feat(git_commit): add git tag to module (#950)

docs/config/README.md

@@ -1043,16 +1043,18 @@ truncation_symbol = ""
 
 ## Git Commit
 
-The `git_commit` module shows the current commit hash of the repo in your current directory.
+The `git_commit` module shows the current commit hash and also the tag (if any) of the repo in your current directory.
 
 ### Options
 
 | Option               | Default                                        | Description                                           |
-| -------------------- | ------------------------ | ----------------------------------------------------- |
+| -------------------- | ---------------------------------------------- | ----------------------------------------------------- |
 | `commit_hash_length` | `7`                                            | The length of the displayed git commit hash.          |
-| `format`             | `'[\($hash\)]($style) '` | The format for the module.                            |
+| `format`             | `"[\\($hash\\)]($style) [\\($tag\\)]($style)"` | The format for the module.                            |
 | `style`              | `"bold green"`                                 | The style for the module.                             |
 | `only_detached`      | `true`                                         | Only show git commit hash when in detached HEAD state |
+| `tag_disabled`       | `true`                                         | Disables showing tag info in `git_commit` module.     |
+| `tag_symbol`         | `"🏷 "`                                        | Tag symbol prefixing the info shown                   |
 | `disabled`           | `false`                                        | Disables the `git_commit` module.                     |
 
 ### Variables
@@ -1071,6 +1073,7 @@ The `git_commit` module shows the current commit hash of the repo in your curren
 
 [git_commit]
 commit_hash_length = 4
+tag_symbol = "🔖 "
 ```
 
 ## Git State

src/configs/git_commit.rs

@@ -9,6 +9,8 @@ pub struct GitCommitConfig<'a> {
     pub style: &'a str,
     pub only_detached: bool,
     pub disabled: bool,
+    pub tag_symbol: &'a str,
+    pub tag_disabled: bool,
 }
 
 impl<'a> RootModuleConfig<'a> for GitCommitConfig<'a> {
@@ -16,10 +18,12 @@ impl<'a> RootModuleConfig<'a> for GitCommitConfig<'a> {
         GitCommitConfig {
             // be consistent with git by default, which has DEFAULT_ABBREV set to 7
             commit_hash_length: 7,
-            format: "[\\($hash\\)]($style) ",
+            format: "[\\($hash$tag\\)]($style) ",
             style: "green bold",
             only_detached: true,
             disabled: false,
+            tag_symbol: "🏷  ",
+            tag_disabled: true,
         }
     }
 }

src/modules/git_commit.rs

@@ -24,7 +24,9 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let head_commit = git_head.peel_to_commit().ok()?;
     let commit_oid = head_commit.id();
 
-    let parsed = StringFormatter::new(config.format).and_then(|formatter| {
+    let mut parsed;
+
+    parsed = StringFormatter::new(config.format).and_then(|formatter| {
         formatter
             .map_style(|variable| match variable {
                 "style" => Some(Ok(config.style)),
@@ -40,6 +42,48 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
             .parse(None)
     });
 
+    if !config.tag_disabled {
+        // Let's get repo tags names
+        let tag_names = git_repo.tag_names(None).ok()?;
+        let tag_and_refs = tag_names.iter().flat_map(|name| {
+            let full_tag = format!("refs/tags/{}", name.unwrap());
+            git_repo
+                .find_reference(&full_tag)
+                .map(|reference| (String::from(name.unwrap()), reference))
+        });
+
+        let mut tag_name = String::new();
+        // Let's check if HEAD has some tag. If several, only gets first...
+        for (name, reference) in tag_and_refs {
+            if commit_oid == reference.peel_to_commit().ok()?.id() {
+                tag_name = name;
+                break;
+            }
+        }
+        // If we have tag...
+        if !tag_name.is_empty() {
+            parsed = StringFormatter::new(config.format).and_then(|formatter| {
+                formatter
+                    .map_style(|variable| match variable {
+                        "style" => Some(Ok(config.style)),
+                        _ => None,
+                    })
+                    .map(|variable| match variable {
+                        "hash" => Some(Ok(id_to_hex_abbrev(
+                            commit_oid.as_bytes(),
+                            config.commit_hash_length,
+                        ))),
+                        _ => None,
+                    })
+                    .map(|variable| match variable {
+                        "tag" => Some(Ok(format!(" {}{}", &config.tag_symbol, &tag_name))),
+                        _ => None,
+                    })
+                    .parse(None)
+            });
+        }
+    };
+
     module.set_segments(match parsed {
         Ok(segments) => segments,
         Err(error) => {
@@ -196,4 +240,99 @@ mod tests {
         assert_eq!(expected, actual);
         repo_dir.close()
     }
+
+    #[test]
+    fn test_render_commit_hash_with_tag_enabled() -> io::Result<()> {
+        let repo_dir = fixture_repo(FixtureProvider::GIT)?;
+
+        let mut git_commit = Command::new("git")
+            .args(&["rev-parse", "HEAD"])
+            .current_dir(&repo_dir.path())
+            .output()?
+            .stdout;
+        git_commit.truncate(7);
+        let commit_output = str::from_utf8(&git_commit).unwrap().trim();
+
+        let git_tag = Command::new("git")
+            .args(&["describe", "--tags", "--exact-match", "HEAD"])
+            .current_dir(&repo_dir.path())
+            .output()?
+            .stdout;
+        let tag_output = str::from_utf8(&git_tag).unwrap().trim();
+
+        let expected_output = format!("{} {}", commit_output, tag_output);
+
+        let actual = ModuleRenderer::new("git_commit")
+            .config(toml::toml! {
+                [git_commit]
+                    only_detached = false
+                    tag_disabled = false
+                    tag_symbol = ""
+            })
+            .path(&repo_dir.path())
+            .collect();
+
+        let expected = Some(format!(
+            "{} ",
+            Color::Green
+                .bold()
+                .paint(format!("({})", expected_output.trim()))
+                .to_string()
+        ));
+
+        assert_eq!(expected, actual);
+        Ok(())
+    }
+
+    #[test]
+    fn test_render_commit_hash_only_detached_on_detached_with_tag_enabled() -> io::Result<()> {
+        let repo_dir = fixture_repo(FixtureProvider::GIT)?;
+
+        Command::new("git")
+            .args(&["checkout", "@~1"])
+            .current_dir(&repo_dir.path())
+            .output()?;
+
+        Command::new("git")
+            .args(&["tag", "tagOnDetached", "-m", "Testing tags on detached"])
+            .current_dir(&repo_dir.path())
+            .output()?;
+
+        let mut git_commit = Command::new("git")
+            .args(&["rev-parse", "HEAD"])
+            .current_dir(&repo_dir.path())
+            .output()?
+            .stdout;
+        git_commit.truncate(7);
+        let commit_output = str::from_utf8(&git_commit).unwrap().trim();
+
+        let git_tag = Command::new("git")
+            .args(&["describe", "--tags", "--exact-match", "HEAD"])
+            .current_dir(&repo_dir.path())
+            .output()?
+            .stdout;
+        let tag_output = str::from_utf8(&git_tag).unwrap().trim();
+
+        let expected_output = format!("{} {}", commit_output, tag_output);
+
+        let actual = ModuleRenderer::new("git_commit")
+            .config(toml::toml! {
+                [git_commit]
+                    tag_disabled = false
+                    tag_symbol = ""
+            })
+            .path(&repo_dir.path())
+            .collect();
+
+        let expected = Some(format!(
+            "{} ",
+            Color::Green
+                .bold()
+                .paint(format!("({})", expected_output.trim()))
+                .to_string()
+        ));
+
+        assert_eq!(expected, actual);
+        Ok(())
+    }
 }

src/modules/mod.rs

@@ -155,7 +155,7 @@ pub fn description(module: &str) -> &'static str {
         "erlang" => "Current OTP version",
         "gcloud" => "The current GCP client configuration",
         "git_branch" => "The active branch of the repo in your current directory",
-        "git_commit" => "The active commit of the repo in your current directory",
+        "git_commit" => "The active commit (and tag if any) of the repo in your current directory",
         "git_state" => "The current git operation, and it's progress",
         "git_status" => "Symbol representing the state of the repo",
         "golang" => "The currently installed version of Golang",