Add assert_only_contains_regex!

This macro compliments the existing `assert_contains_regex!`. While
`assert_contains_regex!` implements the “exists” quantifier, the new
macro implements a “for all” quantifier.

In more details, the macro uses two steps:

1. Replace `{version}` in the `template` by a regular expression which
   will match _any_ SemVer version number. This allows, say,
   `docs.rs/{name}/{version}/` to match old and outdated occurrences
   of your package.

2. Find all matches in the file and check each match against
   `template`. This time we replace `{version}` with `pkg_version` so
   that we can do an accurate comparison with the actual package
   version.

This allows you to ensure that, say, all `docs.rs` links are updated.

Fixes #72.

.github/workflows/prepare-release.yml

@@ -94,7 +94,7 @@ jobs:
         run: |
           git commit --all -m "Update changelog for version ${{ needs.setup.outputs.new-version }}"
 
-      - name: Update TOML code blocks
+      - name: Update README version numbers
         run: |
           import fileinput, re, sys
 
@@ -103,6 +103,8 @@ jobs:
           MAJOR_MINOR = '.'.join(NEW_VERSION.split('.')[:2])
 
           for line in fileinput.input(inplace=True):
+              line = re.sub(f'https://docs.rs/{NAME}/[^/]+/',
+                            f'https://docs.rs/{NAME}/{NEW_VERSION}/', line)
               line = re.sub(f'{NAME} = "[^"]+"',
                             f'{NAME} = "{MAJOR_MINOR}"', line)
               line = re.sub(f'{NAME} = {{ version = "[^"]+"',

Cargo.toml

@@ -15,7 +15,7 @@ edition = "2018"
 default = ["markdown_deps_updated", "html_root_url_updated", "contains_regex"]
 markdown_deps_updated = ["pulldown-cmark", "semver", "toml"]
 html_root_url_updated = ["url", "semver", "syn", "proc-macro2"]
-contains_regex = ["regex"]
+contains_regex = ["regex", "semver"]
 
 [dependencies]
 pulldown-cmark = { version = "0.8", default-features = false, optional = true }

README.md

@@ -262,7 +262,7 @@ Contributions will be accepted under the same license.
 [build-status]: https://github.com/mgeisler/version-sync/actions?query=workflow%3Abuild+branch%3Amaster
 [codecov]: https://codecov.io/gh/mgeisler/version-sync
 [crates-io]: https://crates.io/crates/version-sync
-[api-docs]: https://docs.rs/version-sync/
+[api-docs]: https://docs.rs/version-sync/0.9.3/
 [rust-2018]: https://doc.rust-lang.org/edition-guide/rust-2018/
 [mit]: LICENSE
 [issue-17]: https://github.com/mgeisler/version-sync/issues/17

src/contains_regex.rs

@@ -1,11 +1,28 @@
 #![cfg(feature = "contains_regex")]
-use regex::{escape, RegexBuilder};
+use regex::{escape, Regex, RegexBuilder};
+use semver::{Version, VersionReq};
 
-use crate::helpers::{read_file, Result};
+use crate::helpers::{read_file, version_matches_request, Result};
+
+/// Matches a full or partial SemVer version number.
+const SEMVER_RE: &str = concat!(
+    r"(?P<major>0|[1-9]\d*)",
+    r"(?:\.(?P<minor>0|[1-9]\d*)",
+    r"(?:\.(?P<patch>0|[1-9]\d*)",
+    r"(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)",
+    r"(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?",
+    r"(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?",
+    r")?", // Close patch plus prerelease and buildmetadata.
+    r")?", // Close minor.
+);
 
 /// Check that `path` contain the regular expression given by
 /// `template`.
 ///
+/// This function only checks that there is at least one match for the
+/// `template` given. Use [`check_only_contains_regex`] if you want to
+/// ensure that all references to your package version is up to date.
+///
 /// The placeholders `{name}` and `{version}` will be replaced with
 /// `pkg_name` and `pkg_version`, if they are present in `template`.
 /// It is okay if `template` do not contain these placeholders.
@@ -47,6 +64,104 @@ pub fn check_contains_regex(
     }
 }
 
+/// Check that `path` only contains matches to the regular expression
+/// given by `template`.
+///
+/// While the [`check_contains_regex`] function verifies the existance
+/// of _at least one match_, this function verifies that _all matches_
+/// use the correct version number. Use this if you have a file which
+/// should always reference the current version of your package.
+///
+/// The check proceeds in two steps:
+///
+/// 1. Replace `{version}` in `template` by a regular expression which
+///    will match _any_ SemVer version number. This allows, say,
+///    `"docs.rs/{name}/{version}/"` to match old and outdated
+///    occurrences of your package.
+///
+/// 2. Find all matches in the file and check the version number in
+///    each match for compatibility with `pkg_version`. It is enough
+///    for the version number to be compatible, meaning that
+///    `"foo/{version}/bar" matches `"foo/1.2/bar"` when `pkg_version`
+///    is `"1.2.3"`.
+///
+/// It is an error if there are no matches for `template` at all.
+///
+/// The matching is done in multi-line mode, which means that `^` in
+/// the regular expression will match the beginning of any line in the
+/// file, not just the very beginning of the file.
+///
+/// # Errors
+///
+/// If any of the matches are incompatible with `pkg_version`, an
+/// `Err` is returned with a succinct error message. Status
+/// information has then already been printed on `stdout`.
+pub fn check_only_contains_regex(
+    path: &str,
+    template: &str,
+    pkg_name: &str,
+    pkg_version: &str,
+) -> Result<()> {
+    let version = Version::parse(pkg_version)
+        .map_err(|err| format!("bad package version {:?}: {}", pkg_version, err))?;
+
+    let pattern = template
+        .replace("{name}", &escape(pkg_name))
+        .replace("{version}", SEMVER_RE);
+    let re = RegexBuilder::new(&pattern)
+        .multi_line(true)
+        .build()
+        .map_err(|err| format!("could not parse template: {}", err))?;
+
+    let semver_re = Regex::new(&SEMVER_RE).unwrap();
+
+    let text = read_file(path).map_err(|err| format!("could not read {}: {}", path, err))?;
+
+    println!("Searching for \"{}\" in {}...", template, path);
+    let mut errors = 0;
+    let mut has_match = false;
+
+    for m in re.find_iter(&text) {
+        has_match = true;
+        let line_no = text[..m.start()].lines().count() + 1;
+
+        for semver in semver_re.find_iter(m.as_str()) {
+            let semver_request = VersionReq::parse(semver.as_str())
+                .map_err(|err| format!("could not parse version: {}", err))?;
+            let result = version_matches_request(&version, &semver_request);
+            match result {
+                Err(err) => {
+                    errors += 1;
+                    println!(
+                        "{} (line {}) ... found \"{}\", which does not match version \"{}\": {}",
+                        path,
+                        line_no,
+                        semver.as_str(),
+                        pkg_version,
+                        err
+                    );
+                }
+                Ok(()) => {
+                    println!("{} (line {}) ... ok", path, line_no);
+                }
+            }
+        }
+    }
+
+    if !has_match {
+        return Err(format!(
+            "{} ... found no matches for \"{}\"",
+            path, template
+        ));
+    }
+
+    if errors > 0 {
+        return Err(format!("{} ... found {} errors", path, errors));
+    }
+
+    return Ok(());
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -115,13 +230,110 @@ mod tests {
         use std::io::Write;
         let mut file = tempfile::NamedTempFile::new().unwrap();
 
-        println!("Path: {}", file.path().to_str().unwrap());
-
         file.write_all(b"first line\r\nsecond line\r\nthird line\r\n")
             .unwrap();
         assert_eq!(
             check_contains_regex(file.path().to_str().unwrap(), "^second line$", "", ""),
             Ok(())
         )
     }
+
+    #[test]
+    fn semver_regex() {
+        // We anchor the regex here to better match the behavior when
+        // users call check_only_contains_regex with a string like
+        // "foo {version}" which also contains more than just
+        // "{version}".
+        let re = Regex::new(&format!("^{}$", SEMVER_RE)).unwrap();
+        assert!(re.is_match("1.2.3"));
+        assert!(re.is_match("1.2"));
+        assert!(re.is_match("1"));
+        assert!(re.is_match("1.2.3-foo.bar.baz.42+build123.2021.12.11"));
+        assert!(!re.is_match("01"));
+        assert!(!re.is_match("01.02.03"));
+    }
+
+    #[test]
+    fn only_contains_success() {
+        use std::io::Write;
+        let mut file = tempfile::NamedTempFile::new().unwrap();
+        file.write_all(
+            b"first:  docs.rs/foo/1.2.3/foo/fn.bar.html
+              second: docs.rs/foo/1.2.3/foo/fn.baz.html",
+        )
+        .unwrap();
+
+        assert_eq!(
+            check_only_contains_regex(
+                file.path().to_str().unwrap(),
+                "docs.rs/{name}/{version}/{name}/",
+                "foo",
+                "1.2.3"
+            ),
+            Ok(())
+        )
+    }
+
+    #[test]
+    fn only_contains_success_compatible() {
+        use std::io::Write;
+        let mut file = tempfile::NamedTempFile::new().unwrap();
+        file.write_all(
+            b"first:  docs.rs/foo/1.2/foo/fn.bar.html
+              second: docs.rs/foo/1/foo/fn.baz.html",
+        )
+        .unwrap();
+
+        assert_eq!(
+            check_only_contains_regex(
+                file.path().to_str().unwrap(),
+                "docs.rs/{name}/{version}/{name}/",
+                "foo",
+                "1.2.3"
+            ),
+            Ok(())
+        )
+    }
+
+    #[test]
+    fn only_contains_failure() {
+        use std::io::Write;
+        let mut file = tempfile::NamedTempFile::new().unwrap();
+        file.write_all(
+            b"first:  docs.rs/foo/1.0.0/foo/ <- error
+              second: docs.rs/foo/2.0.0/foo/ <- ok
+              third:  docs.rs/foo/3.0.0/foo/ <- error",
+        )
+        .unwrap();
+
+        assert_eq!(
+            check_only_contains_regex(
+                file.path().to_str().unwrap(),
+                "docs.rs/{name}/{version}/{name}/",
+                "foo",
+                "2.0.0"
+            ),
+            Err(format!("{} ... found 2 errors", file.path().display()))
+        )
+    }
+
+    #[test]
+    fn only_contains_fails_if_no_match() {
+        use std::io::Write;
+        let mut file = tempfile::NamedTempFile::new().unwrap();
+        file.write_all(b"not a match").unwrap();
+
+        assert_eq!(
+            check_only_contains_regex(
+                file.path().to_str().unwrap(),
+                "docs.rs/{name}/{version}/{name}/",
+                "foo",
+                "1.2.3"
+            ),
+            Err(format!(
+                r#"{} ... found no matches for "docs.rs/{{name}}/{{version}}/{{name}}/""#,
+                file.path().display()
+            ))
+        );
+    }
 }

src/helpers.rs

@@ -43,7 +43,11 @@ pub fn indent(text: &str) -> String {
 }
 
 /// Verify that the version range request matches the given version.
-#[cfg(any(feature = "html_root_url_updated", feature = "markdown_deps_updated"))]
+#[cfg(any(
+    feature = "html_root_url_updated",
+    feature = "markdown_deps_updated",
+    feature = "contains_regex"
+))]
 pub fn version_matches_request(
     version: &semver::Version,
     request: &semver::VersionReq,

src/lib.rs

@@ -15,6 +15,9 @@
 //!   version. See [`assert_contains_regex`] and
 //!   [`assert_contains_substring`].
 //!
+//! * A `README.md` file which should only mention the current
+//!   version. See    [`assert_only_contains_regex`].
+//!
 //! * The [`html_root_url`] attribute that tells other crates where to
 //!   find your documentation. See [`assert_html_root_url_updated`].
 //!
@@ -65,7 +68,8 @@
 //!
 //! * `markdown_deps_updated` enables [`assert_markdown_deps_updated`].
 //! * `html_root_url_updated` enables [`assert_html_root_url_updated`].
-//! * `contains_regex` enables [`assert_contains_regex`].
+//! * `contains_regex` enables [`assert_contains_regex`] and
+//!   [`assert_only_contains_regex`].
 //!
 //! All of these features are enabled by default. If you disable all
 //! of them, you can still use [`assert_contains_substring`] to
@@ -88,7 +92,7 @@ mod html_root_url;
 mod markdown_deps;
 
 #[cfg(feature = "contains_regex")]
-pub use crate::contains_regex::check_contains_regex;
+pub use crate::contains_regex::{check_contains_regex, check_only_contains_regex};
 pub use crate::contains_substring::check_contains_substring;
 #[cfg(feature = "html_root_url_updated")]
 pub use crate::html_root_url::check_html_root_url;
@@ -325,3 +329,70 @@ macro_rules! assert_contains_regex {
         }
     };
 }
+
+/// Assert that all versions numbers are up to date via a regex.
+///
+/// This macro allows you verify that the current version number is
+/// mentioned in a particular file, such as a README file. You do this
+/// by specifying a regular expression which will be matched against
+/// the contents of the file.
+///
+/// The macro calls [`check_only_contains_regex`] on the file name
+/// given. The package name and current package version is
+/// automatically taken from the `$CARGO_PKG_NAME` and
+/// `$CARGO_PKG_VERSION` environment variables. These environment
+/// variables are automatically set by Cargo when compiling your
+/// crate.
+///
+/// This macro is enabled by the `contains_regex` feature.
+///
+/// # Usage
+///
+/// The typical way to use this macro is from an integration test:
+///
+/// ```rust
+/// #[test]
+/// # fn fake_hidden_test_case() {}
+/// # // The above function ensures test_readme_mentions_version is
+/// # // compiled.
+/// fn test_readme_links_are_updated() {
+///     version_sync::assert_only_contains_regex!("README.md", "docs.rs/{name}/{version}/");
+/// }
+///
+/// # fn main() {
+/// #     test_readme_links_are_updated();
+/// # }
+/// ```
+///
+/// Tests are run with the current directory set to directory where
+/// your `Cargo.toml` file is, so this will find a `README.md` file
+/// next to your `Cargo.toml` file. It will then check that all links
+/// to docs.rs for your crate contain the current version of your
+/// crate.
+///
+/// The regular expression can contain placeholders which are replaced
+/// as follows:
+///
+/// * `{version}`: the version number of your package.
+/// * `{name}`: the name of your package.
+///
+/// The `{version}` placeholder will match compatible versions,
+/// meaning that `{version}` will match all of `1.2.3`, `1.2`, and `1`
+/// when your package is at version `1.2.3`.
+///
+/// # Panics
+///
+/// If the regular expression cannot be found or if some matches are
+/// not updated, `panic!` will be invoked and your integration test
+/// will fail.
+#[macro_export]
+#[cfg(feature = "contains_regex")]
+macro_rules! assert_only_contains_regex {
+    ($path:expr, $format:expr) => {
+        let pkg_name = env!("CARGO_PKG_NAME");
+        let pkg_version = env!("CARGO_PKG_VERSION");
+        if let Err(err) = $crate::check_only_contains_regex($path, $format, pkg_name, pkg_version) {
+            panic!("{}", err);
+        }
+    };
+}