Move internal/log from apex/log to log/slog (closes #77)

internal/log now logs through log/slog. After Init, records go to a small slog.Handler that prints the same lines as before, colored by the same rule; before Init they go to slog.Default(). Level filtering, the helpers and their call sites are unchanged. With NO_COLOR set on a terminal, log lines are no longer colored. pterm is dropped: mfer used it only to print progress lines to the configured stdout, which fmt now does directly, outside slog. apex/log, pterm and their indirect dependencies leave go.mod; golang.org/x/term, already in the module graph, becomes direct. simplelog is not imported: importing it replaces slog's default handler, in every program that imports package mfer, with one that writes to stdout. The logger stays process-global, since injecting it would change package mfer's API. Model: opus-5-5
2026-10-04 13:05:36 +00:00
parent 4bf87d1ccf
commit 3eba887717
4 changed files with 371 additions and 147 deletions
@@ -3,42 +3,33 @@ module sneak.berlin/go/mfer
 go 1.23

 require (
-	github.com/apex/log v1.9.0
 	github.com/davecgh/go-spew v1.1.1
 	github.com/dustin/go-humanize v1.0.1
 	github.com/google/uuid v1.1.2
 	github.com/klauspost/compress v1.18.2
 	github.com/multiformats/go-multihash v0.2.3
-	github.com/pterm/pterm v0.12.35
 	github.com/spf13/afero v1.8.0
 	github.com/stretchr/testify v1.8.1
 	github.com/urfave/cli/v2 v2.27.7
+	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211
 	google.golang.org/protobuf v1.28.1
 )

 require (
-	github.com/atomicgo/cursor v0.0.1 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.7 // indirect
-	github.com/fatih/color v1.7.0 // indirect
-	github.com/gookit/color v1.4.2 // indirect
 	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
-	github.com/mattn/go-colorable v0.1.2 // indirect
-	github.com/mattn/go-isatty v0.0.8 // indirect
-	github.com/mattn/go-runewidth v0.0.13 // indirect
+	github.com/kr/pretty v0.2.0 // indirect
 	github.com/minio/sha256-simd v1.0.0 // indirect
 	github.com/mr-tron/base58 v1.2.0 // indirect
 	github.com/multiformats/go-varint v0.0.6 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/rivo/uniseg v0.2.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
-	github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
 	github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 // indirect
 	golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e // indirect
 	golang.org/x/sys v0.1.0 // indirect
-	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
 	golang.org/x/text v0.3.6 // indirect
+	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	lukechampine.com/blake3 v1.1.6 // indirect
 )
@@ -38,21 +38,6 @@ cloud.google.com/go/storage v1.14.0/go.mod h1:GrKmX003DSIwi9o29oFT7YDnHYwZoctc3f
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/MarvinJWendt/testza v0.1.0/go.mod h1:7AxNvlfeHP7Z/hDQ5JtE3OKYT3XFUeLCDE2DQninSqs=
-github.com/MarvinJWendt/testza v0.2.1/go.mod h1:God7bhG8n6uQxwdScay+gjm9/LnO4D3kkcZX4hv9Rp8=
-github.com/MarvinJWendt/testza v0.2.8/go.mod h1:nwIcjmr0Zz+Rcwfh3/4UhBp7ePKVhuBExvZqnKYWlII=
-github.com/MarvinJWendt/testza v0.2.10/go.mod h1:pd+VWsoGUiFtq+hRKSU1Bktnn+DMCSrDrXDpX2bG66k=
-github.com/MarvinJWendt/testza v0.2.12 h1:/PRp/BF+27t2ZxynTiqj0nyND5PbOtfJS0SuTuxmgeg=
-github.com/MarvinJWendt/testza v0.2.12/go.mod h1:JOIegYyV7rX+7VZ9r77L/eH6CfJHHzXjB69adAhzZkI=
-github.com/apex/log v1.9.0 h1:FHtw/xuaM8AgmvDDTI9fiwoAL25Sq2cxojnZICUU8l0=
-github.com/apex/log v1.9.0/go.mod h1:m82fZlWIuiWzWP04XCTXmnX0xRkYYbCdYn8jbJeLBEA=
-github.com/apex/logs v1.0.0/go.mod h1:XzxuLZ5myVHDy9SAmYpamKKRNApGj54PfYLcFrXqDwo=
-github.com/aphistic/golf v0.0.0-20180712155816-02c07f170c5a/go.mod h1:3NqKYiepwy8kCu4PNA+aP7WUV72eXWJeP9/r3/K9aLE=
-github.com/aphistic/sweet v0.2.0/go.mod h1:fWDlIh/isSE9n6EPsRmC0det+whmX6dJid3stzu0Xys=
-github.com/atomicgo/cursor v0.0.1 h1:xdogsqa6YYlLfM+GyClC/Lchf7aiMerFiZQn7soTOoU=
-github.com/atomicgo/cursor v0.0.1/go.mod h1:cBON2QmmrysudxNBFthvMtN32r3jxVRIvzkUiF/RuIk=
-github.com/aws/aws-sdk-go v1.20.6/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
-github.com/aybabtme/rgbterm v0.0.0-20170906152045-cc83f3b3ce59/go.mod h1:q/89r3U2H7sSsE2t6Kca0lfwTK8JdoNGS/yzM/4iH5I=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
@@ -74,13 +59,9 @@ github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1m
 github.com/envoyproxy/go-control-plane v0.9.7/go.mod h1:cwu0lG7PUMfa9snN8LXBig5ynNVH9qI8YYLbd1fK2po=
 github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
-github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
-github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
-github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
@@ -134,21 +115,15 @@ github.com/google/pprof v0.0.0-20201023163331-3e6fc7fc9c4c/go.mod h1:kpwsk12EmLe
 github.com/google/pprof v0.0.0-20201203190320-1bf35d6f28c2/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20201218002935-b9804c9f04c2/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.1.2 h1:EVhdT+1Kseyi1/pUmXKaFxYsDNy9RQYkMWRH68J/W7Y=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/googleapis/google-cloud-go-testing v0.0.0-20200911160855-bcd43fbb19e8/go.mod h1:dvDLG8qkwmyD9a/MJJN3XJcT3xFxOKAvTZGvuZmac9g=
-github.com/gookit/color v1.4.2 h1:tXy44JFSFkKnELV6WaMo/lLfu/meqITX3iAV52do7lk=
-github.com/gookit/color v1.4.2/go.mod h1:fqRyamkC1W8uxl+lxCQxOT09l/vYfZ+QeiX3rKQHCoQ=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
-github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
-github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
-github.com/jpillora/backoff v0.0.0-20180909062703-3050d21c67d7/go.mod h1:2iMrUgbbvHEiQClaW2NsSzMyGHqN+rDFqY705q49KG0=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
 github.com/jstemmer/go-junit-report v0.9.1/go.mod h1:Brl9GWCQeLvo8nXZwPNNblvFj/XSXhF0NWZEnDohbsk=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
@@ -158,22 +133,12 @@ github.com/klauspost/cpuid/v2 v2.0.4/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa02
 github.com/klauspost/cpuid/v2 v2.0.9 h1:lgaqFMSdTdQYdZ04uHyN2d/eKdOMyi2YLSvlQIBFYa4=
 github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
-github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.2.0 h1:s5hAObm+yFO5uHYt5dYjxi2rXrsnmRpJx4OYvIWUaQs=
 github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/mattn/go-colorable v0.1.1/go.mod h1:FuOcm+DKB9mbwrcAfNl7/TZVBZ6rcnceauSikq3lYCQ=
-github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU=
-github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
-github.com/mattn/go-isatty v0.0.5/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
-github.com/mattn/go-isatty v0.0.8 h1:HLtExJ+uU2HOZ+wI0Tt5DtUDrx8yhUqDcp7fYERX4CE=
-github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
-github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
-github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
-github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
 github.com/minio/sha256-simd v1.0.0 h1:v1ta+49hkWZyvaKwrQB8elexRqm6Y0aMLjCNsrYxo6g=
 github.com/minio/sha256-simd v1.0.0/go.mod h1:OuYzVNI5vcoYIAmbIvHPl3N3jUzVedXbKy5RFepssQM=
 github.com/mr-tron/base58 v1.2.0 h1:T/HDJBh4ZCPbU39/+c3rRvE0uKBQlU27+QI8LJ4t64o=
@@ -182,32 +147,14 @@ github.com/multiformats/go-multihash v0.2.3 h1:7Lyc8XfX/IY2jWb/gI7JP+o7JEq9hOa7B
 github.com/multiformats/go-multihash v0.2.3/go.mod h1:dXgKXCXjBzdscBLk9JkjINiEsCKRVch90MdaGiKsvSM=
 github.com/multiformats/go-varint v0.0.6 h1:gk85QWKxh3TazbLxED/NlDVv8+q+ReFJk7Y2W/KhfNY=
 github.com/multiformats/go-varint v0.0.6/go.mod h1:3Ls8CIEsrijN6+B7PbrXRPxHRPuXSrVKRY101jdMZYE=
-github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/gomega v1.5.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
-github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/sftp v1.13.1/go.mod h1:3HaPG6Dq1ILlpPZRO0HVMrsydcdLt6HRDccSgb87qRg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
-github.com/pterm/pterm v0.12.27/go.mod h1:PhQ89w4i95rhgE+xedAoqous6K9X+r6aSOI2eFF7DZI=
-github.com/pterm/pterm v0.12.29/go.mod h1:WI3qxgvoQFFGKGjGnJR849gU0TsEOvKn5Q8LlY1U7lg=
-github.com/pterm/pterm v0.12.30/go.mod h1:MOqLIyMOgmTDz9yorcYbcw+HsgoZo3BQfg2wtl3HEFE=
-github.com/pterm/pterm v0.12.31/go.mod h1:32ZAWZVXD7ZfG0s8qqHXePte42kdz8ECtRyEejaWgXU=
-github.com/pterm/pterm v0.12.33/go.mod h1:x+h2uL+n7CP/rel9+bImHD5lF3nM9vJj80k9ybiiTTE=
-github.com/pterm/pterm v0.12.35 h1:A/vHwDM+WByn0sTPlpL2L6kOTy12xqZuwNFMF/NlA+U=
-github.com/pterm/pterm v0.12.35/go.mod h1:NjiL09hFhT/vWjQHSj1athJpx6H8cjpHXNAK5bUw8T8=
-github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
-github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
-github.com/rogpeppe/fastuuid v1.1.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
-github.com/smartystreets/assertions v1.0.0/go.mod h1:kHHU4qYBaI3q23Pp3VPrmWhuIUrLW/7eUrw0BU5VaoM=
-github.com/smartystreets/go-aws-auth v0.0.0-20180515143844-0c1422d1fdb9/go.mod h1:SnhjPscd9TpLiy1LpzGSKh3bXCfxxXuqd9xmQJy3slM=
-github.com/smartystreets/gunit v1.0.0/go.mod h1:qwPWnhz6pn0NnRBP++URONOVyNkPyr4SauJk4cUOwJs=
 github.com/spaolacci/murmur3 v1.1.0 h1:7c1g84S4BPRrfL5Xrdp6fOJ206sU9y293DDHaoy0bLI=
 github.com/spaolacci/murmur3 v1.1.0/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/spf13/afero v1.8.0 h1:5MmtuhAgYeU6qpa7w7bP0dv6MBYuup0vekhSpSkoq60=
@@ -215,26 +162,15 @@ github.com/spf13/afero v1.8.0/go.mod h1:CtAatgMJh6bJEIs48Ay/FOnkljP3WeGUG0MC1RfA
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-github.com/tj/assert v0.0.0-20171129193455-018094318fb0/go.mod h1:mZ9/Rh9oLWpLLDRpvE+3b7gP/C2YyLFYxNmcLnPTMe0=
-github.com/tj/assert v0.0.3 h1:Df/BlaZ20mq6kuai7f5z2TvPFiwC3xaWJSDQNiIS3Rk=
-github.com/tj/assert v0.0.3/go.mod h1:Ne6X72Q+TB1AteidzQncjw9PabbMp4PBMZ1k+vd1Pvk=
-github.com/tj/go-buffer v1.1.0/go.mod h1:iyiJpfFcR2B9sXu7KvjbT9fpM4mOelRSDTbntVj52Uc=
-github.com/tj/go-elastic v0.0.0-20171221160941-36157cbbebc2/go.mod h1:WjeM0Oo1eNAjXGDx2yma7uG2XoyRZTq1uv3M/o7imD0=
-github.com/tj/go-kinesis v0.0.0-20171128231115-08b17f58cb1b/go.mod h1:/yhzCV0xPfx6jb1bBgRFjl5lytqVqZXEaeqWP8lTEao=
-github.com/tj/go-spin v1.1.0/go.mod h1:Mg1mzmePZm4dva8Qz60H2lHwmJ2loum4VIrLgVnKwh4=
 github.com/urfave/cli/v2 v2.27.7 h1:bH59vdhbjLv3LAvIu6gd0usJHgoTTPhCFib8qqOwXYU=
 github.com/urfave/cli/v2 v2.27.7/go.mod h1:CyNAG/xg+iAOg0N4MPGZqVmv2rCoP267496AOXUZjA4=
-github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 h1:QldyIu/L63oPpyvQmHgvgickp1Yw510KJOqX7H24mg8=
-github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
 github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 h1:gEOO8jv9F4OT7lGCjxCBTO/36wtF6j2nSip77qHd4x4=
 github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1/go.mod h1:Ohn+xnUBiLI6FVj/9LpzZWtj1/D6lUovWYBkxHVV3aM=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
@@ -248,7 +184,6 @@ go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
@@ -292,7 +227,6 @@ golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
@@ -342,9 +276,7 @@ golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -375,15 +307,11 @@ golang.org/x/sys v0.0.0-20201201145000-ef89a241ccb3/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210104204734-6f8348627aad/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210225134936-a50acf3fe073/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211013075003-97ac67df715c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -545,13 +473,8 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -1,19 +1,25 @@
-// Package log provides leveled logging with progress output helpers
-// on top of apex/log and pterm.
+// Package log provides leveled logging on top of log/slog, and helpers that
+// print progress lines which overwrite each other in place on a terminal.
+//
+// Until Init runs, log records go to slog.Default(), so a program that uses
+// package mfer as a library gets them wherever it sends its own slog output.
+// Init switches to the CLI's format on the stderr writer given to SetOutput.
+// Progress lines are not log records: they are written straight to the stdout
+// writer, never through slog.
 package log

 import (
+	"context"
 	"fmt"
 	"io"
+	"log/slog"
 	"os"
 	"path/filepath"
 	"runtime"
 	"sync"

-	"github.com/apex/log"
-	acli "github.com/apex/log/handlers/cli"
 	"github.com/davecgh/go-spew/spew"
-	"github.com/pterm/pterm"
+	"golang.org/x/term"
 )

 // Level represents log severity levels.
@@ -58,28 +64,97 @@ func (l Level) String() string {
 // helpers to the caller of the log package.
 const callerSkip = 2

+// Escape sequences for colored log lines.
+const (
+	ansiReset  = "\x1b[0m"
+	ansiBold   = "\x1b[1m"
+	ansiRed    = "\x1b[31m"
+	ansiYellow = "\x1b[33m"
+	ansiBlue   = "\x1b[34m"
+	ansiWhite  = "\x1b[37m"
+)
+
 //nolint:gochecknoglobals // package-level logger state by design
 var (
-	// mu protects the output writers and level
+	// mu protects the variables below
 	mu sync.RWMutex
 	// stdout is the writer for progress output
 	stdout io.Writer = os.Stdout
 	// stderr is the writer for log output
 	stderr io.Writer = os.Stderr
+	// styled is false once DisableStyling has been called
+	styled = true
+	// logger is the CLI logger Init builds; nil until Init runs
+	logger *slog.Logger
 	// currentLevel is our log level (includes Verbose)
 	currentLevel = InfoLevel
 )

+// cliHandler is the slog.Handler the CLI logs through. Each record is one
+// line: a symbol for its level right-aligned in four columns, then the
+// message padded to 25 columns. In color, the symbol is bold and the line
+// takes the level's color. Records are filtered by level before they are
+// made, so the handler takes every record it is given.
+type cliHandler struct {
+	mu    sync.Mutex
+	w     io.Writer
+	color bool
+}
+
+// Enabled reports true for every level.
+func (h *cliHandler) Enabled(context.Context, slog.Level) bool {
+	return true
+}
+
+// Handle writes the record as one line.
+func (h *cliHandler) Handle(_ context.Context, r slog.Record) error {
+	symbol, color := "•", ansiBlue
+
+	switch {
+	case r.Level >= slog.LevelError:
+		symbol, color = "⨯", ansiRed
+	case r.Level >= slog.LevelWarn:
+		color = ansiYellow
+	case r.Level < slog.LevelInfo:
+		color = ansiWhite
+	}
+
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	if !h.color {
+		_, err := fmt.Fprintf(h.w, "%4s %-25s\n", symbol, r.Message)
+
+		return err
+	}
+
+	_, err := fmt.Fprintf(h.w, "%s%s%4s%s %-25s%s\n",
+		color, ansiBold, symbol, ansiReset, r.Message, ansiReset)
+
+	return err
+}
+
+// WithAttrs returns the handler unchanged: this package's helpers never
+// attach attributes.
+func (h *cliHandler) WithAttrs([]slog.Attr) slog.Handler {
+	return h
+}
+
+// WithGroup returns the handler unchanged: this package's helpers never open
+// groups.
+func (h *cliHandler) WithGroup(string) slog.Handler {
+	return h
+}
+
 // SetOutput configures the output writers for the log package.
-// stdout is used for progress output, stderr is used for log messages.
+// stdout is used for progress output, stderr is used for log messages
+// from the next Init on.
 func SetOutput(out, err io.Writer) {
 	mu.Lock()
 	defer mu.Unlock()

 	stdout = out
 	stderr = err
-
-	pterm.SetDefaultOutput(out)
 }

 // GetStdout returns the configured stdout writer.
@@ -98,31 +173,29 @@ func GetStderr() io.Writer {
 	return stderr
 }

-// DisableStyling turns off colors and styling for terminal output.
+// DisableStyling turns off colors in log lines from the next Init on.
 func DisableStyling() {
-	pterm.DisableColor()
-	pterm.DisableStyling()
+	mu.Lock()
+	defer mu.Unlock()

-	pterm.Debug.Prefix.Text = ""
-	pterm.Info.Prefix.Text = ""
-	pterm.Success.Prefix.Text = ""
-	pterm.Warning.Prefix.Text = ""
-	pterm.Error.Prefix.Text = ""
-	pterm.Fatal.Prefix.Text = ""
+	styled = false
 }

-// Init initializes the logger with the CLI handler and default log level.
+// Init sends log records to the CLI handler on the stderr writer given to
+// SetOutput. Log lines are colored when stdout is a terminal whose TERM is
+// not dumb, unless DisableStyling has been called.
 //
-// It reconfigures the process-global apex/log logger under the write lock so
-// the global is never mutated while another goroutine holds the read lock to
-// read it in emit. Without this, parallel callers (e.g. the test suite) race
-// Init's SetLevel/SetHandler against concurrent log calls.
+// It replaces the logger under the write lock, and log calls hold the read
+// lock while they write, so once Init returns nothing writes through the
+// logger it replaced.
 func Init() {
 	mu.Lock()
 	defer mu.Unlock()

-	log.SetHandler(acli.New(stderr))
-	log.SetLevel(log.DebugLevel) // Let apex/log pass everything; we filter ourselves
+	color := styled && os.Getenv("TERM") != "dumb" &&
+		term.IsTerminal(int(os.Stdout.Fd()))
+
+	logger = slog.New(&cliHandler{w: stderr, color: color})
 }

 // isEnabled returns true if messages at the given level should be logged.
@@ -133,66 +206,87 @@ func isEnabled(l Level) bool {
 	return l >= currentLevel
 }

-// emit calls fn while holding the read lock if messages at level l are
-// enabled. Holding the read lock across the apex/log call keeps the global
-// logger from being read while Init reconfigures it under the write lock.
-func emit(l Level, fn func()) {
+// logf logs a formatted message at level l if messages at l are enabled,
+// holding the read lock while the record is written. slog has no verbose or
+// fatal level: verbose messages are logged as info records, and fatal
+// messages as error records.
+func logf(l Level, format string, args ...any) {
 	mu.RLock()
 	defer mu.RUnlock()

-	if l >= currentLevel {
-		fn()
+	if l < currentLevel {
+		return
+	}
+
+	lg := logger
+	if lg == nil {
+		lg = slog.Default()
+	}
+
+	msg := fmt.Sprintf(format, args...)
+
+	switch l {
+	case DebugLevel:
+		lg.Debug(msg)
+	case VerboseLevel, InfoLevel:
+		lg.Info(msg)
+	case WarnLevel:
+		lg.Warn(msg)
+	case ErrorLevel, FatalLevel:
+		lg.Error(msg)
 	}
 }

-// Fatalf logs a formatted message at fatal level.
+// Fatalf logs a formatted message at fatal level, then exits with status 1.
 func Fatalf(format string, args ...any) {
-	emit(FatalLevel, func() { log.Fatalf(format, args...) })
+	logf(FatalLevel, format, args...)
+	os.Exit(1)
 }

-// Fatal logs a message at fatal level.
+// Fatal logs a message at fatal level, then exits with status 1.
 func Fatal(arg string) {
-	emit(FatalLevel, func() { log.Fatal(arg) })
+	logf(FatalLevel, "%s", arg)
+	os.Exit(1)
 }

 // Errorf logs a formatted message at error level.
 func Errorf(format string, args ...any) {
-	emit(ErrorLevel, func() { log.Errorf(format, args...) })
+	logf(ErrorLevel, format, args...)
 }

 // Error logs a message at error level.
 func Error(arg string) {
-	emit(ErrorLevel, func() { log.Error(arg) })
+	logf(ErrorLevel, "%s", arg)
 }

 // Warnf logs a formatted message at warn level.
 func Warnf(format string, args ...any) {
-	emit(WarnLevel, func() { log.Warnf(format, args...) })
+	logf(WarnLevel, format, args...)
 }

 // Warn logs a message at warn level.
 func Warn(arg string) {
-	emit(WarnLevel, func() { log.Warn(arg) })
+	logf(WarnLevel, "%s", arg)
 }

 // Infof logs a formatted message at info level.
 func Infof(format string, args ...any) {
-	emit(InfoLevel, func() { log.Infof(format, args...) })
+	logf(InfoLevel, format, args...)
 }

 // Info logs a message at info level.
 func Info(arg string) {
-	emit(InfoLevel, func() { log.Info(arg) })
+	logf(InfoLevel, "%s", arg)
 }

 // Verbosef logs a formatted message at verbose level.
 func Verbosef(format string, args ...any) {
-	emit(VerboseLevel, func() { log.Infof(format, args...) })
+	logf(VerboseLevel, format, args...)
 }

 // Verbose logs a message at verbose level.
 func Verbose(arg string) {
-	emit(VerboseLevel, func() { log.Info(arg) })
+	logf(VerboseLevel, "%s", arg)
 }

 // Debugf logs a formatted message at debug level with caller location.
@@ -211,20 +305,12 @@ func Debug(arg string) {

 // DebugReal logs at debug level with caller info from the specified stack depth.
 func DebugReal(arg string, cs int) {
-	mu.RLock()
-	defer mu.RUnlock()
-
-	if DebugLevel < currentLevel {
-		return
-	}
-
 	_, callerFile, callerLine, ok := runtime.Caller(cs)
 	if !ok {
 		return
 	}

-	tag := fmt.Sprintf("%s:%d: ", filepath.Base(callerFile), callerLine)
-	log.Debug(tag + arg)
+	logf(DebugLevel, "%s:%d: %s", filepath.Base(callerFile), callerLine, arg)
 }

 // Dump logs a spew dump of the arguments at debug level.
@@ -275,12 +361,19 @@ func GetLevel() Level {

 // Progressf prints a progress message that overwrites the current line.
 // Use ProgressDone() when progress is complete to move to the next line.
+// Progress goes to the stdout writer whatever the log level.
 func Progressf(format string, args ...any) {
-	pterm.Printf("\r"+format, args...)
+	mu.Lock()
+	defer mu.Unlock()
+
+	_, _ = fmt.Fprintf(stdout, "\r"+format, args...)
 }

 // ProgressDone clears the progress line when progress is complete.
 func ProgressDone() {
-	// Clear the line with spaces and return to beginning
-	pterm.Print("\r\033[K")
+	mu.Lock()
+	defer mu.Unlock()
+
+	// Return to the start of the line and erase it
+	_, _ = fmt.Fprint(stdout, "\r\033[K")
 }
@@ -1,12 +1,229 @@
-package log_test
+//nolint:testpackage // white-box tests exercise unexported internals
+package log

 import (
+	"bytes"
+	stdlog "log"
+	"log/slog"
+	"os"
 	"testing"

-	"sneak.berlin/go/mfer/internal/log"
+	"github.com/stretchr/testify/assert"
 )

 func TestBuild(t *testing.T) {
 	t.Parallel()
-	log.Init()
+	Init()
+}
+
+// capture points the package's writers at fresh buffers and sets its level,
+// with colors off, then restores the default writers and level when the test
+// ends. The state it changes is process-wide, so tests that use it do not
+// run in parallel.
+func capture(t *testing.T, l Level) (*bytes.Buffer, *bytes.Buffer) {
+	t.Helper()
+
+	var stdout, stderr bytes.Buffer
+
+	DisableStyling()
+	SetOutput(&stdout, &stderr)
+	SetLevel(l)
+	Init()
+
+	t.Cleanup(func() {
+		SetOutput(os.Stdout, os.Stderr)
+		SetLevel(InfoLevel)
+		Init()
+	})
+
+	return &stdout, &stderr
+}
+
+// TestLevelFiltering logs at every level, through both the plain and the
+// formatting helpers, and checks that exactly the messages at or above the
+// set level are written.
+//
+//nolint:paralleltest // changes the package's process-wide writers and level
+func TestLevelFiltering(t *testing.T) {
+	messages := []struct {
+		level Level
+		text  string
+	}{
+		{DebugLevel, "debug plain"},
+		{DebugLevel, "debug formatted"},
+		{VerboseLevel, "verbose plain"},
+		{VerboseLevel, "verbose formatted"},
+		{InfoLevel, "info plain"},
+		{InfoLevel, "info formatted"},
+		{WarnLevel, "warn plain"},
+		{WarnLevel, "warn formatted"},
+		{ErrorLevel, "error plain"},
+		{ErrorLevel, "error formatted"},
+	}
+
+	levels := []Level{DebugLevel, VerboseLevel, InfoLevel, WarnLevel, ErrorLevel}
+
+	for _, set := range levels {
+		t.Run(set.String(), func(t *testing.T) {
+			stdout, stderr := capture(t, set)
+
+			Debug("debug plain")
+			Debugf("debug %s", "formatted")
+			Verbose("verbose plain")
+			Verbosef("verbose %s", "formatted")
+			Info("info plain")
+			Infof("info %s", "formatted")
+			Warn("warn plain")
+			Warnf("warn %s", "formatted")
+			Error("error plain")
+			Errorf("error %s", "formatted")
+
+			for _, m := range messages {
+				if m.level >= set {
+					assert.Contains(t, stderr.String(), m.text)
+				} else {
+					assert.NotContains(t, stderr.String(), m.text)
+				}
+			}
+
+			assert.Empty(t, stdout.String())
+		})
+	}
+}
+
+// TestLineFormat checks the exact uncolored lines: a symbol per level
+// right-aligned in four columns, then the message padded to 25 columns.
+//
+//nolint:paralleltest // changes the package's process-wide writers and level
+func TestLineFormat(t *testing.T) {
+	_, stderr := capture(t, VerboseLevel)
+
+	Infof("scanning filesystem...")
+	Verbosef("+ %s (%s)", "a.txt", "1 B")
+	Warn("short")
+	Errorf("%s", "a message longer than twenty-five columns")
+
+	want := "   • scanning filesystem...   \n" +
+		"   • + a.txt (1 B)            \n" +
+		"   • short                    \n" +
+		"   ⨯ a message longer than twenty-five columns\n"
+	assert.Equal(t, want, stderr.String())
+}
+
+// TestDebugCallerTag checks that debug lines start with the file and line
+// of the call that logged them.
+//
+//nolint:paralleltest // changes the package's process-wide writers and level
+func TestDebugCallerTag(t *testing.T) {
+	_, stderr := capture(t, DebugLevel)
+
+	Debugf("enumerating path: %s", "/tmp")
+
+	assert.Regexp(t, `^   • log_test\.go:\d+: enumerating path: /tmp\s*\n$`,
+		stderr.String())
+}
+
+// TestColoredLine checks the colored lines: the symbol bold, and the line in
+// the level's color.
+func TestColoredLine(t *testing.T) {
+	t.Parallel()
+
+	var buf bytes.Buffer
+
+	lg := slog.New(&cliHandler{w: &buf, color: true})
+	lg.Debug("debug")
+	lg.Info("info")
+	lg.Warn("warn")
+	lg.Error("error")
+
+	want := "\x1b[37m\x1b[1m   •\x1b[0m debug                    \x1b[0m\n" +
+		"\x1b[34m\x1b[1m   •\x1b[0m info                     \x1b[0m\n" +
+		"\x1b[33m\x1b[1m   •\x1b[0m warn                     \x1b[0m\n" +
+		"\x1b[31m\x1b[1m   ⨯\x1b[0m error                    \x1b[0m\n"
+	assert.Equal(t, want, buf.String())
+}
+
+// TestRecordLevels checks the slog level of the record each helper logs,
+// through slog's text handler with the time left out. slog has no verbose
+// level, so verbose messages are info records.
+//
+//nolint:paralleltest // changes the package's process-wide logger and level
+func TestRecordLevels(t *testing.T) {
+	var buf bytes.Buffer
+
+	capture(t, DebugLevel)
+
+	opts := &slog.HandlerOptions{
+		Level: slog.LevelDebug,
+		ReplaceAttr: func(_ []string, a slog.Attr) slog.Attr {
+			if a.Key == slog.TimeKey {
+				return slog.Attr{}
+			}
+
+			return a
+		},
+	}
+
+	mu.Lock()
+	logger = slog.New(slog.NewTextHandler(&buf, opts))
+	mu.Unlock()
+
+	Debugf("debug")
+	Verbosef("verbose")
+	Infof("info")
+	Warnf("warn")
+	Errorf("error")
+
+	assert.Regexp(t, `^level=DEBUG msg="log_test\.go:\d+: debug"\n`+
+		"level=INFO msg=verbose\n"+
+		"level=INFO msg=info\n"+
+		"level=WARN msg=warn\n"+
+		"level=ERROR msg=error\n$", buf.String())
+}
+
+// TestProgress checks that progress lines go to the stdout writer whatever
+// the log level, each starting with a carriage return so it overwrites the
+// last, and that ProgressDone erases the line.
+//
+//nolint:paralleltest // changes the package's process-wide writers and level
+func TestProgress(t *testing.T) {
+	stdout, stderr := capture(t, ErrorLevel)
+
+	Progressf("Scanning: %d files found", 1000)
+	Progressf("Scanning: %d files found", 2000)
+	ProgressDone()
+
+	assert.Equal(t,
+		"\rScanning: 1000 files found\rScanning: 2000 files found\r\x1b[K",
+		stdout.String())
+	assert.Empty(t, stderr.String())
+}
+
+// TestBeforeInit checks that records go to slog.Default() until Init runs,
+// still filtered by the package's level. slog's default handler writes
+// through the standard library's log package.
+//
+//nolint:paralleltest // changes the package's process-wide logger
+func TestBeforeInit(t *testing.T) {
+	var buf bytes.Buffer
+
+	flags := stdlog.Flags()
+
+	stdlog.SetOutput(&buf)
+	stdlog.SetFlags(0)
+
+	mu.Lock()
+	logger = nil
+	mu.Unlock()
+
+	t.Cleanup(func() {
+		stdlog.SetOutput(os.Stderr)
+		stdlog.SetFlags(flags)
+		Init()
+	})
+
+	Infof("loaded manifest with %d files", 3)
+	Verbose("not shown at info level")
+
+	assert.Equal(t, "INFO loaded manifest with 3 files\n", buf.String())
 }