1 files changed, 53 insertions, 0 deletions
diff --git a/crates/shirabe/src/console/github_action_error.rs b/crates/shirabe/src/console/github_action_error.rs
index 880a7e2..cb6a181 100644
--- a/crates/shirabe/src/console/github_action_error.rs
+++ b/crates/shirabe/src/console/github_action_error.rs
@@ -1 +1,54 @@
 //! ref: composer/src/Composer/Console/GithubActionError.php
+
+use crate::io::io_interface::IOInterface;
+use crate::util::platform::Platform;
+
+#[derive(Debug)]
+pub struct GithubActionError {
+    pub(crate) io: Box<dyn IOInterface>,
+}
+
+impl GithubActionError {
+    pub fn new(io: Box<dyn IOInterface>) -> Self {
+        Self { io }
+    }
+
+    pub fn emit(&mut self, message: &str, file: Option<&str>, line: Option<i64>) {
+        if Platform::get_env("GITHUB_ACTIONS").map_or(false, |v| !v.is_empty())
+            && !Platform::get_env("COMPOSER_TESTS_ARE_RUNNING").map_or(false, |v| !v.is_empty())
+        {
+            let message = self.escape_data(message);
+
+            let file_truthy = file.map_or(false, |f| !f.is_empty());
+            let line_truthy = line.map_or(false, |l| l != 0);
+
+            if file_truthy && line_truthy {
+                let file = self.escape_property(file.unwrap());
+                self.io.write(&format!("::error file={},line={}::{}", file, line.unwrap(), message));
+            } else if file_truthy {
+                let file = self.escape_property(file.unwrap());
+                self.io.write(&format!("::error file={}::{}", file, message));
+            } else {
+                self.io.write(&format!("::error ::{}", message));
+            }
+        }
+    }
+
+    fn escape_data(&self, data: &str) -> String {
+        // see https://github.com/actions/toolkit/blob/4f7fb6513a355689f69f0849edeb369a4dc81729/packages/core/src/command.ts#L80-L85
+        let data = data.replace('%', "%25");
+        let data = data.replace('\r', "%0D");
+        let data = data.replace('\n', "%0A");
+        data
+    }
+
+    fn escape_property(&self, property: &str) -> String {
+        // see https://github.com/actions/toolkit/blob/4f7fb6513a355689f69f0849edeb369a4dc81729/packages/core/src/command.ts#L87-L94
+        let property = property.replace('%', "%25");
+        let property = property.replace('\r', "%0D");
+        let property = property.replace('\n', "%0A");
+        let property = property.replace(':', "%3A");
+        let property = property.replace(',', "%2C");
+        property
+    }
+}