finally actually starting work on the editor!

Cargo.lock

@@ -118,6 +118,15 @@ dependencies = [
  "pkg-config",
 ]
 
+[[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 = "arboard"
 version = "3.2.0"
@@ -331,6 +340,21 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "chrono"
+version = "0.4.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16b0a3d9ed01224b22057780a37bb8c5dbfe1be8ba48678e7bf57ec4b385411f"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-integer",
+ "num-traits",
+ "time 0.1.45",
+ "wasm-bindgen",
+ "winapi",
+]
+
 [[package]]
 name = "clang-sys"
 version = "1.4.0"
@@ -399,6 +423,16 @@ dependencies = [
  "objc",
 ]
 
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
 [[package]]
 name = "combine"
 version = "4.6.6"
@@ -543,6 +577,50 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b365fabc795046672053e29c954733ec3b05e4be654ab130fe8f1f94d7051f35"
 
+[[package]]
+name = "cxx"
+version = "1.0.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc831ee6a32dd495436e317595e639a587aa9907bef96fe6e6abc290ab6204e9"
+dependencies = [
+ "cc",
+ "cxxbridge-flags",
+ "cxxbridge-macro",
+ "link-cplusplus",
+]
+
+[[package]]
+name = "cxx-build"
+version = "1.0.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94331d54f1b1a8895cd81049f7eaaaef9d05a7dcb4d1fd08bf3ff0806246789d"
+dependencies = [
+ "cc",
+ "codespan-reporting",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "scratch",
+ "syn",
+]
+
+[[package]]
+name = "cxxbridge-flags"
+version = "1.0.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48dcd35ba14ca9b40d6e4b4b39961f23d835dbb8eed74565ded361d93e1feb8a"
+
+[[package]]
+name = "cxxbridge-macro"
+version = "1.0.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81bbeb29798b407ccd82a3324ade1a7286e0d29851475990b612670f6f5124d2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "darling"
 version = "0.13.4"
@@ -913,7 +991,7 @@ dependencies = [
  "line-wrap",
  "quick-xml",
  "serde",
- "time",
+ "time 0.3.17",
 ]
 
 [[package]]
@@ -934,7 +1012,7 @@ checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
 dependencies = [
  "cfg-if",
  "libc",
- "wasi",
+ "wasi 0.11.0+wasi-snapshot-preview1",
 ]
 
 [[package]]
@@ -1039,6 +1117,30 @@ version = "3.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d13cdbd5dbb29f9c88095bbdc2590c9cba0d0a1269b983fef6b2cdd7e9f4db1"
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.53"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64c122667b287044802d6ce17ee2ddf13207ed924c712de9a66a5814d5b64765"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "winapi",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0703ae284fc167426161c2e3f1da3ea71d94b21bedbcc9494e92b28e334e3dca"
+dependencies = [
+ "cxx",
+ "cxx-build",
+]
+
 [[package]]
 name = "ident_case"
 version = "1.0.1"
@@ -1198,6 +1300,15 @@ dependencies = [
  "safemem",
 ]
 
+[[package]]
+name = "link-cplusplus"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecd207c9c713c34f95a097a5b029ac2ce6010530c7b49d7fea24d977dede04f5"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.9"
@@ -1302,7 +1413,7 @@ checksum = "e5d732bc30207a6423068df043e3d02e0735b155ad7ce1a6f76fe2baa5b158de"
 dependencies = [
  "libc",
  "log",
- "wasi",
+ "wasi 0.11.0+wasi-snapshot-preview1",
  "windows-sys 0.42.0",
 ]
 
@@ -1451,6 +1562,16 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "num-integer"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.15"
@@ -1635,6 +1756,7 @@ name = "pipedash"
 version = "0.1.0"
 dependencies = [
  "base64 0.21.0",
+ "chrono",
  "eframe",
  "flate2",
  "gd_plist",
@@ -1821,6 +1943,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
+[[package]]
+name = "scratch"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddccb15bcce173023b3fedd9436f882a0739b8dfb45e4f6b6002bee5929f61b2"
+
 [[package]]
 name = "sctk-adwaita"
 version = "0.4.3"
@@ -2045,6 +2173,15 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be55cf8942feac5c765c2c993422806843c9a9a45d4d5c407ad6dd2ea95eb9b6"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.38"
@@ -2065,6 +2202,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "time"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b797afad3f312d1c66a56d11d0316f916356d11bd158fbc6ca6389ff6bf805a"
+dependencies = [
+ "libc",
+ "wasi 0.10.0+wasi-snapshot-preview1",
+ "winapi",
+]
+
 [[package]]
 name = "time"
 version = "0.3.17"
@@ -2188,6 +2336,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-width"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
+
 [[package]]
 name = "url"
 version = "2.3.1"
@@ -2222,6 +2376,12 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "wasi"
+version = "0.10.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
+
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"

Cargo.toml

@@ -12,3 +12,4 @@ home = {version = "0.5.4"}
 base64 = {version = "0.21.0"}
 flate2 = {version = "1.0.25"}
 gd_plist = {git = "https://github.com/Syudagye/gd-plist.git", version = "1.4.0"}
+chrono = {version = "0.4.23"}

src/main.rs

@@ -1,4 +1,5 @@
 mod gd;
+mod music;
 
 use eframe;
 use eframe::egui;
@@ -30,6 +31,9 @@ enum Message {
 struct Editor {
     scroll_pos: f32,
     pts_per_second: f32,
+    beats_per_bar: f32,
+    subdivisions: f32,
+    beat_rate: music::BeatRate,
 }
 
 type EditorWidget<'a> = &'a mut Editor;
@@ -67,6 +71,9 @@ impl PipeDash {
             editor: Editor {
                 scroll_pos: 0f32,
                 pts_per_second: 5f32,
+                beats_per_bar: 4.0,
+                subdivisions: 4.0,
+                beat_rate: music::StaticBeatRate::from_bpm(120f32).into(),
             }
         }
     }

src/music.rs

@@ -0,0 +1,29 @@
+// TODO: SWITCH BEAT RATE TO CHANGE ON BEATS INSTEAD OF DURATIONS, 
+// TODO: BECAUSE THAT WAS A STUPID IDEA
+
+use chrono::Duration;
+use std::collections::BTreeMap;
+
+/// Like BPM, but not necessarily represented in terms of minutes
+/// Only BPM jumps for now; no smooth accel/decel
+pub struct BeatRate {
+    initial: StaticBeatRate,
+    changes: BTreeMap<Duration, StaticBeatRate>,
+}
+
+pub struct StaticBeatRate(Duration);
+
+impl StaticBeatRate {
+    pub fn from_bpm(bpm: f32) -> Self {
+        Self(Duration::microseconds(60_000_000 / bpm as i64))
+    }
+}
+
+impl From<StaticBeatRate> for BeatRate {
+    fn from(rhs: StaticBeatRate) -> Self {
+        Self {
+            initial: rhs,
+            changes: BTreeMap::new(),
+        }
+    }
+}