full lib (no cli)

.gitignore

@@ -1 +1,2 @@
 /target
+.vscode/settings.json

Cargo.lock

@@ -2,6 +2,21 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.19"
@@ -65,29 +80,29 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
 
 [[package]]
-name = "autotools"
+name = "base64"
-version = "0.2.7"
+version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef941527c41b0fc0dd48511a8154cd5fc7e29200a0ff8b7203c5d777dbc795cf"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
-dependencies = [
- "cc",
-]
 
 [[package]]
 name = "bliplab"
 version = "0.0.1"
 dependencies = [
+ "anyhow",
  "bliplib",
  "clap",
+ "derive-new",
  "serde",
  "serde_json",
+ "serde_with",
 ]
 
 [[package]]
 name = "bliplib"
-version = "0.2.4"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f0f674b50c271210cc1743a452172d8c52c5380598cd92e292848fae5997dc2"
+checksum = "ef6fa4b24cf72ecbbdf06c2b2790ab7632056988217887d398139f4cfbc29525"
 dependencies = [
  "anyhow",
  "cfg-if",
@@ -95,34 +110,21 @@ dependencies = [
  "derive_builder",
  "derive_wrapper",
  "fasteval",
- "flacenc",
  "fon",
  "getset",
- "hound",
  "lazy_static",
  "log",
- "mp3lame-encoder",
  "nom",
  "nom_locate",
- "raw_audio",
  "strum",
  "thiserror",
 ]
 
 [[package]]
-name = "block-buffer"
+name = "bumpalo"
-version = "0.10.4"
+version = "3.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+checksum = "793db76d6187cd04dff33004d8e6c9cc4e05cd330500379d2394209271b4aeee"
-dependencies = [
- "generic-array",
-]
-
-[[package]]
-name = "built"
-version = "0.7.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56ed6191a7e78c36abdb16ab65341eefd73d64d303fffccdbb00d51e4205967b"
 
 [[package]]
 name = "bytecount"
@@ -130,12 +132,6 @@ version = "0.6.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "175812e0be2bccb6abe50bb8d566126198344f707e304f45c648fd8f2cc0365e"
 
-[[package]]
-name = "byteorder"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
-
 [[package]]
 name = "cc"
 version = "1.2.27"
@@ -151,6 +147,19 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9555578bc9e57714c812a1f84e4fc5b4d21fcb063490c624de019f7464c91268"
 
+[[package]]
+name = "chrono"
+version = "0.4.41"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c469d952047f47f91b68d1cba3f10d63c11d73e4636f24f08daf0278abf01c4d"
+dependencies = [
+ "android-tzdata",
+ "iana-time-zone",
+ "num-traits",
+ "serde",
+ "windows-link",
+]
+
 [[package]]
 name = "clap"
 version = "4.5.40"
@@ -198,44 +207,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
 
 [[package]]
-name = "crc"
+name = "core-foundation-sys"
-version = "2.1.0"
+version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49fc9a695bca7f35f5f4c15cddc84415f66a74ea78eef08e90c5024f2b540e23"
+checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
-dependencies = [
- "crc-catalog",
-]
-
-[[package]]
-name = "crc-catalog"
-version = "1.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ccaeedb56da03b09f598226e25e80088cb4cd25f316e6e4df7d695f0feeb1403"
-
-[[package]]
-name = "crossbeam-channel"
-version = "0.5.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82b8f8f868b36967f9606790d1903570de9ceaf870a7bf9fbbd3016d636a2cb2"
-dependencies = [
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.8.21"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0a5c400df2834b80a4c3327b3aad3a4c4cd4de0629063962b03235697506a28"
-
-[[package]]
-name = "crypto-common"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
-dependencies = [
- "generic-array",
- "typenum",
-]
 
 [[package]]
 name = "darling"
@@ -272,6 +247,16 @@ dependencies = [
  "syn 2.0.103",
 ]
 
+[[package]]
+name = "deranged"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c9e6a11ca8224451684bc0d7d5a7adbf8f2fd6887261a1cfc3c0432f9d4068e"
+dependencies = [
+ "powerfmt",
+ "serde",
+]
+
 [[package]]
 name = "derive-new"
 version = "0.7.0"
@@ -325,14 +310,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "digest"
+name = "dyn-clone"
-version = "0.10.7"
+version = "1.0.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+checksum = "1c7a8fb8a9fbf66c1f703fe16184d10ca0ee9d23be5b4436400408ba54a95005"
-dependencies = [
+
- "block-buffer",
+[[package]]
- "crypto-common",
+name = "equivalent"
-]
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
 [[package]]
 name = "fasteval"
@@ -340,24 +327,6 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4f4cdac9e4065d7c48e30770f8665b8cef9a3a73a63a4056a33a5f395bc7cf75"
 
-[[package]]
-name = "flacenc"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb6da14d3c6605689b5c9ed5187a5218a6d3888e14b747bc18fd4e4bafd452bd"
-dependencies = [
- "built",
- "crc",
- "crossbeam-channel",
- "heapless",
- "log",
- "md-5",
- "num-traits",
- "rustversion",
- "seq-macro",
- "serde",
-]
-
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -370,16 +339,6 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9716a0a1c5bba06eeccce22ff33a89dc961d88f02f0d450a55c1bade6cbcdd5"
 
-[[package]]
-name = "generic-array"
-version = "0.14.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
-dependencies = [
- "typenum",
- "version_check",
-]
-
 [[package]]
 name = "getset"
 version = "0.1.6"
@@ -393,24 +352,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "hash32"
+name = "hashbrown"
-version = "0.3.1"
+version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47d60b12902ba28e2730cd37e95b8c9223af2808df9e902d4df49588d1470606"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
-dependencies = [
- "byteorder",
-]
 
 [[package]]
-name = "heapless"
+name = "hashbrown"
-version = "0.8.0"
+version = "0.15.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0bfb9eb618601c89945a70e254898da93b13be0388091d42117462b265bb3fad"
+checksum = "5971ac85611da7067dbfcabef3c70ebb5606018acd9e2a3903a0da507521e0d5"
-dependencies = [
- "hash32",
- "serde",
- "stable_deref_trait",
-]
 
 [[package]]
 name = "heck"
@@ -419,10 +370,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
 [[package]]
-name = "hound"
+name = "hex"
-version = "3.5.1"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62adaabb884c94955b19907d60019f4e145d091c75345379e70d1ee696f7854f"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+
+[[package]]
+name = "iana-time-zone"
+version = "0.1.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0c919e5debc312ad217002b8048a17b7d83f80703865bbfcfebb0458b0b27d8"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
 
 [[package]]
 name = "ident_case"
@@ -430,6 +405,28 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
+[[package]]
+name = "indexmap"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
+dependencies = [
+ "autocfg",
+ "hashbrown 0.12.3",
+ "serde",
+]
+
+[[package]]
+name = "indexmap"
+version = "2.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cea70ddb795996207ad57735b50c5982d8844f38ba9ee5f1aedcfb708a2aa11e"
+dependencies = [
+ "equivalent",
+ "hashbrown 0.15.4",
+ "serde",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
@@ -442,6 +439,16 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
 
+[[package]]
+name = "js-sys"
+version = "0.3.77"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cfaf33c695fc6e08064efbc1f72ec937429614f25eef83af942d0e227c3a28f"
+dependencies = [
+ "once_cell",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
@@ -460,43 +467,12 @@ version = "0.4.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
 
-[[package]]
-name = "md-5"
-version = "0.10.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d89e7ee0cfbedfc4da3340218492196241d89eefb6dab27de5df917a6d2e78cf"
-dependencies = [
- "cfg-if",
- "digest",
-]
-
 [[package]]
 name = "memchr"
 version = "2.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32a282da65faaf38286cf3be983213fcf1d2e2a58700e808f83f4ea9a4804bc0"
 
-[[package]]
-name = "mp3lame-encoder"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc8c8b5cdbe788ccd1098c3d3635298a011cffdebdd3460c9ca5060a7551557b"
-dependencies = [
- "libc",
- "mp3lame-sys",
-]
-
-[[package]]
-name = "mp3lame-sys"
-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cba8102a6f54cde0eeee828fa06c2c6353e384aa4a487c3f9197b39e576fb174"
-dependencies = [
- "autotools",
- "cc",
- "libc",
-]
-
 [[package]]
 name = "nom"
 version = "8.0.0"
@@ -517,6 +493,12 @@ dependencies = [
  "nom",
 ]
 
+[[package]]
+name = "num-conv"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -526,12 +508,24 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "once_cell"
+version = "1.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+
 [[package]]
 name = "once_cell_polyfill"
 version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4895175b425cb1f87721b59f0f286c2092bd4af812243672510e1ac53e2e0ad"
 
+[[package]]
+name = "powerfmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
+
 [[package]]
 name = "proc-macro-error-attr2"
 version = "2.0.0"
@@ -591,12 +585,23 @@ dependencies = [
 ]
 
 [[package]]
-name = "raw_audio"
+name = "ref-cast"
-version = "0.0.1"
+version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b277c1a2c0af6599a15b81adaceb3c0d1072423dff7adca77afd386ffd1b33e1"
+checksum = "4a0ae411dbe946a674d89546582cea4ba2bb8defac896622d6496f14c23ba5cf"
 dependencies = [
- "fon",
+ "ref-cast-impl",
+]
+
+[[package]]
+name = "ref-cast-impl"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1165225c21bff1f3bbce98f5a1f889949bc902d3575308cc7b0de30b4f6d27c7"
+dependencies = [
+ "proc-macro2 1.0.95",
+ "quote 1.0.40",
+ "syn 2.0.103",
 ]
 
 [[package]]
@@ -612,10 +617,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
 
 [[package]]
-name = "seq-macro"
+name = "schemars"
-version = "0.3.6"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bc711410fbe7399f390ca1c3b60ad0f53f80e95c5eb935e52268a0e2cd49acc"
+checksum = "4cd191f9397d57d581cddd31014772520aa448f65ef991055d7f61582c65165f"
+dependencies = [
+ "dyn-clone",
+ "ref-cast",
+ "serde",
+ "serde_json",
+]
 
 [[package]]
 name = "serde"
@@ -649,18 +660,43 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_with"
+version = "3.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf65a400f8f66fb7b0552869ad70157166676db75ed8181f8104ea91cf9d0b42"
+dependencies = [
+ "base64",
+ "chrono",
+ "hex",
+ "indexmap 1.9.3",
+ "indexmap 2.9.0",
+ "schemars",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "serde_with_macros",
+ "time",
+]
+
+[[package]]
+name = "serde_with_macros"
+version = "3.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81679d9ed988d5e9a5e6531dc3f2c28efbd639cbd1dfb628df08edea6004da77"
+dependencies = [
+ "darling",
+ "proc-macro2 1.0.95",
+ "quote 1.0.40",
+ "syn 2.0.103",
+]
+
 [[package]]
 name = "shlex"
 version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
-[[package]]
-name = "stable_deref_trait"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
-
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -732,10 +768,35 @@ dependencies = [
 ]
 
 [[package]]
-name = "typenum"
+name = "time"
-version = "1.18.0"
+version = "0.3.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1dccffe3ce07af9386bfd29e80c0ab1a8205a2fc34e4bcd40364df902cfa8f3f"
+checksum = "8a7619e19bc266e0f9c5e6686659d394bc57973859340060a69221e57dbc0c40"
+dependencies = [
+ "deranged",
+ "itoa",
+ "num-conv",
+ "powerfmt",
+ "serde",
+ "time-core",
+ "time-macros",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9e9a38711f559d9e3ce1cdb06dd7c5b8ea546bc90052da6d06bb76da74bb07c"
+
+[[package]]
+name = "time-macros"
+version = "0.2.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3526739392ec93fd8b359c8e98514cb3e8e021beb4e5f597b00a0221f8ed8a49"
+dependencies = [
+ "num-conv",
+ "time-core",
+]
 
 [[package]]
 name = "unicode-ident"
@@ -756,10 +817,121 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
 [[package]]
-name = "version_check"
+name = "wasm-bindgen"
-version = "0.9.5"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+]
+
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+ "bumpalo",
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+ "proc-macro2 1.0.95",
+ "quote 1.0.40",
+ "syn 2.0.103",
+ "wasm-bindgen-shared",
+]
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+ "syn 2.0.103",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
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+ "unicode-ident",
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+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
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+ "syn 2.0.103",
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+dependencies = [
+ "windows-link",
+]
 
 [[package]]
 name = "windows-sys"

Cargo.toml

@@ -11,13 +11,16 @@ repository = "https://gitdab.com/breval/blip"
 name = "bliplab"
 
 [dependencies]
-bliplib = "0.2.4"
+anyhow = { version = "1", optional = true }
+bliplib = { version = "0.2.5", default-features = false }
 clap = { version = "4.5", features = ["derive"], optional = true }
+derive-new = "0.7.0"
 serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
+serde_json = { version = "1.0", optional = true }
+serde_with = "3.13"
 
 [features]
-bin = ["clap"]
+bin = ["clap", "serde_json", "anyhow"]
 
 [[bin]]
 name = "bliplab"

src/cli/main.rs

@@ -0,0 +1,42 @@
+//! See [BLIPlab](https://docs.rs/bliplab)
+
+use anyhow::Context;
+use bliplab::{Channel, PathOrString, Song, VariableChange};
+
+fn main() -> anyhow::Result<()> {
+    let stringified = serde_json::to_string_pretty(&Song::new(
+        Default::default(),
+        [(
+            "Piano".into(),
+            Channel::new(
+                PathOrString::String("hi".into()),
+                vec!["do", "ré", "mi"].into_iter().map(Into::into),
+                "sin(2*pi()*(442*2^((n+1)/N))*t)"
+                    .parse()
+                    .context("failed to parse instrument expression")?,
+                [
+                    ('l', 4f64),
+                    ('L', 0.0),
+                    ('t', 0.0),
+                    ('T', 60.0),
+                    ('N', 12.0),
+                ],
+                [],
+                [(
+                    "L".into(),
+                    VariableChange::new(
+                        'L',
+                        "2^(2-log(2, l))*(60/T)"
+                            .parse()
+                            .context("failed to parse length expression")?,
+                    ),
+                )],
+            ),
+        )],
+    ))
+    .context("failed to serialize the song")?;
+
+    println!("{}", stringified);
+
+    Ok(())
+}

src/lib.rs

@@ -0,0 +1,115 @@
+//! BLIPlab is a tool to help you write a song for more than one instrument.
+//!
+//! [BLIP](https://crates.io/crates/bliplib) works for just one instrument.
+//! This tool can turn command-line options into a single file using serialization (with serde).
+//!
+//! The CLI can be installed by enabling the "bin" feature :
+//! ```bash
+//! cargo install bliplab --features bin
+//! ```
+//! A variety of data formats other than JSON will be available by enabling other features.
+
+use std::{borrow::Cow, collections::HashMap, path::PathBuf};
+
+use bliplib::compiler::Expression;
+use derive_new::new;
+use serde::{Deserialize, Serialize};
+use serde_with::{DisplayFromStr, serde_as};
+
+/// Entry point to a BLIPlab song. Made of BLIP channels.
+#[derive(new, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct Song<'a> {
+    #[serde(default)]
+    global_variables: Globals,
+    #[new(into_iter = "(Cow<'a, str>, Channel<'a>)")]
+    channels: HashMap<Cow<'a, str>, Channel<'a>>,
+}
+
+/// Global variables used by the compiler for rendering every sample.
+/// They are made global for the sake of consistency but can be modified.
+#[derive(new, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct Globals {
+    #[new(into)]
+    absolute_length: char,
+    #[new(into)]
+    note_index: char,
+}
+
+impl Default for Globals {
+    fn default() -> Self {
+        Self::new('L', 'n')
+    }
+}
+
+/// BLIP channel. Contains a song for just one instrument.
+#[serde_as]
+#[derive(new, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct Channel<'a> {
+    input: PathOrString<'a>,
+    #[new(into_iter = "Cow<'a, str>")]
+    notes: Vec<Cow<'a, str>>,
+    #[serde_as(as = "DisplayFromStr")]
+    instrument: Expression,
+    #[new(into_iter = "(char, f64)")]
+    #[serde(default)]
+    variables: HashMap<char, f64>,
+    #[new(into_iter = "(char, Cow<'a, str>)")]
+    #[serde(default)]
+    macros: HashMap<char, Cow<'a, str>>,
+    #[new(into_iter = "(Cow<'a, str>, VariableChange)")]
+    #[serde(default = "default_slope")]
+    slopes: HashMap<Cow<'a, str>, VariableChange>,
+}
+
+fn default_slope<'a>() -> HashMap<Cow<'a, str>, VariableChange> {
+    [(
+        "L".into(),
+        VariableChange::new(
+            'L',
+            "2^(2-log(2, l))*(60/T)"
+                .parse()
+                .expect("oops, my default length expression doesn't work"),
+        ),
+    )]
+    .into()
+}
+
+/// Same as [bliplib::compiler::VariableChange] but with named fields and serde support.
+/// Both types are compatible with [From].
+#[serde_as]
+#[derive(new, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct VariableChange {
+    target: char,
+    #[serde_as(as = "DisplayFromStr")]
+    change: Expression,
+}
+
+impl From<bliplib::compiler::VariableChange> for VariableChange {
+    fn from(value: bliplib::compiler::VariableChange) -> Self {
+        Self {
+            target: value.0,
+            change: value.1,
+        }
+    }
+}
+
+impl From<VariableChange> for bliplib::compiler::VariableChange {
+    fn from(value: VariableChange) -> Self {
+        Self(value.target, value.change)
+    }
+}
+
+/// BLIP [Channel] MML input, either a file or a string.
+#[derive(Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+#[serde(deny_unknown_fields)]
+pub enum PathOrString<'a> {
+    /// Read the MML from a BLIP file.
+    Path(PathBuf),
+    /// Read the MML from the specified string.
+    String(Cow<'a, str>),
+}