From d60b3fbf8d1840e5a1b5b088333e136616068c15 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Sun, 4 Apr 2021 12:30:52 +0300
Subject: feat: set version in debian/changelog

---
 bumper.md         | 11 +++++++++++
 src/bin/bumper.rs |  5 +++--
 src/debian.rs     | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 src/errors.rs     |  6 ++++++
 src/lib.rs        |  1 +
 src/project.rs    | 18 +++++++++++++++---
 6 files changed, 82 insertions(+), 5 deletions(-)
 create mode 100644 src/debian.rs

diff --git a/bumper.md b/bumper.md
index b4a269f..130e980 100644
--- a/bumper.md
+++ b/bumper.md
@@ -92,11 +92,14 @@ project. We use a Rust project for simplicity.
 ~~~scenario
 given an installed Bumper
 given file foo/Cargo.toml from Cargo.toml
+given file foo/debian/changelog from changelog
 given all files in foo are committed to git
 given the HEAD commit in foo is COMMIT
 when I run, in foo, bumper 1.2.0
 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"/
+then file foo/debian/changelog matches regex / \(0\.1\.0-1\) /
+then file foo/debian/changelog matches regex / \(1\.2\.0-1\) /
 ~~~
 
 ~~~{#Cargo.toml .file .ini}
@@ -109,6 +112,14 @@ edition = "2018"
 [dependencies]
 ~~~
 
+~~~{#changelog .file}
+dummy (0.1.0-1) unstable; urgency=low
+
+  * This is a debian/changelog file. Syntax is finicky.
+
+ -- Lars Wirzenius <liw@liw.fi>  Tue, 30 Mar 2021 08:33:35 +0300
+~~~
+
 
 
 ---
diff --git a/src/bin/bumper.rs b/src/bin/bumper.rs
index 564b589..08242ed 100644
--- a/src/bin/bumper.rs
+++ b/src/bin/bumper.rs
@@ -17,8 +17,9 @@ fn bumper() -> Result<(), BumperError> {
     info!("Bumper starts");
     let opt = Opt::from_args();
 
-    let mut project = ProjectKind::detect(".")?;
-    project.set_version(&opt.version)?;
+    for mut kind in ProjectKind::detect(".")? {
+        kind.set_version(&opt.version)?;
+    }
 
     git::tag(&opt.version)?;
     info!("Bumper ends OK");
diff --git a/src/debian.rs b/src/debian.rs
new file mode 100644
index 0000000..d82a14a
--- /dev/null
+++ b/src/debian.rs
@@ -0,0 +1,46 @@
+use crate::errors::BumperError;
+use log::{debug, info};
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+pub struct Debian {
+    dirname: PathBuf,
+}
+
+impl Debian {
+    pub fn new(dirname: &Path) -> Result<Self, BumperError> {
+        let changelog = dirname.join("debian/changelog");
+        if changelog.exists() {
+            info!("directory {} contains Debian packaging", dirname.display());
+            return Ok(Self {
+                dirname: dirname.to_path_buf(),
+            });
+        }
+        debug!(
+            "directory {} doesn't contains Debian packaging",
+            dirname.display()
+        );
+        Err(BumperError::UnknownProjectKind(dirname.to_path_buf()))
+    }
+
+    pub fn set_version(&mut self, version: &str) -> Result<(), BumperError> {
+        let version = format!("{}-1", version);
+        self.dch(&["-v", &version, ""])?;
+        self.dch(&["-r", ""])?;
+        Ok(())
+    }
+
+    fn dch(&self, args: &[&str]) -> Result<(), BumperError> {
+        let output = Command::new("dch")
+            .args(args)
+            .current_dir(&self.dirname)
+            .output()
+            .map_err(|err| BumperError::DchInvoke(self.dirname.to_path_buf(), err))?;
+        if output.status.success() {
+            Ok(())
+        } else {
+            let stderr = String::from_utf8_lossy(&output.stderr).into_owned();
+            Err(BumperError::Dch(self.dirname.to_path_buf(), stderr))
+        }
+    }
+}
diff --git a/src/errors.rs b/src/errors.rs
index c7febe3..3eb8605 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -37,6 +37,12 @@ pub enum BumperError {
 
     #[error("Command 'git tag' failed: {0}")]
     GitTag(String),
+
+    #[error("Failed to run dch in {0}: {1}")]
+    DchInvoke(PathBuf, #[source] std::io::Error),
+
+    #[error("dch failed in {0}: {1}")]
+    Dch(PathBuf, String),
 }
 
 impl BumperError {
diff --git a/src/lib.rs b/src/lib.rs
index 06071a6..51ddd5f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
+pub mod debian;
 pub mod errors;
 pub mod git;
 pub mod project;
diff --git a/src/project.rs b/src/project.rs
index 7471c66..9f45363 100644
--- a/src/project.rs
+++ b/src/project.rs
@@ -1,25 +1,37 @@
+use crate::debian::Debian;
 use crate::errors::BumperError;
 use crate::rust::Rust;
 use std::path::Path;
 
 pub enum ProjectKind {
     Rust(Rust),
+    Debian(Debian),
 }
 
 impl ProjectKind {
-    pub fn detect<P: AsRef<Path>>(dirname: P) -> Result<ProjectKind, BumperError> {
+    pub fn detect<P: AsRef<Path>>(dirname: P) -> Result<Vec<ProjectKind>, BumperError> {
         let dirname = dirname.as_ref();
+        let mut kinds = vec![];
 
         if let Ok(p) = Rust::new(dirname) {
-            return Ok(Self::Rust(p));
+            kinds.push(ProjectKind::Rust(p));
         }
 
-        Err(BumperError::UnknownProjectKind(dirname.to_path_buf()))
+        if let Ok(p) = Debian::new(dirname) {
+            kinds.push(ProjectKind::Debian(p));
+        }
+
+        if kinds.is_empty() {
+            Err(BumperError::UnknownProjectKind(dirname.to_path_buf()))
+        } else {
+            Ok(kinds)
+        }
     }
 
     pub fn set_version(&mut self, version: &str) -> Result<(), BumperError> {
         match self {
             Self::Rust(ref mut rust) => rust.set_version(version)?,
+            Self::Debian(ref mut debian) => debian.set_version(version)?,
         }
         Ok(())
     }
-- 
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