volumen/justfile

# volumen.

binary := "volumen"
package := "./cmd/volumen"

# What the test and bench recipes sweep. The coverage floor holds over the
# whole module, so this stays broad; narrow it to the logic packages only
# if a thin cmd/ ever drags the floor down.
packages := "./..."

# The memory fence for the test recipes: a cgroup ceiling with swap off, so a
# runaway run dies as a failed run and never eats the machine.
memlimit := "4G"

# Arguments the server recipes pass: the local config and content directory.
serve_args := "serve --config ./config.toml --content ./posts"
# The dev server binds to loopback on a fixed port.
dev_args := "serve --config ./config.toml --content ./posts --host 127.0.0.1 --port 9091"

bindir := env_var_or_default("BINDIR", env_var("HOME") / ".local" / "bin")

default:
    @just --list

# Compile. Zero errors, zero warnings; -trimpath and -buildvcs make the binary place-independent and version-stamped.
build:
    CGO_ENABLED=0 go build -trimpath -buildvcs=true -ldflags "-s -w" -o bin/{{binary}} {{package}}

# The test gate: the suite, no cache, the coverage floor, under the memory fence.
test:
    #!/usr/bin/env perl
    my @fence = (q{systemd-run}, q{--user}, q{--scope},
                 q{-p}, q{MemoryMax={{memlimit}}}, q{-p}, q{MemorySwapMax=0});
    system(@fence, q{go}, q{test}, q{-count=1}, q{-timeout}, q{10m},
      q{-coverprofile}, q{coverage.out}, qw({{packages}})) == 0
      or die qq{the test suite failed\n};
    open(my $c, q{-|}, q{go}, q{tool}, q{cover}, q{-func=coverage.out}) or die qq{cover: $!};
    my $total;
    while (my $l = <$c>) { $total = $1 if $l =~ m{^total:\s+\S+\s+([0-9.]+)%} }
    close($c);
    die qq{no total line in coverage.out\n} unless defined $total;
    printf qq{Total coverage: %s%%\n}, $total;
    exit($total < 80 ? 1 : 0);

# The same suite under the race detector. The expensive one, still fenced.
race:
    systemd-run --user --scope -p MemoryMax={{memlimit}} -p MemorySwapMax=0 go test -race -count=1 -timeout 10m {{packages}}

# Fast scoped run for iterating. This is the one that runs after every edit.
unit pkgs=packages run=".*":
    systemd-run --user --scope -p MemoryMax={{memlimit}} -p MemorySwapMax=0 go test {{pkgs}} -run '{{run}}'

# Time-boxed fuzz of one target in one package. The package is required; never a gate.
fuzz target pkg fuzztime="60s":
    systemd-run --user --scope -p MemoryMax={{memlimit}} -p MemorySwapMax=0 go test -run '^$' -fuzz '{{target}}' -fuzztime={{fuzztime}} {{pkg}}

# A ceiling would distort the measurement, so bench is the deliberate exception to the fence.

# Benchmarks. On an idle machine only, unfenced.
bench pkgs=packages:
    go test -run '^$' -bench=. -benchmem -count=5 {{pkgs}}

# Format in place.
fmt:
    gofmt -w .

# Zero diff. Prints nothing when everything is formatted.
fmt-check:
    #!/usr/bin/env perl
    open(my $g, q{-|}, q{gofmt}, q{-l}, q{.}) or die qq{gofmt: $!};
    my @bad = <$g>;
    close($g);
    print @bad;
    exit(@bad ? 1 : 0);

# Both static gates: go vet and go fix -diff.
vet:
    go vet ./...
    go fix -diff ./...

# The definition of done, in one command. Once per task, never per edit.
gates: build fmt-check vet test race

# Build artefacts only, not the installed binary.
clean:
    rm -rf bin/ coverage.out

# Build, then copy the binary into bindir.
install: build
    install -d "{{bindir}}"
    install -m 755 bin/{{binary}} "{{bindir}}/{{binary}}"

# Remove the installed binary.
uninstall:
    rm -f "{{bindir}}/{{binary}}"

# Run the program. The flag is there because `go run` does not stamp the build otherwise.
run:
    go run -buildvcs=true {{package}} {{serve_args}}

# Run the server bound to loopback on a fixed port, for developing against it.
dev:
    go run -buildvcs=true {{package}} {{dev_args}}