vendored code untouched to avoid diverging further from upstream. Overlaps #5615, which edits amalgamate.py, this README and CHANGES.md. #5717 item 6 Signed-off-by: Niels Lohmann <mail@nlohmann.me>
70 lines
2.7 KiB
Markdown
70 lines
2.7 KiB
Markdown
# amalgamate.py - Amalgamate C source and header files
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Origin: https://github.com/edlund/amalgamate (formerly hosted at
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https://bitbucket.org/erikedlund/amalgamate, which no longer exists; see
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`CHANGES.md` for the upstream commit this copy is based on)
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`amalgamate.py` aims to make it easy to use SQLite-style C source and header
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amalgamation in projects.
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For more information, please refer to: http://sqlite.org/amalgamation.html
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## Here be dragons
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`amalgamate.py` is quite dumb, it only knows the bare minimum about C code
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required in order to be able to handle trivial include directives. It can
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produce weird results for unexpected code.
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Things to be aware of:
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`amalgamate.py` will not handle complex include directives correctly:
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#define HEADER_PATH "path/to/header.h"
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#include HEADER_PATH
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In the above example, `path/to/header.h` will not be included in the
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amalgamation (HEADER_PATH is never expanded).
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`amalgamate.py` makes the assumption that each source and header file which
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is not empty will end in a new-line character, which is not immediately
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preceded by a backslash character (see 5.1.1.2p1.2 of ISO C99).
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`amalgamate.py` should be usable with C++ code, but raw string literals from
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C++11 will definitely cause problems:
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R"delimiter(Terrible raw \ data " #include <sneaky.hpp>)delimiter"
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R"delimiter(Terrible raw \ data " escaping)delimiter"
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In the examples above, `amalgamate.py` will stop parsing the raw string literal
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when it encounters the first quotation mark, which will produce unexpected
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results.
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## Installing amalgamate.py
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Python 3 is required.
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In this repository, `amalgamate.py` is not installed separately; it is run in
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place through `make amalgamate`, which calls it once for `json.hpp` and once
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for `json_fwd.hpp` (see the root `Makefile`).
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## Using amalgamate.py
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amalgamate.py -c path/to/config.json -s path/to/source/dir \
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[-p path/to/prologue.(c|h)] [--verbose=yes|no]
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* The `-c, --config` option should specify the path to a JSON config file which
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lists the source files, include paths and where to write the resulting
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amalgamation. `config_json.json` and `config_json_fwd.json` in this
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directory are the configs used for `json.hpp` and `json_fwd.hpp`; each
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sets `target`, `sources` and `include_paths`.
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* The `-s, --source` option should specify the path to the source directory.
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This is useful for supporting separate source and build directories.
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* The `-p, --prologue` option should specify the path to a file which will be
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added to the beginning of the amalgamation. It is optional.
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* The `-v, --verbose` option takes `yes` or `no` (for example
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`--verbose=yes`, as used by the Makefile). It is optional.
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