From 3783b6ace86957c95e5137c7645af319dd2462e9 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Sun, 28 Mar 2021 17:13:27 +0300
Subject: feat: set version in Cargo.toml for Rust projects

---
 Cargo.lock                | 1625 ++++++++++++++++++++++++++++++++++++++++++---
 Cargo.toml                |    3 +
 bumper.md                 |   13 +-
 check                     |    2 +-
 src/bin/bumper.rs         |    5 +
 src/bin/toml.rs           |   20 +
 src/errors.rs             |   26 +
 src/lib.rs                |    2 +
 src/project.rs            |   26 +
 src/rust.rs               |   80 +++
 subplot/bumper.py         |   16 +
 subplot/bumper.yaml       |    6 +
 subplot/vendored/files.py |    2 +-
 13 files changed, 1733 insertions(+), 93 deletions(-)
 create mode 100644 src/bin/toml.rs
 create mode 100644 src/project.rs
 create mode 100644 src/rust.rs

diff --git a/Cargo.lock b/Cargo.lock
index 778f1fa..b419d4e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,20 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "addr2line"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a55f82cfe485775d02112886f4169bde0c5894d75e79ead7eafe7e40a25e45f7"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.15"
@@ -15,7 +30,7 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
 dependencies = [
- "winapi",
+ "winapi 0.3.9",
 ]
 
 [[package]]
@@ -24,6 +39,24 @@ version = "1.0.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81cddc5f91628367664cc7c69714ff08deee8a3efc54623011c772544d7b2767"
 
+[[package]]
+name = "arrayref"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544"
+
+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
+[[package]]
+name = "ascii"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eab1c04a571841102f5345a8fc0f6bb3d31c315dec879b5c6e42e40ce7ffa34e"
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -32,20 +65,64 @@ checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
 dependencies = [
  "hermit-abi",
  "libc",
- "winapi",
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "backtrace"
+version = "0.3.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d117600f438b1707d4e4ae15d3595657288f8235a0eb593e80ecc98ab34e1bc"
+dependencies = [
+ "addr2line",
+ "cfg-if 1.0.0",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
 ]
 
+[[package]]
+name = "base64"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
+
 [[package]]
 name = "bitflags"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
+[[package]]
+name = "blake2b_simd"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afa748e348ad3be8263be728124b24a24f268266f6f5d58af9d75f6a40b5c587"
+dependencies = [
+ "arrayref",
+ "arrayvec",
+ "constant_time_eq",
+]
+
+[[package]]
+name = "bumpalo"
+version = "3.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63396b8a4b9de3f4fdfb320ab6080762242f66a8ef174c49d8e19b674db4cdbe"
+
 [[package]]
 name = "bumper"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "cargo-edit",
  "log",
  "pandoc",
  "pandoc_ast",
@@ -54,14 +131,101 @@ dependencies = [
  "serde_json",
  "structopt",
  "thiserror",
+ "toml",
+ "toml_edit",
+]
+
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
+[[package]]
+name = "bytes"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
+
+[[package]]
+name = "bytes"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b700ce4376041dcd0a327fd0097c41095743c4c8af8887265942faf1100bd040"
+
+[[package]]
+name = "cargo-edit"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e134b2890bf9998402c781fe18798f3c82bc555dee24e8ba25e6cd0c40c7b0d"
+dependencies = [
+ "atty",
+ "cargo_metadata",
+ "dirs",
+ "env_proxy",
+ "error-chain",
+ "failure",
+ "git2",
+ "hex",
+ "regex",
+ "reqwest",
+ "semver 0.11.0",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "structopt",
+ "subprocess",
+ "termcolor",
+ "toml",
+ "toml_edit",
+ "url",
+]
+
+[[package]]
+name = "cargo_metadata"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3a567c24b86754d629addc2db89e340ac9398d07b5875efcff837e3878e17ec"
+dependencies = [
+ "semver 0.10.0",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "cc"
+version = "1.0.67"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3c69b077ad434294d3ce9f1f6143a2a4b89a8a2d54ef813d85003a4fd1137fd"
+dependencies = [
+ "jobserver",
 ]
 
+[[package]]
+name = "cfg-if"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "chrono"
+version = "0.4.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
+dependencies = [
+ "libc",
+ "num-integer",
+ "num-traits",
+ "time",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "clap"
 version = "2.33.3"
@@ -77,12 +241,87 @@ dependencies = [
  "vec_map",
 ]
 
+[[package]]
+name = "combine"
+version = "3.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da3da6baa321ec19e1cc41d31bf599f00c783d0517095cdaf0332e3fe8d20680"
+dependencies = [
+ "ascii",
+ "byteorder",
+ "either",
+ "memchr",
+ "unreachable",
+]
+
+[[package]]
+name = "constant_time_eq"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
+
+[[package]]
+name = "core-foundation"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0a89e2ae426ea83155dccf10c0fa6b1463ef6d5fcb44cee0b224a408fa640a62"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea221b5284a47e40033bf9b66f35f984ec0ea2931eb03505246cd27a963f981b"
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7e9d99fa91428effe99c5c6d4634cdeba32b8cf784fc428a2a687f61a952c49"
+dependencies = [
+ "autocfg",
+ "cfg-if 1.0.0",
+ "lazy_static",
+]
+
+[[package]]
+name = "dirs"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "142995ed02755914747cc6ca76fc7e4583cd18578746716d0508ea6ed558b9ff"
+dependencies = [
+ "dirs-sys",
+]
+
+[[package]]
+name = "dirs-sys"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e93d7f5705de3e49895a2b5e0b8855a1c27f080192ae9c32a6432d50741a57a"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "either"
 version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
+[[package]]
+name = "encoding_rs"
+version = "0.8.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80df024fbc5ac80f87dfef0d9f5209a252f2a497f7f42944cff24d8253cac065"
+dependencies = [
+ "cfg-if 1.0.0",
+]
+
 [[package]]
 name = "env_logger"
 version = "0.7.1"
@@ -97,180 +336,1002 @@ dependencies = [
 ]
 
 [[package]]
-name = "heck"
-version = "0.3.2"
+name = "env_proxy"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87cbf45460356b7deeb5e3415b5563308c0a9b057c85e12b06ad551f98d0a6ac"
+checksum = "3a5019be18538406a43b5419a5501461f0c8b49ea7dfda0cfc32f4e51fc44be1"
 dependencies = [
- "unicode-segmentation",
+ "log",
+ "url",
 ]
 
 [[package]]
-name = "hermit-abi"
-version = "0.1.18"
+name = "error-chain"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "322f4de77956e22ed0e5032c359a0f1273f1f7f0d79bfa3b8ffbc730d7fbcc5c"
+checksum = "2d2f06b9cac1506ece98fe3231e3cc9c4410ec3d5b1f24ae1c8946f0742cdefc"
 dependencies = [
- "libc",
+ "backtrace",
+ "version_check",
 ]
 
 [[package]]
-name = "humantime"
-version = "1.3.0"
+name = "failure"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df004cfca50ef23c36850aaaa59ad52cc70d0e90243c3c7737a4dd32dc7a3c4f"
+checksum = "d32e9bd16cc02eae7db7ef620b392808b89f6a5e16bb3497d159c6b92a0f4f86"
 dependencies = [
- "quick-error",
+ "backtrace",
+ "failure_derive",
 ]
 
 [[package]]
-name = "itertools"
-version = "0.8.2"
+name = "failure_derive"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f56a2d0bc861f9165be4eb3442afd3c236d8a98afd426f65d92324ae1091a484"
+checksum = "aa4da3c766cd7a0db8242e326e9e4e081edd567072893ed320008189715366a4"
 dependencies = [
- "either",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
 ]
 
 [[package]]
-name = "itoa"
-version = "0.4.7"
+name = "fnv"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd25036021b0de88a0aff6b850051563c6516d0bf53f8638938edbb9de732736"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
-name = "lazy_static"
-version = "1.4.0"
+name = "foreign-types"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
+dependencies = [
+ "foreign-types-shared",
+]
 
 [[package]]
-name = "libc"
-version = "0.2.91"
+name = "foreign-types-shared"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8916b1f6ca17130ec6568feccee27c156ad12037880833a3b842a823236502e7"
+checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
 
 [[package]]
-name = "log"
-version = "0.4.14"
+name = "form_urlencoded"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
+checksum = "5fc25a87fa4fd2094bffb06925852034d90a17f0d1e05197d4956d3555752191"
 dependencies = [
- "cfg-if",
+ "matches",
+ "percent-encoding",
 ]
 
 [[package]]
-name = "memchr"
-version = "2.3.4"
+name = "fuchsia-zircon"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
+checksum = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
+dependencies = [
+ "bitflags",
+ "fuchsia-zircon-sys",
+]
 
 [[package]]
-name = "pandoc"
-version = "0.8.4"
+name = "fuchsia-zircon-sys"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "84060e442eb742cdba4038302c9924aecd67434073b9785dd9a6cec8a3f4065a"
+checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
+
+[[package]]
+name = "futures-channel"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c2dd2df839b57db9ab69c2c9d8f3e8c81984781937fe2807dc6dcf3b2ad2939"
 dependencies = [
- "itertools",
+ "futures-core",
 ]
 
 [[package]]
-name = "pandoc_ast"
-version = "0.8.0"
+name = "futures-core"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a940e63c65b34a7be2f847de6847b4bc9b68d74e3f7a5c648ca2fa5317f3bd06"
+checksum = "15496a72fabf0e62bdc3df11a59a3787429221dd0710ba8ef163d6f7a9112c94"
+
+[[package]]
+name = "futures-io"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d71c2c65c57704c32f5241c1223167c2c3294fd34ac020c807ddbe6db287ba59"
+
+[[package]]
+name = "futures-sink"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85754d98985841b7d4f5e8e6fbfa4a4ac847916893ec511a2917ccd8525b8bb3"
+
+[[package]]
+name = "futures-task"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa189ef211c15ee602667a6fcfe1c1fd9e07d42250d2156382820fba33c9df80"
+
+[[package]]
+name = "futures-util"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1812c7ab8aedf8d6f2701a43e1243acdbcc2b36ab26e2ad421eb99ac963d96d1"
 dependencies = [
- "serde",
- "serde_derive",
- "serde_json",
+ "futures-core",
+ "futures-io",
+ "futures-task",
+ "memchr",
+ "pin-project-lite 0.2.6",
+ "pin-utils",
+ "slab",
 ]
 
 [[package]]
-name = "pretty_env_logger"
-version = "0.4.0"
+name = "getrandom"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "926d36b9553851b8b0005f1275891b392ee4d2d833852c417ed025477350fb9d"
+checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
 dependencies = [
- "env_logger",
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi 0.9.0+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9495705279e7140bf035dde1f6e750c162df8b625267cd52cc44e0b156732c8"
+dependencies = [
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi 0.10.2+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "gimli"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6503fe142514ca4799d4c26297c4248239fe8838d827db6bd6065c6ed29a6ce"
+
+[[package]]
+name = "git2"
+version = "0.13.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d250f5f82326884bd39c2853577e70a121775db76818ffa452ed1e80de12986"
+dependencies = [
+ "bitflags",
+ "libc",
+ "libgit2-sys",
  "log",
+ "openssl-probe",
+ "openssl-sys",
+ "url",
 ]
 
 [[package]]
-name = "proc-macro-error"
-version = "1.0.4"
+name = "h2"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+checksum = "5e4728fd124914ad25e99e3d15a9361a879f6620f63cb56bbb08f95abb97a535"
 dependencies = [
- "proc-macro-error-attr",
- "proc-macro2",
- "quote",
- "syn",
- "version_check",
+ "bytes 0.5.6",
+ "fnv",
+ "futures-core",
+ "futures-sink",
+ "futures-util",
+ "http",
+ "indexmap",
+ "slab",
+ "tokio",
+ "tokio-util",
+ "tracing",
+ "tracing-futures",
 ]
 
 [[package]]
-name = "proc-macro-error-attr"
-version = "1.0.4"
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+
+[[package]]
+name = "winapi"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -413,6 +1841,12 @@ dependencies = [
  "winapi-x86_64-pc-windows-gnu",
 ]
 
+[[package]]
+name = "winapi-build"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+
 [[package]]
 name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
@@ -425,7 +1859,7 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
 dependencies = [
- "winapi",
+ "winapi 0.3.9",
 ]
 
 [[package]]
@@ -433,3 +1867,22 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "winreg"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0120db82e8a1e0b9fb3345a539c478767c0048d842860994d96113d5b667bd69"
+dependencies = [
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "ws2_32-sys"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+dependencies = [
+ "winapi 0.2.8",
+ "winapi-build",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 93a77d7..6a31eb0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,7 @@ edition = "2018"
 
 [dependencies]
 anyhow = "1"
+cargo-edit = "0.7"
 log = "0.4"
 pandoc = "0.8.4"
 pandoc_ast = "0.8.0"
@@ -16,3 +17,5 @@ serde = "1.0.124"
 serde_json = "1.0.64"
 structopt = "0.3"
 thiserror = "1"
+toml = "0.5.8"
+toml_edit = "0.2.0"
diff --git a/bumper.md b/bumper.md
index a1bb929..b4a269f 100644
--- a/bumper.md
+++ b/bumper.md
@@ -71,16 +71,18 @@ doesn't find any files it knows about.
 
 ~~~scenario
 given an installed Bumper
-given file random.txt
-when I try to run bumper 1.2.3
+given file foo/random.txt from Cargo.toml
+given all files in foo are committed to git
+when I try to run, in foo, bumper 1.2
 then command fails
-then only files random.txt exist
+then only files random.txt, and .git exist in foo
 ~~~
 
 ~~~{#random.txt .file}
 Some random text file Bumper knows nothing about.
 ~~~
 
+
 ## Creates a release tag
 
 This scenario verifies that Bumper creates a git tag to mark a
@@ -92,8 +94,9 @@ given an installed Bumper
 given file foo/Cargo.toml from Cargo.toml
 given all files in foo are committed to git
 given the HEAD commit in foo is COMMIT
-when I run, in foo, bumper 1.2
-then in foo, git tag v1.2 is a signed tag pointing at <COMMIT>
+when I run, in foo, bumper 1.2.0
+then in foo, git tag v1.2.0 is a signed tag pointing at <COMMIT>
+then file foo/Cargo.toml matches regex /version\s*=\s*"1\.2\.0"/
 ~~~
 
 ~~~{#Cargo.toml .file .ini}
diff --git a/check b/check
index 3c68bdc..c82d8b6 100755
--- a/check
+++ b/check
@@ -17,7 +17,7 @@ fi
 
 got_cargo_cmd()
 {
-    cargo --list | grep " $1 " > /dev/null
+    cargo "$1" --help > /dev/null
 }
 
 got_cargo_cmd clippy && cargo clippy -q
diff --git a/src/bin/bumper.rs b/src/bin/bumper.rs
index 1a2e567..564b589 100644
--- a/src/bin/bumper.rs
+++ b/src/bin/bumper.rs
@@ -1,5 +1,6 @@
 use bumper::errors::BumperError;
 use bumper::git;
+use bumper::project::ProjectKind;
 use log::{error, info};
 use std::process::exit;
 use structopt::StructOpt;
@@ -15,6 +16,10 @@ fn bumper() -> Result<(), BumperError> {
     pretty_env_logger::init_custom_env("BUMPER_LOG");
     info!("Bumper starts");
     let opt = Opt::from_args();
+
+    let mut project = ProjectKind::detect(".")?;
+    project.set_version(&opt.version)?;
+
     git::tag(&opt.version)?;
     info!("Bumper ends OK");
     Ok(())
diff --git a/src/bin/toml.rs b/src/bin/toml.rs
new file mode 100644
index 0000000..f796057
--- /dev/null
+++ b/src/bin/toml.rs
@@ -0,0 +1,20 @@
+use cargo_edit::Manifest;
+use toml_edit::{Item, Value};
+
+fn main() {
+    let mut m = Manifest::open(&None).unwrap();
+    let package = m
+        .get_table(&[String::from("package")])
+        .unwrap()
+        .as_table_mut()
+        .unwrap();
+    // println!("package: {:?}", package);
+
+    let version = package.entry("version");
+    *version = Item::Value(Value::from("1.2"));
+    println!("version: {:?}", version);
+
+    let mut f = Manifest::find_file(&None).unwrap();
+    println!("file: {:?}", f);
+    m.write_to_file(&mut f).unwrap();
+}
diff --git a/src/errors.rs b/src/errors.rs
index 607eecb..282b5c5 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -1,5 +1,31 @@
+use std::path::PathBuf;
+
 #[derive(Debug, thiserror::Error)]
 pub enum BumperError {
+    #[error("Can't figure out what kind of project: {0}")]
+    UnknownProjectKind(PathBuf),
+
+    #[error("Couldn't read file {0}: {1}")]
+    Read(PathBuf, #[source] std::io::Error),
+
+    #[error("Couldn't write file {0}: {1}")]
+    Write(PathBuf, #[source] std::io::Error),
+
+    #[error("Couldn't find Cargo.toml in {0}: {1}")]
+    CargoTomlNotFound(PathBuf, #[source] cargo_edit::Error),
+
+    #[error("Couldn't parse Cargo.toml from {0}: {1}")]
+    FromToml(PathBuf, #[source] cargo_edit::Error),
+
+    #[error("Couldn't create Cargo.toml manifest to {0}: {1}")]
+    WriteToml(PathBuf, #[source] cargo_edit::Error),
+
+    #[error("Cargo.toml doesn't have a 'package' table")]
+    NoPackage(#[source] cargo_edit::Error),
+
+    #[error("'project' in Cargo.toml is not a table")]
+    ProjectNotTable,
+
     #[error("Failed to run git: {0}")]
     GitInvoke(#[source] std::io::Error),
 
diff --git a/src/lib.rs b/src/lib.rs
index 7d4548a..06071a6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,2 +1,4 @@
 pub mod errors;
 pub mod git;
+pub mod project;
+pub mod rust;
diff --git a/src/project.rs b/src/project.rs
new file mode 100644
index 0000000..7471c66
--- /dev/null
+++ b/src/project.rs
@@ -0,0 +1,26 @@
+use crate::errors::BumperError;
+use crate::rust::Rust;
+use std::path::Path;
+
+pub enum ProjectKind {
+    Rust(Rust),
+}
+
+impl ProjectKind {
+    pub fn detect<P: AsRef<Path>>(dirname: P) -> Result<ProjectKind, BumperError> {
+        let dirname = dirname.as_ref();
+
+        if let Ok(p) = Rust::new(dirname) {
+            return Ok(Self::Rust(p));
+        }
+
+        Err(BumperError::UnknownProjectKind(dirname.to_path_buf()))
+    }
+
+    pub fn set_version(&mut self, version: &str) -> Result<(), BumperError> {
+        match self {
+            Self::Rust(ref mut rust) => rust.set_version(version)?,
+        }
+        Ok(())
+    }
+}
diff --git a/src/rust.rs b/src/rust.rs
new file mode 100644
index 0000000..192c387
--- /dev/null
+++ b/src/rust.rs
@@ -0,0 +1,80 @@
+use crate::errors::BumperError;
+use cargo_edit::Manifest;
+use log::{debug, info};
+use std::path::{Path, PathBuf};
+use toml_edit::{Item, Value};
+
+pub struct Rust {
+    dirname: PathBuf,
+    cargo_toml: CargoToml,
+}
+
+impl Rust {
+    pub fn new(dirname: &Path) -> Result<Self, BumperError> {
+        let cargo_toml = dirname.join("Cargo.toml");
+        if cargo_toml.exists() {
+            return Ok(Self {
+                dirname: dirname.to_path_buf(),
+                cargo_toml: CargoToml::parse(&cargo_toml)?,
+            });
+        }
+        Err(BumperError::UnknownProjectKind(dirname.to_path_buf()))
+    }
+
+    pub fn set_version(&mut self, version: &str) -> Result<(), BumperError> {
+        debug!("parsing Cargo.toml from {}", self.dirname.display());
+        // debug!("Cargo.toml:\n{:#?}", self.cargo_toml);
+        self.cargo_toml.set_version(version)?;
+        self.cargo_toml.write()?;
+
+        info!(
+            "Rust project {}, in {}, version set to {}",
+            self.dirname.display(),
+            "xxx",
+            version
+        );
+        Ok(())
+    }
+}
+
+#[derive(Debug)]
+struct CargoToml {
+    dirname: PathBuf,
+    manifest: Manifest,
+}
+
+impl CargoToml {
+    fn parse(dirname: &Path) -> Result<Self, BumperError> {
+        let manifest = Manifest::open(&Some(dirname.to_path_buf()))
+            .map_err(|err| BumperError::FromToml(dirname.to_path_buf(), err))?;
+        Ok(Self {
+            dirname: dirname.to_path_buf(),
+            manifest,
+        })
+    }
+
+    fn write(&self) -> Result<(), BumperError> {
+        debug!("saving Cargo.toml to {}", self.dirname.display());
+        let mut file = Manifest::find_file(&Some(self.dirname.to_path_buf()))
+            .map_err(|err| BumperError::CargoTomlNotFound(self.dirname.to_path_buf(), err))?;
+        self.manifest
+            .write_to_file(&mut file)
+            .map_err(|err| BumperError::WriteToml(self.dirname.to_path_buf(), err))?;
+        Ok(())
+    }
+
+    fn set_version(&mut self, version: &str) -> Result<(), BumperError> {
+        let package = self
+            .manifest
+            .get_table(&["package".to_string()])
+            .map_err(BumperError::NoPackage)?;
+        if let Some(package) = package.as_table_mut() {
+            debug!("setting Cargo.toml set version to {} in memory", version);
+            let v = package.entry("version");
+            *v = Item::Value(Value::from(version));
+        } else {
+            return Err(BumperError::ProjectNotTable);
+        }
+        Ok(())
+    }
+}
diff --git a/subplot/bumper.py b/subplot/bumper.py
index 0e6a0ef..3198e13 100644
--- a/subplot/bumper.py
+++ b/subplot/bumper.py
@@ -34,6 +34,22 @@ def run_command_in_directory(ctx, dirname=None, argv0=None, args=None):
     runcmd_exit_code_is_zero(ctx)
 
 
+def try_to_run_command_in_directory(ctx, dirname=None, argv0=None, args=None):
+    runcmd_run = globals()["runcmd_run"]
+
+    argv = [shlex.quote(argv0)] + shlex.split(args)
+    runcmd_run(ctx, argv, cwd=dirname)
+
+
+def only_these_files_exist_in(ctx, filenames=None, dirname=None):
+    assert_eq = globals()["assert_eq"]
+    expect = list(sorted(x for x in filenames.replace(",", "").split() if x != "and"))
+    actual = list(sorted(os.listdir(dirname)))
+    logging.debug(f"expect files; {expect}")
+    logging.debug(f"actual files; {actual}")
+    assert_eq(expect, actual)
+
+
 def git_tag_points_at(ctx, dirname=None, tag=None, varname=None):
     runcmd_run = globals()["runcmd_run"]
     runcmd_get_stdout = globals()["runcmd_get_stdout"]
diff --git a/subplot/bumper.yaml b/subplot/bumper.yaml
index 7b95dac..d1ee4f0 100644
--- a/subplot/bumper.yaml
+++ b/subplot/bumper.yaml
@@ -9,6 +9,12 @@
   
 - when: "I run, in {dirname}, {argv0}{args:text}"
   function: run_command_in_directory
+  
+- when: "I try to run, in {dirname}, {argv0}{args:text}"
+  function: try_to_run_command_in_directory
+
+- then: "only files {filenames:text} exist in {dirname}"
+  function: only_these_files_exist_in
 
 - then: "in {dirname}, git tag {tag} is a signed tag pointing at <{varname}>"
   function: git_tag_points_at
diff --git a/subplot/vendored/files.py b/subplot/vendored/files.py
index dd5b9f8..d3b96fc 100644
--- a/subplot/vendored/files.py
+++ b/subplot/vendored/files.py
@@ -92,7 +92,7 @@ def files_file_matches_regex(ctx, filename=None, regex=None):
         logging.debug(f"files_file_matches_regex: no match")
         logging.debug(f"  filenamed: {filename}")
         logging.debug(f"  regex: {regex}")
-        logging.debug(f"  content: {regex}")
+        logging.debug(f"  content: {content}")
         logging.debug(f"  match: {m}")
     assert_eq(bool(m), True)
 
-- 
cgit v1.2.1