From abf49ddcb789cc31fd5595a142eff897f847cab4 Mon Sep 17 00:00:00 2001
From: Dan Johnson <ComputerDruid@gmail.com>
Date: Fri, 29 Aug 2025 11:53:46 -0700
Subject: [PATCH 1/2] Add load subcommand

---
 CHANGELOG.md     |   3 ++
 Cargo.lock       |  16 ++++++
 Cargo.toml       |   1 +
 src/load.rs      | 129 +++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs      |  31 ++++++++++++
 src/save.rs      |  21 +++-----
 src/test_util.rs |  14 +++++
 7 files changed, 201 insertions(+), 14 deletions(-)
 create mode 100644 src/load.rs
 create mode 100644 src/test_util.rs

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c25d012..89b1f0e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## Unreleased
 
+### Added
+- New subcommand: `load`, which loads blueprint books saved with `save`
+
 ## Version 0.1.5
 
 ### Added
diff --git a/Cargo.lock b/Cargo.lock
index d5fe669..792bb2a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -267,6 +267,12 @@ version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d0881ea181b1df73ff77ffaaf9c7544ecc11e82fba9b5f27b262a3c73a332555"
 
+[[package]]
+name = "either"
+version = "1.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
+
 [[package]]
 name = "equivalent"
 version = "1.0.2"
@@ -291,6 +297,7 @@ dependencies = [
  "clap",
  "crossterm",
  "flate2",
+ "itertools",
  "jaq-core",
  "jaq-json",
  "jaq-std",
@@ -394,6 +401,15 @@ version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
 
+[[package]]
+name = "itertools"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.15"
diff --git a/Cargo.toml b/Cargo.toml
index 27d7702..c6127ff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,7 @@ base64 = "0.22.1"
 clap = { version = "4.5.42", features = ["derive"] }
 crossterm = { version = "0.29.0", features = ["osc52"] }
 flate2 = { version = "1.1.2", default-features = false, features = ["zlib-rs"] }
+itertools = "0.14.0"
 sanitize-filename = "0.6.0"
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.142"
diff --git a/src/load.rs b/src/load.rs
new file mode 100644
index 0000000..fe8ddef
--- /dev/null
+++ b/src/load.rs
@@ -0,0 +1,129 @@
+use std::{fs, path::Path};
+
+use itertools::Itertools;
+
+fn load_file(path: &Path) -> serde_json::Value {
+    serde_json::from_str(
+        &fs::read_to_string(path)
+            .unwrap_or_else(|e| panic!("error reading {path:?}: {e}", path = &path)),
+    )
+    .unwrap_or_else(|e| panic!("invalid json in {path:?}: {e}"))
+}
+pub fn load(path: &Path) -> serde_json::Value {
+    let files = match path
+        .read_dir()
+        .and_then(|files| files.collect::<Result<Vec<_>, _>>())
+    {
+        Ok(files) => files,
+        Err(e) => match e.kind() {
+            std::io::ErrorKind::NotADirectory => return load_file(path),
+            _ => {
+                panic!("error loading {path:?}: {e}");
+            }
+        },
+    };
+    let mut book_json: Option<serde_json::Value> = None;
+    let mut entries = vec![];
+    for file in files {
+        let path = file.path();
+        let json = load(&path);
+        if file.file_name() == "book.json" {
+            book_json = Some(json)
+        } else {
+            let json_index: Option<u64> = json.get("index").map(|val| {
+                val.as_number()
+                    .and_then(|num| num.as_u64())
+                    .unwrap_or_else(|| panic!("invalid index {val:?} in {path:?}"))
+            });
+            let index = if let Some(filename) = file.file_name().to_str()
+                && let Some((first_word, _)) = filename.split_once(' ')
+                && let Ok(filename_index) = first_word.parse::<u64>()
+            {
+                if let Some(json_index) = json_index {
+                    if filename_index != json_index {
+                        eprintln!(
+                            "WARN: {path:?} index mismatch; file contains index {json_index}, using index {filename_index} from filename"
+                        )
+                    }
+                } else {
+                    eprintln!(
+                        "WARN: {path:?} missing index, assuming index {filename_index} from filename"
+                    )
+                }
+                filename_index
+            } else {
+                json_index.unwrap_or_else(|| {
+                    panic!("error: {path:?} missing index, can't load into book")
+                })
+            };
+
+            entries.push((path, index, json));
+        }
+    }
+    let book_json_path = path.join("book.json");
+    let Some(mut book_json) = book_json else {
+        panic!("{book_json_path:?} not found");
+    };
+    entries.sort_by_key(|(_path, index, _json)| *index);
+    for (l, r) in entries.iter().tuple_windows() {
+        if l.1 == r.1 {
+            panic!(
+                "error: {l:?} and {r:?} have same index {index}",
+                l = l.0,
+                r = r.0,
+                index = l.1
+            );
+        }
+    }
+    let blueprints = book_json
+        .get_mut("blueprint_book")
+        .unwrap_or_else(|| panic!("error: {book_json_path:?} not a blueprint book??"))
+        .get_mut("blueprints")
+        .unwrap_or_else(|| panic!("error: {book_json_path:?} missing empty blueprints array"))
+        .as_array_mut()
+        .unwrap_or_else(|| {
+            panic!("error: {book_json_path:?} blueprints wrong type (expected array)")
+        });
+    if !blueprints.is_empty() {
+        panic!("error: {book_json_path:?} blueprints array not empty")
+    }
+    *blueprints = entries
+        .into_iter()
+        .map(|(_path, _index, json)| json)
+        .collect();
+    book_json
+}
+
+#[cfg(test)]
+mod tests {
+    use std::str::FromStr as _;
+
+    use crate::test_util::read_dir_unwrap;
+
+    use super::*;
+
+    // See also save tests which check round-tripping.
+
+    #[test]
+    #[should_panic = "have same index 1"]
+    fn test_load_duplicate() {
+        let bp = "0eNrlUdtqg0AQ/ZUwz2uIJkYU8pIPCH0vRVadliV7sXsJDeK/d1SiLYS00Mc+ztk5lz3TQSUDtlZoX1bGnKHoFsRB8fxlHN5EbfQEO/GmuRwwzRVCAVWQ50hoh9ajhZ6B0A1+QBH3LwxQe+EFTtRxuJY6qIo2i5jdl2DQGkcsowcXUkrybJ0yuBIly9cpWTTCYj1txAmDVyGJOJnc3Gfx2rQt2shYJOX3wCVlIDjo2ihFCow2VMst94ZCwQGG3MFhOat6G3AAhUc1pJ2LYSB5hVQGHJ9WJ7JbxYRdiDRGS/dJvsvzNNum212WLNVsetb9+wNYPgJ/KP/novf3mNHY93K7EzqPzeo4oZy+dcHyJvAbl/iRy3e9zQO9/hMTWy6D";
+        let dir = tempfile::tempdir().unwrap();
+        let json = crate::blueprint::blueprint_to_json(bp);
+        let json = serde_json::Value::from_str(&json).expect("should contain valid json");
+        crate::save::save(json.clone(), Some(dir.path()));
+        let files = read_dir_unwrap(dir.path());
+        assert_eq!(files, &["Untitled"]);
+        let subfiles = read_dir_unwrap(&dir.path().join("Untitled"));
+        assert_eq!(subfiles, ["0 BP Name 1.json", "1 Nested Book", "book.json"]);
+
+        std::fs::rename(
+            dir.path().join("Untitled").join("0 BP Name 1.json"),
+            dir.path().join("Untitled").join("1 BP Name 1.json"),
+        )
+        .unwrap();
+
+        let loaded_json = load(&dir.path().join("Untitled"));
+        assert_eq!(loaded_json, json)
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 0dc2a75..586eed8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,13 @@
 mod blueprint;
 mod json_walk;
+mod load;
 mod save;
+#[cfg(test)]
+mod test_util;
 
 use std::fmt::Write;
 use std::io::{Read, stderr, stdin};
+use std::path::PathBuf;
 use std::str::FromStr;
 
 use blueprint::{blueprint_to_json, json_to_blueprint};
@@ -45,6 +49,16 @@ enum Commands {
     },
     /// Saves blueprint as a .json file, or as a directory of json files if it's a blueprint book.
     Save { blueprint_string: Option<String> },
+    /// Loads previously-saved blueprints from the given file or directory.
+    Load {
+        file: PathBuf,
+        /// Sends the output to the clipboard
+        #[arg(long)]
+        to_clipboard: bool,
+        /// Add the current git commit to the description as a tag.
+        #[arg(long)]
+        stamp: bool,
+    },
 }
 
 mod terminal;
@@ -140,6 +154,23 @@ impl Commands {
 
                 save::save(json, None);
             }
+            Commands::Load {
+                file,
+                to_clipboard,
+                stamp,
+            } => {
+                let json = load::load(&file);
+                if stamp {
+                    unimplemented!();
+                }
+                let bp = json_to_blueprint(json);
+                if to_clipboard {
+                    crossterm::execute!(stderr(), CopyToClipboard::to_clipboard_from(bp)).unwrap();
+                    println!("blueprint copied to clipboard.")
+                } else {
+                    println!("{bp}");
+                }
+            }
         }
     }
 }
diff --git a/src/save.rs b/src/save.rs
index c6e1575..a3be4a9 100644
--- a/src/save.rs
+++ b/src/save.rs
@@ -205,20 +205,9 @@ pub fn save(mut json: serde_json::Value, dir: Option<&Path>) {
 
 #[cfg(test)]
 mod tests {
-    use std::{ffi::OsString, fs::read_dir, str::FromStr as _};
+    use std::str::FromStr as _;
 
-    #[track_caller]
-    fn read_dir_unwrap(path: &Path) -> Vec<OsString> {
-        let mut result = read_dir(path)
-            .unwrap_or_else(|e| panic!("error reading directory {path:?}: {e}"))
-            .map(|f| {
-                f.unwrap_or_else(|e| panic!("error while reading directory {path:?}: {e}"))
-                    .file_name()
-            })
-            .collect::<Vec<_>>();
-        result.sort();
-        result
-    }
+    use crate::test_util::read_dir_unwrap;
 
     use super::*;
     #[test]
@@ -234,6 +223,9 @@ mod tests {
             std::fs::read_to_string(dir.path().join("[icon=selector-combinator].json")).unwrap();
         let written_json = serde_json::Value::from_str(&written_json).unwrap();
         assert_eq!(written_json, json);
+
+        let loaded_json = crate::load::load(&dir.path().join("[icon=selector-combinator].json"));
+        assert_eq!(loaded_json, json)
     }
 
     #[test]
@@ -250,7 +242,8 @@ mod tests {
         let subsubfiles = read_dir_unwrap(&dir.path().join("Untitled/1 Nested Book"));
         assert_eq!(subsubfiles, ["6 [icon=bulk-inserter].json", "book.json"]);
 
-        // TODO: when load is implemented, test that it can load everything back properly.
+        let loaded_json = crate::load::load(&dir.path().join("Untitled"));
+        assert_eq!(loaded_json, json)
     }
 
     #[test]
diff --git a/src/test_util.rs b/src/test_util.rs
new file mode 100644
index 0000000..ef450b4
--- /dev/null
+++ b/src/test_util.rs
@@ -0,0 +1,14 @@
+use std::{ffi::OsString, fs::read_dir, path::Path};
+
+#[track_caller]
+pub(crate) fn read_dir_unwrap(path: &Path) -> Vec<OsString> {
+    let mut result = read_dir(path)
+        .unwrap_or_else(|e| panic!("error reading directory {path:?}: {e}"))
+        .map(|f| {
+            f.unwrap_or_else(|e| panic!("error while reading directory {path:?}: {e}"))
+                .file_name()
+        })
+        .collect::<Vec<_>>();
+    result.sort();
+    result
+}

From 959a8746b595d1b7158ba4628f570f2e55666334 Mon Sep 17 00:00:00 2001
From: Dan Johnson <ComputerDruid@gmail.com>
Date: Fri, 29 Aug 2025 20:53:26 -0700
Subject: [PATCH 2/2] implement load --stamp

---
 Cargo.lock       | 1199 ++++++++++++++++++++++++++++++++++++++++++++--
 Cargo.toml       |    1 +
 src/blueprint.rs |   95 ++++
 src/load.rs      |   17 +
 src/main.rs      |    4 +-
 5 files changed, 1286 insertions(+), 30 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 792bb2a..7c059a0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -82,6 +82,12 @@ dependencies = [
  "windows-sys 0.60.2",
 ]
 
+[[package]]
+name = "arc-swap"
+version = "1.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69f7f8c3906b62b754cd5326047894316021dcfe5a194c8ea52bdd94934a3457"
+
 [[package]]
 name = "autocfg"
 version = "1.5.0"
@@ -100,12 +106,38 @@ version = "2.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34efbcccd345379ca2868b2b2c9d3782e9cc58ba87bc7d79d5b53d9c9ae6f25d"
 
+[[package]]
+name = "block-buffer"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "bstr"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "234113d19d0d7d613b40e86fb654acf958910802bcceab913a4f9e7cda03b1a4"
+dependencies = [
+ "memchr",
+ "regex-automata",
+ "serde",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
 
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "cc"
 version = "1.2.34"
@@ -173,6 +205,12 @@ version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b94f61472cee1439c0b966b47e3aca9ae07e45d070759512cd390ea2bebc6675"
 
+[[package]]
+name = "clru"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cbd0f76e066e64fdc5631e3bb46381254deab9ef1158292f27c8c57e3bf3fe59"
+
 [[package]]
 name = "colorchoice"
 version = "1.0.4"
@@ -194,6 +232,15 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "cpufeatures"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59ed5838eebb26a2bb2e58f6d5b5316989ae9d08bab10e0e6d103e656d1b0280"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.5.0"
@@ -231,6 +278,16 @@ dependencies = [
  "winapi",
 ]
 
+[[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 = "derive_more"
 version = "2.0.1"
@@ -252,6 +309,27 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "digest"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+]
+
+[[package]]
+name = "displaydoc"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97369cbbc041bc366949bc74d34658d6cda5621039731c6310521892a3a20ae0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "document-features"
 version = "0.2.11"
@@ -261,6 +339,12 @@ dependencies = [
  "litrs",
 ]
 
+[[package]]
+name = "dunce"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "92773504d58c093f6de2459af4af33faa518c13451eb8f2b5698ed3d36e7c813"
+
 [[package]]
 name = "dyn-clone"
 version = "1.0.20"
@@ -297,6 +381,7 @@ dependencies = [
  "clap",
  "crossterm",
  "flate2",
+ "gix",
  "itertools",
  "jaq-core",
  "jaq-json",
@@ -308,6 +393,16 @@ dependencies = [
  "zlib-rs",
 ]
 
+[[package]]
+name = "faster-hex"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7223ae2d2f179b803433d9c830478527e92b8117eab39460edae7f1614d9fb73"
+dependencies = [
+ "heapless",
+ "serde",
+]
+
 [[package]]
 name = "fastrand"
 version = "2.3.0"
@@ -331,58 +426,745 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
 
+[[package]]
+name = "form_urlencoded"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb4cb245038516f5f85277875cdaa4f7d2c9a0fa0468de06ed190163b1581fcf"
+dependencies = [
+ "percent-encoding",
+]
+
+[[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 = "getrandom"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26145e563e54f2cadc477553f1ec5ee650b00862f0a58bcd12cbdc5f0ea2d2f4"
+checksum = "26145e563e54f2cadc477553f1ec5ee650b00862f0a58bcd12cbdc5f0ea2d2f4"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi",
+ "wasi 0.14.3+wasi-0.2.4",
+]
+
+[[package]]
+name = "gix"
+version = "0.73.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "514c29cc879bdc0286b0cbc205585a49b252809eb86c69df4ce4f855ee75f635"
+dependencies = [
+ "gix-actor",
+ "gix-commitgraph",
+ "gix-config",
+ "gix-date",
+ "gix-diff",
+ "gix-discover",
+ "gix-features",
+ "gix-fs",
+ "gix-glob",
+ "gix-hash",
+ "gix-hashtable",
+ "gix-lock",
+ "gix-object",
+ "gix-odb",
+ "gix-pack",
+ "gix-path",
+ "gix-protocol",
+ "gix-ref",
+ "gix-refspec",
+ "gix-revision",
+ "gix-revwalk",
+ "gix-sec",
+ "gix-shallow",
+ "gix-tempfile",
+ "gix-trace",
+ "gix-traverse",
+ "gix-url",
+ "gix-utils",
+ "gix-validate",
+ "once_cell",
+ "smallvec",
+ "thiserror",
+]
+
+[[package]]
+name = "gix-actor"
+version = "0.35.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d36dcf9efe32b51b12dfa33cedff8414926124e760a32f9e7a6b5580d280967"
+dependencies = [
+ "bstr",
+ "gix-date",
+ "gix-utils",
+ "itoa",
+ "thiserror",
+ "winnow",
+]
+
+[[package]]
+name = "gix-chunk"
+version = "0.4.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b1f1d8764958699dc764e3f727cef280ff4d1bd92c107bbf8acd85b30c1bd6f"
+dependencies = [
+ "thiserror",
+]
+
+[[package]]
+name = "gix-command"
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@@ -457,6 +1239,47 @@ dependencies = [
  "urlencoding",
 ]
 
+[[package]]
+name = "jiff"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be1f93b8b1eb69c77f24bbb0afdf66f54b632ee39af40ca21c4365a1d7347e49"
+dependencies = [
+ "jiff-static",
+ "jiff-tzdb-platform",
+ "log",
+ "portable-atomic",
+ "portable-atomic-util",
+ "serde",
+ "windows-sys 0.59.0",
+]
+
+[[package]]
+name = "jiff-static"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03343451ff899767262ec32146f6d559dd759fdadf42ff0e227c7c48f72594b4"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "jiff-tzdb"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1283705eb0a21404d2bfd6eef2a7593d240bc42a0bdb39db0ad6fa2ec026524"
+
+[[package]]
+name = "jiff-tzdb-platform"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "875a5a69ac2bab1a891711cf5eccbec1ce0341ea805560dcd90b7a2e925132e8"
+dependencies = [
+ "jiff-tzdb",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.77"
@@ -494,6 +1317,12 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cd945864f07fe9f5371a27ad7b52a172b4b499999f1d97574c9fa68373937e12"
 
+[[package]]
+name = "litemap"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "241eaef5fd12c88705a01fc1066c48c4b36e0dd4377dcdc7ec3942cea7a69956"
+
 [[package]]
 name = "litrs"
 version = "0.4.2"
@@ -516,12 +1345,32 @@ version = "0.4.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
 
+[[package]]
+name = "maybe-async"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5cf92c10c7e361d6b99666ec1c6f9805b0bea2c3bd8c78dc6fe98ac5bd78db11"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32a282da65faaf38286cf3be983213fcf1d2e2a58700e808f83f4ea9a4804bc0"
 
+[[package]]
+name = "memmap2"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "843a98750cd611cc2965a8213b53b43e715f13c37a9e096c6408e69990961db7"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.8.9"
@@ -587,6 +1436,36 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
+[[package]]
+name = "percent-encoding"
+version = "2.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
+
+[[package]]
+name = "portable-atomic"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f84267b20a16ea918e43c6a88433c2d54fa145c92a811b5b047ccbe153674483"
+
+[[package]]
+name = "portable-atomic-util"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8a2f0d8d040d7848a709caf78912debcc3f33ee4b3cac47d73d1e1069e83507"
+dependencies = [
+ "portable-atomic",
+]
+
+[[package]]
+name = "potential_utf"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84df19adbe5b5a0782edcab45899906947ab039ccf4573713735ee7de1e6b08a"
+dependencies = [
+ "zerovec",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.101"
@@ -596,6 +1475,15 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "prodash"
+version = "30.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a6efc566849d3d9d737c5cb06cc50e48950ebe3d3f9d70631490fff3a07b139"
+dependencies = [
+ "parking_lot",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.40"
@@ -680,6 +1568,15 @@ version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
 
+[[package]]
+name = "same-file"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "sanitize-filename"
 version = "0.6.0"
@@ -727,6 +1624,33 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
+[[package]]
+name = "sha1-checked"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89f599ac0c323ebb1c6082821a54962b839832b03984598375bff3975b804423"
+dependencies = [
+ "digest",
+ "sha1",
+]
+
+[[package]]
+name = "shell-words"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24188a676b6ae68c3b2cb3a01be17fbf7240ce009799bb56d5b1409051e78fde"
+
 [[package]]
 name = "shlex"
 version = "1.3.0"
@@ -769,6 +1693,12 @@ version = "1.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
 
+[[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"
@@ -786,6 +1716,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "synstructure"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.21.0"
@@ -799,36 +1740,136 @@ dependencies = [
  "windows-sys 0.60.2",
 ]
 
+[[package]]
+name = "thiserror"
+version = "2.0.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3467d614147380f2e4e374161426ff399c91084acd2363eaf549172b3d5e60c0"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "2.0.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c5e1be1c48b9172ee610da68fd9cd2770e7a4056cb3fc98710ee6906f0c7960"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "tinystr"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d4f6d1145dcb577acf783d4e601bc1d76a13337bb54e6233add580b07344c8b"
+dependencies = [
+ "displaydoc",
+ "zerovec",
+]
+
+[[package]]
+name = "tinyvec"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa5fdc3bce6191a1dbc8c02d5c8bffcf557bafa17c124c5264a458f1b0613fa"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
+
 [[package]]
 name = "typed-arena"
 version = "2.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6af6ae20167a9ece4bcb41af5b80f8a1f1df981f6391189ce00fd257af04126a"
 
+[[package]]
+name = "typenum"
+version = "1.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1dccffe3ce07af9386bfd29e80c0ab1a8205a2fc34e4bcd40364df902cfa8f3f"
+
+[[package]]
+name = "unicode-bom"
+version = "2.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7eec5d1121208364f6793f7d2e222bf75a915c19557537745b195b253dd64217"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
 
+[[package]]
+name = "unicode-normalization"
+version = "0.1.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5033c97c4262335cded6d6fc3e5c18ab755e1a3dc96376350f3d8e9f009ad956"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f6ccf251212114b54433ec949fd6a7841275f9ada20dddd2f29e9ceea4501493"
 
+[[package]]
+name = "url"
+version = "2.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08bc136a29a3d1758e07a9cca267be308aeebf5cfd5a10f3f67ab2097683ef5b"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "percent-encoding",
+ "serde",
+]
+
 [[package]]
 name = "urlencoding"
 version = "2.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
 
+[[package]]
+name = "utf8_iter"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"
+
 [[package]]
 name = "utf8parse"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "version_check"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
+[[package]]
+name = "walkdir"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
+dependencies = [
+ "same-file",
+ "winapi-util",
+]
+
 [[package]]
 name = "wasi"
 version = "0.11.1+wasi-snapshot-preview1"
@@ -918,6 +1959,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0978bf7171b3d90bac376700cb56d606feb40f251a475a5d6634613564460b22"
+dependencies = [
+ "windows-sys 0.60.2",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
@@ -1130,12 +2180,105 @@ version = "0.53.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "271414315aff87387382ec3d271b52d7ae78726f5d44ac98b4f4030c91880486"
 
+[[package]]
+name = "winnow"
+version = "0.7.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21a0236b59786fed61e2a80582dd500fe61f18b5dca67a4a067d0bc9039339cf"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "wit-bindgen"
 version = "0.45.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "052283831dbae3d879dc7f51f3d92703a316ca49f91540417d38591826127814"
 
+[[package]]
+name = "writeable"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea2f10b9bb0928dfb1b42b65e1f9e36f7f54dbdf08457afefb38afcdec4fa2bb"
+
+[[package]]
+name = "yoke"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f41bb01b8226ef4bfd589436a297c53d118f65921786300e427be8d487695cc"
+dependencies = [
+ "serde",
+ "stable_deref_trait",
+ "yoke-derive",
+ "zerofrom",
+]
+
+[[package]]
+name = "yoke-derive"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38da3c9736e16c5d3c8c597a9aaa5d1fa565d0532ae05e27c24aa62fb32c0ab6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zerofrom"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50cc42e0333e05660c3587f3bf9d0478688e15d870fab3346451ce7f8c9fbea5"
+dependencies = [
+ "zerofrom-derive",
+]
+
+[[package]]
+name = "zerofrom-derive"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zerotrie"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36f0bbd478583f79edad978b407914f61b2972f5af6fa089686016be8f9af595"
+dependencies = [
+ "displaydoc",
+ "yoke",
+ "zerofrom",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7aa2bd55086f1ab526693ecbe444205da57e25f4489879da80635a46d90e73b"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b96237efa0c878c64bd89c436f661be4e46b2f3eff1ebb976f7ef2321d2f58f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "zlib-rs"
 version = "0.5.1"
diff --git a/Cargo.toml b/Cargo.toml
index c6127ff..2fd989c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,7 @@ base64 = "0.22.1"
 clap = { version = "4.5.42", features = ["derive"] }
 crossterm = { version = "0.29.0", features = ["osc52"] }
 flate2 = { version = "1.1.2", default-features = false, features = ["zlib-rs"] }
+gix = { version = "0.73.0", default-features = false }
 itertools = "0.14.0"
 sanitize-filename = "0.6.0"
 serde = { version = "1.0.219", features = ["derive"] }
diff --git a/src/blueprint.rs b/src/blueprint.rs
index e799662..b003ee5 100644
--- a/src/blueprint.rs
+++ b/src/blueprint.rs
@@ -2,8 +2,10 @@ pub(crate) mod count_entities;
 pub(crate) mod upgrade_quality;
 
 use std::{
+    borrow::Borrow,
     fmt::{Debug, Display},
     io::Read,
+    mem,
 };
 
 use base64::{Engine, prelude::BASE64_STANDARD};
@@ -43,6 +45,80 @@ pub fn json_to_blueprint(value: serde_json::Value) -> String {
     result
 }
 
+pub(crate) enum BlueprintType<T: Borrow<serde_json::Value>> {
+    Blueprint(T),
+    BlueprintBook(T),
+    UpgradePlanner(T),
+    DeconstructionPlanner(T),
+}
+
+impl BlueprintType<&mut serde_json::Value> {
+    pub fn new(json: &mut serde_json::Value) -> BlueprintType<&mut serde_json::Value> {
+        let json = match json {
+            serde_json::Value::Object(json) => json,
+            _ => panic!("blueprint entry should be an object, got {json:?}"),
+        };
+
+        if json.contains_key("blueprint") {
+            BlueprintType::Blueprint(&mut json["blueprint"])
+        } else if json.contains_key("blueprint_book") {
+            BlueprintType::BlueprintBook(&mut json["blueprint_book"])
+        } else if json.contains_key("upgrade_planner") {
+            BlueprintType::UpgradePlanner(&mut json["upgrade_planner"])
+        } else if json.contains_key("deconstruction_planner") {
+            BlueprintType::DeconstructionPlanner(&mut json["deconstruction_planner"])
+        } else {
+            panic!("blueprint has unknown type: {:?}", json.keys());
+        }
+    }
+
+    fn any_mut(&mut self) -> &mut serde_json::Value {
+        match self {
+            BlueprintType::Blueprint(value) => value,
+            BlueprintType::BlueprintBook(value) => value,
+            BlueprintType::UpgradePlanner(value) => value,
+            BlueprintType::DeconstructionPlanner(value) => value,
+        }
+    }
+
+    pub(crate) fn set_tag_in_description(&mut self, tag: &str, value: &str) {
+        let description = self
+            .any_mut()
+            .as_object_mut()
+            .expect("should be a json object")
+            .entry("description")
+            .or_insert_with(|| json!(""));
+        let serde_json::Value::String(description) = description else {
+            panic!("expected description to be a string")
+        };
+        *description = set_tag_in_string(mem::take(description), tag, value);
+    }
+}
+
+fn set_tag_in_string(description: String, tag: &str, value: &str) -> String {
+    let start_offset = if description.starts_with(&format!("{tag}:")) {
+        0
+    } else if let Some(index) = description.find(&format!("\n{tag}:")) {
+        index + "\n".len()
+    } else {
+        // couldn't find tag, add it to a new line at the end
+        let mut new_description = description;
+        if !new_description.is_empty() {
+            new_description.push('\n');
+        }
+        new_description.push_str(&format!("{tag}: {value}"));
+        return new_description;
+    };
+    let old_description = description;
+    let prefix = &old_description[..start_offset];
+    let suffix = if let Some(end_index) = &old_description[start_offset..].find("\n") {
+        &old_description[start_offset + end_index..]
+    } else {
+        ""
+    };
+    format!("{prefix}{tag}: {value}{suffix}")
+}
+
 pub fn make_constant_combinator_json(signals: Vec<((String, Quality), i64)>) -> serde_json::Value {
     const COMBINATOR: &str = "0eNqNkNEOgjAMRf+lz8MIEYH9ijFmw6pNRkdGMRKyf3fDF5+Mj23uPbe3K1g34xiIBfQK1HueQJ9WmOjOxuWdLCOCBhIcQAGbIU9ZJ4al6P1giY34AFEB8RVfoMt4VoAsJIQf3DYsF54HiyEJfoIUjH5KXs85P/GK+ljvagUL6OpY7uqUdKWA/UdyUJkiwbuLxYd5UkIk342cYPirjQTD0+iDFBad5CK9n/NHyu9KMbfajPrrawqeKWU7pGrLQ9NVTVt1zb7tYnwDHB11ag==";
     let json = blueprint_to_json(COMBINATOR);
@@ -119,3 +195,22 @@ impl Quality {
         })
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::blueprint::set_tag_in_string;
+
+    #[test]
+    fn test_set_tag() {
+        assert_eq!(
+            set_tag_in_string("foo bar".into(), "t", "val"),
+            "foo bar\nt: val"
+        );
+
+        // Empty string considered to be empty
+        assert_eq!(set_tag_in_string("".into(), "t", "val"), "t: val");
+
+        // Existing newlines are considered intentional
+        assert_eq!(set_tag_in_string("\n".into(), "t", "val"), "\n\nt: val");
+    }
+}
diff --git a/src/load.rs b/src/load.rs
index fe8ddef..58796a6 100644
--- a/src/load.rs
+++ b/src/load.rs
@@ -2,6 +2,8 @@ use std::{fs, path::Path};
 
 use itertools::Itertools;
 
+use crate::blueprint;
+
 fn load_file(path: &Path) -> serde_json::Value {
     serde_json::from_str(
         &fs::read_to_string(path)
@@ -94,6 +96,21 @@ pub fn load(path: &Path) -> serde_json::Value {
     book_json
 }
 
+pub(crate) fn stamp(json: &mut serde_json::Value, path: &Path) {
+    let dir = if path.is_dir() {
+        path
+    } else {
+        path.parent().unwrap_or(Path::new("."))
+    };
+    let repo =
+        gix::discover(dir).unwrap_or_else(|e| panic!("error: couldn't find git repository: {e}"));
+    let id = repo
+        .head_id()
+        .unwrap_or_else(|e| panic!("error: couldn't get HEAD commit: {e}"));
+    let mut bp = blueprint::BlueprintType::new(json);
+    bp.set_tag_in_description("last_commit", &format!("{id}"));
+}
+
 #[cfg(test)]
 mod tests {
     use std::str::FromStr as _;
diff --git a/src/main.rs b/src/main.rs
index 586eed8..0b337e0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -159,9 +159,9 @@ impl Commands {
                 to_clipboard,
                 stamp,
             } => {
-                let json = load::load(&file);
+                let mut json = load::load(&file);
                 if stamp {
-                    unimplemented!();
+                    load::stamp(&mut json, &file);
                 }
                 let bp = json_to_blueprint(json);
                 if to_clipboard {