From ca252d4a19d808ae476b14f6a19471ff7da58141 Mon Sep 17 00:00:00 2001
From: Packy <lpreterite@126.com>
Date: Mon, 26 Apr 2021 17:00:15 +0800
Subject: [PATCH 1/4] Support page header setting of changelog file

It is the same as the conventional-changelog-config-spec setting of standard-version.
---
 index.js | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index 7fda6c7..ced65d8 100644
--- a/index.js
+++ b/index.js
@@ -90,8 +90,18 @@ class ConventionalChangelog extends Plugin {
     });
   }
 
-  async writeChangelog() {
+  getOldChangelog() {
     const { infile } = this.options;
+    return new Promise((resolve, reject) => {
+      const readStream = fs.createReadStream(infile);
+      const resolver = result => resolve(result.toString().trim());
+      readStream.pipe(concat(resolver));
+      readStream.on('error', reject);
+    });
+  }
+
+  async writeChangelog() {
+    const { infile, header } = this.options;
     let { changelog } = this.config.getContext();
 
     let hasInfile = false;
@@ -102,12 +112,20 @@ class ConventionalChangelog extends Plugin {
       this.debug(err);
     }
 
+    let oldChangelog = ""
+    try{
+      oldChangelog = await this.getOldChangelog();
+      oldChangelog = oldChangelog.replace(new RegExp(EOL, 'g'), '\n').replace(header, '');
+    }catch(err){
+      this.debug(err);
+    }
+
     if (!hasInfile) {
       changelog = await this.generateChangelog({ releaseCount: 0 });
       this.debug({ changelog });
     }
 
-    await prependFile(infile, changelog + EOL + EOL);
+    fs.writeFileSync(infile, header + EOL + EOL + changelog + EOL + EOL + oldChangelog);
 
     if (!hasInfile) {
       await this.exec(`git add ${infile}`);

From 159ee8120d9c65edbf4bf0d3db173a54a39c6aa7 Mon Sep 17 00:00:00 2001
From: Packy <lpreterite@126.com>
Date: Thu, 10 Feb 2022 15:37:23 +0800
Subject: [PATCH 2/4] Update tests to support header settings

---
 test.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/test.js b/test.js
index 264596e..4c78ac7 100644
--- a/test.js
+++ b/test.js
@@ -130,15 +130,16 @@ test('should use provided version', async t => {
 });
 
 test(`should write and update infile (${infile})`, async t => {
-  const options = { [namespace]: { preset, infile }, git };
+  const header = "The header"
+  const options = { [namespace]: { preset, infile, header }, git };
   const plugin = factory(Plugin, { namespace, options });
   await runTasks(plugin);
   const changelog = fs.readFileSync(infile);
-  assert.strictEqual(changelog.toString().trim(), 'The changelog');
+  assert.strictEqual(changelog.toString().trim(), `${header}${EOL}${EOL}The changelog`);
   {
     await runTasks(plugin);
     const changelog = fs.readFileSync(infile);
-    assert.strictEqual(changelog.toString().trim(), `The changelog${EOL}${EOL}The changelog`);
+    assert.strictEqual(changelog.toString().trim(), `${header}${EOL}${EOL}The changelog${EOL}${EOL}The changelog`);
   }
   fs.unlinkSync(infile);
 });

From 508dad6af4bd63df12efda384c26b120fcc8fee5 Mon Sep 17 00:00:00 2001
From: Packy <lpreterite@126.com>
Date: Thu, 10 Feb 2022 15:38:22 +0800
Subject: [PATCH 3/4] fix extra line break logic

---
 index.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index ced65d8..904e982 100644
--- a/index.js
+++ b/index.js
@@ -115,7 +115,7 @@ class ConventionalChangelog extends Plugin {
     let oldChangelog = ""
     try{
       oldChangelog = await this.getOldChangelog();
-      oldChangelog = oldChangelog.replace(new RegExp(EOL, 'g'), '\n').replace(header, '');
+      oldChangelog = oldChangelog.replace(header, '');
     }catch(err){
       this.debug(err);
     }
@@ -125,7 +125,7 @@ class ConventionalChangelog extends Plugin {
       this.debug({ changelog });
     }
 
-    fs.writeFileSync(infile, header + EOL + EOL + changelog + EOL + EOL + oldChangelog);
+    fs.writeFileSync(infile, header + EOL + EOL + changelog + oldChangelog);
 
     if (!hasInfile) {
       await this.exec(`git add ${infile}`);

From 9bb248236fafbfe97bd8f768992d18bbb1e0cc26 Mon Sep 17 00:00:00 2001
From: Packy <lpreterite@126.com>
Date: Wed, 23 Feb 2022 17:48:22 +0800
Subject: [PATCH 4/4] replace header newline symbol

---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 904e982..00218b0 100644
--- a/index.js
+++ b/index.js
@@ -115,7 +115,7 @@ class ConventionalChangelog extends Plugin {
     let oldChangelog = ""
     try{
       oldChangelog = await this.getOldChangelog();
-      oldChangelog = oldChangelog.replace(header, '');
+      oldChangelog = oldChangelog.replace(header.split(/\r\n|\r|\n/g).join(EOL), '');
     }catch(err){
       this.debug(err);
     }