feat(import): Add --directory option

This option maps to `git apply --directory`.

Fixes: #36

completion/stgit.zsh

@@ -709,6 +709,7 @@ _stg-import() {
     subcmd_args+=(
         '(-n --name)'{-n,--name}'[name for imported patch]'
         '(-p --strip)'{-p+,--strip=}'[remove N leading directories from diff paths]:num'
+        '--directory[prepend root to all filenames]:root:_directories'
         '(-t --stripname)'{-t,--stripname}'[strip number and extension from patch name]'
         '-C=[ensure N lines of surrounding context for each change]:num'
         '(-3 --3way)'{-3,--3way}'[attempt three-way merge]'

src/cmd/fold.rs

@@ -124,6 +124,7 @@ fn run(matches: &clap::ArgMatches) -> Result<()> {
             reject_flag,
             false,
             strip_level,
+            None,
             context_lines,
         ) {
             stupid.read_tree_checkout_hard(orig_head_tree_id)?;
@@ -137,6 +138,13 @@ fn run(matches: &clap::ArgMatches) -> Result<()> {
             Err(crate::stack::Error::CausedConflicts("Merge conflicts".to_string()).into())
         }
     } else {
-        stupid.apply_to_worktree_and_index(&diff, reject_flag, false, strip_level, context_lines)
+        stupid.apply_to_worktree_and_index(
+            &diff,
+            reject_flag,
+            false,
+            strip_level,
+            None,
+            context_lines,
+        )
     }
 }

src/cmd/import.rs

@@ -132,6 +132,18 @@ fn make() -> clap::Command {
                 .value_name("n")
                 .value_parser(crate::argset::parse_usize),
         )
+        .arg(
+            Arg::new("directory")
+                .long("directory")
+                .help("Prepend <root> to all filenames")
+                .long_help(
+                    "Prepend <root> to all filenames. If a \"-p\" argument is also \
+                    passed, it is applied before prepending the new root.",
+                )
+                .value_name("root")
+                .value_parser(clap::value_parser!(PathBuf))
+                .value_hint(clap::ValueHint::DirPath),
+        )
         .arg(
             Arg::new("stripname")
                 .long("stripname")
@@ -640,6 +652,9 @@ fn create_patch<'repo>(
             matches.get_flag("reject"),
             matches.get_flag("3way"),
             strip_level,
+            matches
+                .get_one::<PathBuf>("directory")
+                .map(|path_buf| path_buf.as_path()),
             matches.get_one::<usize>("context-lines").copied(),
         )?;
 

src/cmd/sync.rs

@@ -297,7 +297,7 @@ fn series_merge_patch(
     stupid.update_index_refresh()?;
     stupid.read_tree_checkout(trans.get_branch_head().tree_id(), parent.tree_id())?;
     stupid
-        .apply_to_worktree_and_index(&diff, false, false, None, None)
+        .apply_to_worktree_and_index(&diff, false, false, None, None, None)
         .with_context(|| format!("applying {patchname} from series"))?;
     stupid.update_index_refresh()?;
 

src/stupid/mod.rs

@@ -141,6 +141,7 @@ impl<'repo, 'index> StupidContext<'repo, 'index> {
         reject: bool,
         threeway: bool,
         strip_level: Option<usize>,
+        directory: Option<&Path>,
         context_lines: Option<usize>,
     ) -> Result<()> {
         let mut command = self.git_in_work_root();
@@ -154,6 +155,10 @@ impl<'repo, 'index> StupidContext<'repo, 'index> {
         if let Some(strip_level) = strip_level {
             command.arg(format!("-p{strip_level}"));
         }
+        if let Some(directory) = directory {
+            command.arg("--directory");
+            command.arg(directory);
+        }
         if let Some(context_lines) = context_lines {
             command.arg(format!("-C{context_lines}"));
         }