Ely Office: six offline-first desktop apps in Rust and GPUI

ElyDoc, ElyTable, ElyShow (LibreOfficeKit), ElyPDF (MuPDF), ElyTree (Git),
ElyMark (Milkdown and CodeMirror in CEF). ElyMail and ElyAgent follow.

apps/ely-tree/src/commit.rs

@@ -0,0 +1,54 @@
+//! Committing: message, amend, identity, signing as set (TREE-05).
+
+use std::{io, path::Path};
+
+use crate::git::Git;
+
+/// Who commits, and how Git signs, as Git's settings say.
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
+pub struct Me {
+    pub name: Option<String>,
+    pub email: Option<String>,
+    /// `openpgp`, `ssh` or `x509` when commits are signed.
+    pub signs: Option<String>,
+}
+
+/// A setting as Git resolves it; None when unset.
+fn setting(git: &Git, root: &Path, key: &str) -> io::Result<Option<String>> {
+    let said = git.run_or_one(root, &["config", "--get", key])?;
+    let said = String::from_utf8_lossy(&said).trim().to_string();
+    Ok((!said.is_empty()).then_some(said))
+}
+
+pub fn me(git: &Git, root: &Path) -> io::Result<Me> {
+    let signs = git.run_or_one(root, &["config", "--type=bool", "--get", "commit.gpgsign"])?;
+    let signs = match String::from_utf8_lossy(&signs).trim() {
+        "true" => Some(setting(git, root, "gpg.format")?.unwrap_or_else(|| "openpgp".into())),
+        _ => None,
+    };
+    Ok(Me {
+        name: setting(git, root, "user.name")?,
+        email: setting(git, root, "user.email")?,
+        signs,
+    })
+}
+
+/// The last commit's whole message, to amend.
+pub fn last_message(git: &Git, root: &Path) -> io::Result<String> {
+    let said = git.run(root, &["log", "-1", "--format=%B"])?;
+    Ok(String::from_utf8_lossy(&said).trim_end().to_string())
+}
+
+/// Subject and body as one message: a blank line between.
+pub fn message(subject: &str, body: &str) -> String {
+    match body.trim() {
+        "" => subject.trim().to_string(),
+        body => format!("{}\n\n{body}", subject.trim()),
+    }
+}
+
+/// A message back to subject and body.
+pub fn split(message: &str) -> (String, String) {
+    let (subject, body) = message.split_once('\n').unwrap_or((message, ""));
+    (subject.trim().to_string(), body.trim().to_string())
+}