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muon(1) General Commands Manual muon(1) NAME muon - a meson-compatible build system SYNOPSIS muon [-vh] [-C <chdir>] <command> [<args>] muon setup [-D[subproject:]option=value...] build cd build <invoke backend build tool> muon test [options] muon install [options] DESCRIPTION muon interprets source files written in the meson dsl and produces buildfiles for a backend. When building meson projects with muon, you typically first start by running the setup command in the project root. This will create build- files for the backend in the build dir you specify. You then invoke the backend, e.g. ninja -C <build dir> If the project defines tests, you may run them with the test subcom- mand, and finally install the project with the install subcommand. OPTIONS • -v - enable verbose output • -q - silence logging except for errors • -C <path> - chdir to path before executing a command • -h - print a help message COMMANDS muon requires a command. All commands accept a -h option which prints a brief summary of their usage. analyze muon analyze [-l] [-m <mode>] [-q] [-O <path>] [-W [no-]<diagnos- tic|list|error>] [command] Run a static analyzer on the current project. OPTIONS: • -l - optimize output for editor linter plugins. For example, a diagnostic is added for the subdir() callsite, so that the edi- tor can highlight subdirs with errors in them. • -m <mode> - set the language mode • -q - only report errors • -O <path> - read project file with matching path from stdin. This is useful for editor linter plugins that run as you type on files that aren't saved to disk. • -W [no-]<diagnostic> - enable or disable a particular diagnos- tic, e.g. unused-variable. • -W list - list available diagnostics. • -W error - turn all warnings into errors. COMMANDS: • trace - print a tree of all meson source files that are evalu- ated • lsp - run the analyzer as a language server • root-for <path> - given the path to a file, try to determine the project's root • file <path> - run the analyzer in single file mode. Implies -m module, but -m script can be passed to analyze a file in script mode. This is useful for catching bugs in scripts that will be evaluated with muon internal eval, or script modules. fmt muon fmt [-i] [-q] [-l] [-c <muon_fmt.ini>] <file>[ <file>[...]] Format a source file. OPTIONS: • -q - exit with 1 if files would be modified by muon fmt • -l - like -q but also print failing filenames • -i - format files in-place • -c <muon_fmt.ini> - read configuration from muon_fmt.ini • -e - try to read configuration from .editorconfig. Only inden- tation related settings are recognized. CONFIGURATION OPTIONS +-------------------+------------+---------+------------------+ | key | type | default | description | +-------------------+------------+---------+------------------+ | max_line_len | int | 80 | The maximum | | | | | length of lines | | | | | before they are | | | | | split | +-------------------+------------+---------+------------------+ | indent_style | space|tab | space | Wether to use | | | | | spaces or tabs | | | | | for indentation | +-------------------+------------+---------+------------------+ | indent_size | int | 4 | For indent_style | | | | | = space, the | | | | | number of spaces | | | | | to indent by per | | | | | level | +-------------------+------------+---------+------------------+ | insert_fi- | bool | true | Whether or not | | nal_newline | | | to insert a | | | | | trailing newline | | | | | at the end of | | | | | the file | +-------------------+------------+---------+------------------+ | end_of_line | lf|crlf|cr | <unset> | The type of line | | | | | ending to use. | | | | | If this value is | | | | | not set then the | | | | | line ending of | | | | | the first line | | | | | in the source | | | | | file will be | | | | | used. | +-------------------+------------+---------+------------------+ | space_array | bool | false | Whether to in- | | | | | clude spaces | | | | | around array el- | | | | | ements (ex. [1] | | | | | vs [ 1 ]) | +-------------------+------------+---------+------------------+ | kwargs_force_mul- | bool | false | Make every dic- | | tiline | | | tionary literal | | | | | and function | | | | | call with kwargs | | | | | expand into mul- | | | | | tiple lines. | +-------------------+------------+---------+------------------+ | wide_colon | bool | false | Whether to put a | | | | | space before the | | | | | colon operator | | | | | (ex. `key : | | | | | val`) | +-------------------+------------+---------+------------------+ | no_sin- | bool | false | Don't add a | | gle_comma_func- | | | trailing comma | | tion | | | to multi-line | | | | | function calls | | | | | with only one | | | | | argument. | +-------------------+------------+---------+------------------+ | sort_files | bool | true | Whether to sort | | | | | the arguments of | | | | | files() | +-------------------+------------+---------+------------------+ | group_arg_value | bool | true | Whether to group | | | | | strings in array | | | | | literals such | | | | | that command | | | | | line arguments | | | | | that take a | | | | | value remain on | | | | | the same line as | | | | | the value. The | | | | | heuristic used | | | | | is that if a | | | | | string starts | | | | | with `-` and the | | | | | next string does | | | | | not, put both | | | | | strings on the | | | | | same line | +-------------------+------------+---------+------------------+ | sim- | bool | false | Whether to auto- | | plify_string_lit- | | | matically con- | | erals | | | vert multiline | | | | | string literals | | | | | without new- | | | | | lines, as well | | | | | as f-strings | | | | | without format- | | | | | ting into sin- | | | | | gle-quoted | | | | | string literals. | +-------------------+------------+---------+------------------+ | indent_be- | str | ' ' | The indent to | | fore_comments | | | put before | | | | | trailing com- | | | | | ments | +-------------------+------------+---------+------------------+ | sticky_parens | bool | false | Controls whether | | | | | parenthesis used | | | | | for grouping are | | | | | stuck to what | | | | | they enclose or | | | | | are exploded out | | | | | to be on their | | | | | own lines. | +-------------------+------------+---------+------------------+ | continuation_in- | bool | false | Controls whether | | dent | | | a multiline con- | | | | | ditional in an | | | | | if statement | | | | | gets an extra | | | | | indent. | +-------------------+------------+---------+------------------+ install muon install [-n] Installs the project. The DESTDIR environment variable is respected and will prefix all installation directories if it is present. OPTIONS: • -n - dry run • -d <destdir> - set destdir internal muon internal <command> [<args>] Internal contains several subcommands used by muon internally. These commands are subject to change at any time and should not be relied upon. Not all internal commands are documented. COMMANDS: • eval - evaluate a source file • exe - execute a command • repl - start a meson dsl repl • dump_funcs - output all supported functions and arguments internal check muon internal check [-p|-d] [-m <mode>] <filename> Check if filename parses. OPTIONS: • -p - print the parsed ast • -d - print the dissasembly • -m <mode> - set the compilation mode • -f - parse in formatting mode internal eval muon internal eval [-e] [-s] -c <command> | <filename> [<args>] Evaluate a source file. The interpreter environment is substan- tially different from the typical environment during setup. Build related functions are unavailable, as well as many other functions including subdir. Additionally, the variable argv is defined as an array containing the commandline starting at <filename>. OPTIONS: • -e - lookup <filename> as an embedded script • -s - disable functions that are unsafe to be called at random, particularly `run_command()`. The motivation for this flag is so that automated fuzz testing can be used without accidentally executing something like `run_command('rm', '-rf', '/')`. • -c <command> - evaluate the string command rather than reading from a file internal exe muon internal exe [-f <input file>] [-c <output file>] [-e <env.dat>] [-a <args.dat>] [-R <file>] [-- <cmd> [<args>]] Execute <cmd> with arguments <args>. OPTIONS: • -f <input file> - pass input file as stdin to <cmd> • -c <output file> - capture stdout of <cmd> and write it to out- put file • -e <env.dat> - read and set environment variables from env.dat • -a <args.dat> - read and set command from args.dat • -R <file> - remove file if it exists before executing the com- mand internal repl muon internal repl Start a meson dsl repl. The functions available are limited as with internal eval. internal summary muon internal summary Print a previously configured project's summary. internal dump_funcs muon internal dump_funcs Print all supported functions, methods, and module functions with their arguments, argument types, and return types to stdout. This subcommand is mainly useful for generating https://muon.build/sta- tus.html. meson [muon] meson ... A compatibility layer that attempts to translate all flags and operands from meson cli syntax to muon cli syntax. For example, the following two commands: muon meson setup build --werror --prefix=/ muon meson test -C build --list Would be translated into the following two muon versions respec- tively: muon setup -Dwerror=true -Dprefix=/ build muon -C build test -l This compatibility layer is also enabled when muon's executable is named meson. For a more detailed usage information you can use the following two commands: muon meson -h muon meson <subcommand> -h NOTE: This is a best-effort translation and does not guarantee or imply full cli compatibility. Many unimplemented flags are ignored and attempting to use an unsupported subcommands will result in an error. options muon options [-a] [-m] Lists available project options and defaults. This command may ei- ther be run from the project root or from a build directory. Run- ning this command from a build directory highlights configured op- tion values in the output, whereas running it from the project root causes the default value for each option to be highlighted. OPTIONS: • -a - Include builtin global and per-project options in the out- put. • -m - Only display option values that have been modified. samu muon samu [<args>] Executes an embedded copy of samu(1). This command requires that muon was compiled with samu enabled. setup muon setup [-D[subproject:]option=value...] [-#] <build dir> Interpret all source files and generate buildfiles in build dir. OPTIONS: • -D [subproject:]option=value - Set build options. Options are either built in or project-defined. Subproject options can be specified by prepending the subproject's name and a colon to the option. This option may be specified multiple times. • -# Display a progress bar during setup. Can be combined with muon -q to only display a progress bar. subprojects muon subprojects Run various commands over all subprojects. Only subprojects with .wrap files are supported. Most commands accept a list of projects as trailing arguments. OPTIONS: • -d <directory> - manually specify subprojects directory. By default muon will evaluate the current project's project() call to determine the value for subproject_dir. COMMANDS: • check-wrap - check if a wrap file is valid • update - update subprojects with .wrap files • list - list subprojects with .wrap files and their status • clean - clean wrap-git subprojects test muon test [-a] [-b] [-d <display mode>] [-o <output>] [-e <setup>] [-f] [-j <jobs>] [-l] [-R] [-s <suite>] [-S] [-v [-v]] [<test> [<test>[...]] Execute tests defined in source files. The default is to execute all tests, but you can also specify which tests to execute on the command line. <test> should consist of an optional project name, followed by a colon and then a test name. Either may be omitted. For example, "test name" and ":test name" will match all tests named 'test name' in any project. "proj:test name" will match all tests named 'test name' in the project 'proj'. "proj:" will match all tests in the project 'proj'. Additionally, the test name may be a glob expression. For example, "proj:long*" will match all tests with names starting with 'long' in the project 'proj'. OPTIONS: • -a - include all tests from all projects • -b - run benchmarks instead of tests • -d <display mode> - Control test progress output. display mode can be one of auto, dots, or bar. dots prints a '.' for suc- cess and 'E' for error, bar prints a progress bar with an error count. The default mode, auto, selects bar if the output de- vice is a terminal or dots otherwise. • -o <output mode> - Control test results output. term prints failures and output to the terminal, html generates a single- page html report, and json outputs test information to a json file. • -e <setup> - Use test setup setup. • -f - Fail fast. exit after first test failure is encountered. • -j - Set the number of jobs used when running tests. • -l - List tests that would be run with the current setup, suites, etc. The format of the output is <project name>:<list of suites> - <test_name>. • -R - No rebuild. Disable automatic build system invocation prior to running tests. • -s <suite> - Only run tests in suite suite. This option may be specified multiple times. • -S - print a summary of test results, including the duration of each test • -v - Increase verbosity. When passed once, print test results as they are completed. When passed twice, the stdout/stderr of tests is not captured. version muon version Print out version information as well as enabled features. EXTENSIONS muon provides some extra functions that may be called within source files. They are documented below. • dbg() - Begin an interactive debugger. • p(value) - Print any value's internal representation. For example, `p('hello')` prints `'hello'`. SEE ALSO meson.build(5) meson-reference(3) meson(1) AUTHORS Maintained by Stone Tickle <lattis@mochiro.moe>, who is assisted by other open source contributors. For more information about muon devel- opment, see <https://sr.ht/~lattis/muon>. 2025-07-28 muon(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | COMMANDS | EXTENSIONS | SEE ALSO | AUTHORS
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