fix: Pop head when running replace with multi-line

src/app.rs

@@ -1,6 +1,7 @@
 use anyhow::Result;
 use chrono::Local;
 use semver::Version;
+use std::collections::VecDeque;
 use std::fs::{read_to_string, File};
 use std::io::prelude::*;
 use std::path::PathBuf;
@@ -46,16 +47,17 @@ fn make_context(current_version: &Version, new_version: &Version) -> Context {
     ctx
 }
 
-fn build_updates(input: String, seach_text: String, replace_text: String) -> String {
-    let lines = seach_text.split("\n").count();
-    let mut buf: Vec<String> = Vec::new();
+fn build_updates(input: String, search_text: String, replace_text: String) -> String {
+    let lines = search_text.split("\n").count();
+    let mut buf: VecDeque<String> = VecDeque::new();
     let mut output: Vec<String> = Vec::new();
     for line in input.split("\n") {
         if buf.len() == lines {
-            output.push(buf.pop().unwrap());
+            output.push(buf.pop_front().unwrap());
         }
-        buf.push(line.to_string());
-        if buf.join("\n") == seach_text {
+        buf.push_back(line.to_string());
+        let buf_vec: Vec<String> = buf.clone().into();
+        if buf_vec.join("\n") == search_text {
             output.push(replace_text.to_string());
             buf.clear();
         }

tests/test_update.py

@@ -87,16 +87,36 @@ def test_valid_conf__multi_line(cmd, tmp_path: Path):  # noqa: D103
     Target
     ======
 
-    v {{new_version}}
-    -----------------
+    v{{new_version}}
+    ------
     """
     '''
     )
     (tmp_path / ".age.toml").write_text(conf_text)
     data_txt = tmp_path / "data.txt"
-    data_txt.write_text("Target\n======\n")
+    before = textwrap.dedent("""\
+    ====
+    Data
+    ====
+
+    Target
+    ======
+    """)
+    after = textwrap.dedent("""\
+    ====
+    Data
+    ====
+
+    Target
+    ======
+
+    v0.2.0
+    ------
+    """)
+    data_txt.write_text(before)
 
     proc = cmd("update", "0.2.0")
+    print(data_txt.read_text())
     assert proc.returncode == 0
-    assert len(data_txt.read_text().split("\n")) == 6
-    assert "v 0.2.0" in data_txt.read_text()
+    assert len(data_txt.read_text().split("\n")) == 10
+    assert data_txt.read_text() == after