Nushell br function (#647)

Install the br function for nushell.

To have this function installed on a previously installed version of broot, run `broot --install`

Fix #375

12 files changed, 268 insertions, 64 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 6624b7d..f3ccc61 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ license = "MIT"
 categories = ["command-line-utilities"]
 readme = "README.md"
 build = "build.rs"
-rust-version = "1.60"
+rust-version = "1.65"
 exclude = ["website", "broot*.zip"]
 
 [features]
diff --git a/bacon.toml b/bacon.toml
index a9f8f22..4ed8990 100644
--- a/bacon.toml
+++ b/bacon.toml
@@ -42,6 +42,7 @@ command = [
 	"-A", "clippy::module_inception",
 	"-A", "clippy::neg_multiply",
 	"-A", "clippy::vec_init_then_push",
+	"-A", "clippy::if_same_then_else",
 ]
 need_stdout = false
 
diff --git a/src/cli/mod.rs b/src/cli/mod.rs
index 6b56c36..7456337 100644
--- a/src/cli/mod.rs
+++ b/src/cli/mod.rs
@@ -72,7 +72,12 @@ pub fn run() -> Result<Option<Launchable>, ProgramError> {
     // configuration
     if specific_conf.is_none() && install_args.install != Some(false) {
         let mut shell_install = ShellInstall::new(install_args.install == Some(true));
-        shell_install.check()?;
+        // TODO clean the next few lines when inspect_err is stable
+        let res = shell_install.check();
+        if let Err(e) = &res {
+            shell_install.comment_error(e);
+        }
+        res?;
         if shell_install.should_quit {
             return Ok(None);
         }
@@ -137,7 +142,7 @@ pub fn run() -> Result<Option<Launchable>, ProgramError> {
 }
 
 /// wait for user input, return `true` if they didn't answer 'n'
-pub fn ask_authorization() -> Result<bool, ProgramError> {
+pub fn ask_authorization() -> io::Result<bool> {
     let mut answer = String::new();
     io::stdin().read_line(&mut answer)?;
     let answer = answer.trim();
diff --git a/src/errors.rs b/src/errors.rs
index e1571bb..5ae94d5 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -8,28 +8,59 @@ use {
 };
 
 custom_error! {pub ProgramError
-    Io {source: io::Error} = "IO Error : {source}",
-    Termimad {source: termimad::Error} = "Termimad Error : {source}",
+    AmbiguousVerbName {name: String} = "Ambiguous name: More than one verb matches {name:?}",
+    ArgParse {bad: String, valid: String} = "{bad:?} can't be parsed (valid values: {valid:?})",
     Conf {source: ConfError} = "Bad configuration: {source}",
     ConfFile {path:String, details: ConfError} = "Bad configuration file {path:?} : {details}",
-    ArgParse {bad: String, valid: String} = "{bad:?} can't be parsed (valid values: {valid:?})",
-    UnknownVerb {name: String} = "No verb matches {name:?}",
-    AmbiguousVerbName {name: String} = "Ambiguous name: More than one verb matches {name:?}",
-    UnmatchingVerbArgs {name: String} = "No matching argument found for verb {name:?}",
-    TreeBuild {source: TreeBuildError} = "{source}",
-    LaunchError {program: String, source: io::Error} = "Unable to launch {program}: {source}",
-    UnknowShell {shell: String} = "Unknown shell: {shell}",
+    ImageError {source: ImageError } = "{source}",
     InternalError {details: String} = "Internal error: {details}", // should not happen
     InvalidGlobError {pattern: String} = "Invalid glob: {pattern}",
-    Unrecognized {token: String} = "Unrecognized: {token}",
-    NetError {source: NetError} = "{source}",
-    ImageError {source: ImageError } = "{source}",
+    Io {source: io::Error} = "IO Error : {source}",
+    LaunchError {program: String, source: io::Error} = "Unable to launch {program}: {source}",
     Lfs {details: String} = "Failed to fetch mounts: {details}",
-    ZeroLenFile = "File seems empty",
+    NetError {source: NetError} = "{source}",
+    OpenError { source: opener::OpenError } = "Open error: {source}",
+    ShelInstall { source: ShellInstallError } = "{source}",
+    SyntectCrashed { details: String } = "Syntect crashed on {details:?}",
+    Termimad {source: termimad::Error} = "Termimad Error : {source}",
+    TreeBuild {source: TreeBuildError} = "{source}",
+    UnknowShell {shell: String} = "Unknown shell: {shell}",
+    UnknownVerb {name: String} = "No verb matches {name:?}",
     UnmappableFile = "File can't be mapped",
+    UnmatchingVerbArgs {name: String} = "No matching argument found for verb {name:?}",
     UnprintableFile = "File can't be printed", // has characters that can't be printed without escaping
-    SyntectCrashed { details: String } = "Syntect crashed on {details:?}",
-    OpenError { source: opener::OpenError } = "Open error: {source}",
+    Unrecognized {token: String} = "Unrecognized: {token}",
+    ZeroLenFile = "File seems empty",
+}
+
+custom_error!{pub ShellInstallError
+    Io {source: io::Error, when: String} = "IO Error {source} on {when}",
+}
+impl ShellInstallError {
+    pub fn is_permission_denied(&self) -> bool {
+        match self {
+            Self::Io { source, .. } => {
+                if source.kind() == io::ErrorKind::PermissionDenied {
+                    true
+                } else if cfg!(windows) && source.raw_os_error().unwrap_or(0) == 1314 {
+                    // https://learn.microsoft.com/en-us/windows/win32/debug/system-error-codes--1300-1699-
+                    true
+                } else {
+                    false
+                }
+            }
+        }
+    }
+}
+pub trait IoToShellInstallError<Ok> {
+    fn context(self, f: &dyn Fn() -> String) -> Result<Ok, ShellInstallError>;
+}
+impl<Ok> IoToShellInstallError<Ok> for Result<Ok, io::Error> {
+    fn context(self, f: &dyn Fn() -> String) -> Result<Ok, ShellInstallError> {
+        self.map_err(|source| ShellInstallError::Io {
+            source, when: f()
+        })
+    }
 }
 
 custom_error! {pub TreeBuildError
diff --git a/src/shell_install/bash.rs b/src/shell_install/bash.rs
index 1ebae33..e730e03 100644
--- a/src/shell_install/bash.rs
+++ b/src/shell_install/bash.rs
@@ -13,12 +13,12 @@ use {
     super::{util, ShellInstall},
     crate::{
         conf,
-        errors::ProgramError,
+        errors::*,
     },
     directories::UserDirs,
     lazy_regex::regex,
     regex::Captures,
-    std::{env, fs::OpenOptions, io::Write, path::PathBuf},
+    std::{env, path::PathBuf},
     termimad::{
         mad_print_inline,
     },
@@ -117,7 +117,7 @@ fn get_sourcing_paths() -> Vec<PathBuf> {
 /// check whether the shell function is installed, install
 /// it if it wasn't refused before or if broot is launched
 /// with --install.
-pub fn install(si: &mut ShellInstall) -> Result<(), ProgramError> {
+pub fn install(si: &mut ShellInstall) -> Result<(), ShellInstallError> {
     let script_path = get_script_path();
     si.write_script(&script_path, BASH_FUNC)?;
     let link_path = get_link_path();
@@ -139,13 +139,7 @@ pub fn install(si: &mut ShellInstall) -> Result<(), ProgramError> {
                 &sourcing_path_str,
             );
         } else {
-            let mut shellrc = OpenOptions::new()
-                .write(true)
-                .append(true)
-                .open(sourcing_path)?;
-            shellrc.write_all(b"\n")?;
-            shellrc.write_all(source_line.as_bytes())?;
-            shellrc.write_all(b"\n")?;
+            util::append_to_file(sourcing_path, format!("\n{source_line}\n"))?;
             let is_zsh = sourcing_path_str.contains(".zshrc");
             if is_zsh {
                 mad_print_inline!(
diff --git a/src/shell_install/fish.rs b/src/shell_install/fish.rs
index e56343e..720db20 100644
--- a/src/shell_install/fish.rs
+++ b/src/shell_install/fish.rs
@@ -15,7 +15,7 @@
 
 use {
     super::ShellInstall,
-    crate::{conf, errors::ProgramError},
+    crate::{conf, errors::*},
     directories::BaseDirs,
     directories::ProjectDirs,
     std::path::PathBuf,
@@ -94,7 +94,7 @@ fn get_script_path() -> PathBuf {
 ///
 /// As fish isn't frequently used, we first check that it seems
 /// to be installed. If not, we just do nothing.
-pub fn install(si: &mut ShellInstall) -> Result<(), ProgramError> {
+pub fn install(si: &mut ShellInstall) -> Result<(), ShellInstallError> {
     let fish_dir = get_fish_dir();
     if !fish_dir.exists() {
         debug!("no fish config directory. Assuming fish isn't used.");
diff --git a/src/shell_install/mod.rs b/src/shell_install/mod.rs
index f3de0ac..356c714 100644
--- a/src/shell_install/mod.rs
+++ b/src/shell_install/mod.rs
@@ -2,11 +2,12 @@ use {
     crate::{
         cli::{self, ShellInstallState},
         conf,
-        errors::ProgramError,
+        errors::*,
         skin,
     },
     std::{
-        fs, io, os,
+        fs,
+        os,
         path::{Path, PathBuf},
     },
     termimad::{mad_print_inline, MadSkin},
@@ -14,6 +15,7 @@ use {
 
 mod bash;
 mod fish;
+mod nushell;
 mod util;
 
 const MD_INSTALL_REQUEST: &str = r#"
@@ -34,6 +36,13 @@ If you want the `br` shell function, you may either
 
 "#;
 
+const MD_PERMISSION_DENIED: &str = r#"
+Installation check resulted in **Permission Denied**.
+Please relaunch with elevated privilege.
+This is typically only needed once.
+Error details:
+"#;
+
 const MD_INSTALL_DONE: &str = r#"
 The **br** function has been successfully installed.
 You may have to restart your shell or source your shell init files.
@@ -68,23 +77,29 @@ pub struct ShellInstall {
 /// or test scripts when we don't want the user to be prompted
 /// to install the function, or in case something doesn't properly
 /// work in shell detections
-pub fn write_state(state: ShellInstallState) -> Result<(), ProgramError> {
+pub fn write_state(state: ShellInstallState) -> Result<(), ShellInstallError> {
     let refused_path = get_refused_path();
     let installed_path = get_installed_path();
     if installed_path.exists() {
-        fs::remove_file(&installed_path)?;
+        fs::remove_file(&installed_path)
+            .context(&|| format!("removing {:?}", &installed_path))?;
     }
     if refused_path.exists() {
-        fs::remove_file(&refused_path)?;
+        fs::remove_file(&refused_path)
+            .context(&|| format!("removing {:?}", &refused_path))?;
     }
     match state {
         ShellInstallState::Refused => {
-            fs::create_dir_all(refused_path.parent().unwrap())?;
-            fs::write(&refused_path, REFUSED_FILE_CONTENT)?;
+            fs::create_dir_all(refused_path.parent().unwrap())
+                .context(&|| format!("creating parents of {refused_path:?}"))?;
+            fs::write(&refused_path, REFUSED_FILE_CONTENT)
+                .context(&|| format!("writing in {refused_path:?}"))?;
         }
         ShellInstallState::Installed => {
-            fs::create_dir_all(installed_path.parent().unwrap())?;
-            fs::write(&installed_path, INSTALLED_FILE_CONTENT)?;
+            fs::create_dir_all(installed_path.parent().unwrap())
+                .context(&|| format!("creating parents of {installed_path:?}"))?;
+            fs::write(&installed_path, INSTALLED_FILE_CONTENT)
+                .context(&|| format!("writing in {installed_path:?}"))?;
         }
         _ => {}
     }
@@ -116,6 +131,7 @@ impl ShellInstall {
         match shell {
             "bash" | "zsh" => println!("{}", bash::get_script()),
             "fish" => println!("{}", fish::get_script()),
+            "nushell" => println!("{}", nushell::get_script()),
             _ => {
                 return Err(ProgramError::UnknowShell {
                     shell: shell.to_string(),
@@ -128,7 +144,7 @@ impl ShellInstall {
     /// check whether the shell function is installed, install
     /// it if it wasn't refused before or if broot is launched
     /// with --install.
-    pub fn check(&mut self) -> Result<(), ProgramError> {
+    pub fn check(&mut self) -> Result<(), ShellInstallError> {
         let installed_path = get_installed_path();
         if self.force_install {
             self.skin.print_text("You requested a clean (re)install.");
@@ -152,6 +168,7 @@ impl ShellInstall {
         debug!("Starting install");
         bash::install(self)?;
         fish::install(self)?;
+        nushell::install(self)?;
         self.should_quit = true;
         if self.done {
             self.skin.print_text(MD_INSTALL_DONE);
@@ -159,19 +176,28 @@ impl ShellInstall {
         Ok(())
     }
 
-    pub fn remove(&self, path: &Path) -> io::Result<()> {
+    /// print some additional information on the error (typically before
+    /// the error itself is dumped)
+    pub fn comment_error(&self, err: &ShellInstallError) {
+        if err.is_permission_denied() {
+            self.skin.print_text(MD_PERMISSION_DENIED);
+        }
+    }
+
+    pub fn remove(&self, path: &Path) -> Result<(), ShellInstallError> {
         // path.exists() doesn't work when the file is a link (it checks whether
         // the link destination exists instead of checking the link exists
         // so we first check whether the link exists
         if fs::read_link(path).is_ok() || path.exists() {
             mad_print_inline!(self.skin, "Removing `$0`.\n", path.to_string_lossy());
-            fs::remove_file(path)?;
+            fs::remove_file(path)
+                .context(&|| format!("removing {path:?}"))?;
         }
         Ok(())
     }
 
     /// check whether we're allowed to install.
-    fn can_do(&mut self) -> Result<bool, ProgramError> {
+    fn can_do(&mut self) -> Result<bool, ShellInstallError> {
         if let Some(authorization) = self.authorization {
             return Ok(authorization);
         }
@@ -181,7 +207,8 @@ impl ShellInstall {
             return Ok(false);
         }
         self.skin.print_text(MD_INSTALL_REQUEST);
-        let proceed = cli::ask_authorization()?;
+        let proceed = cli::ask_authorization()
+            .context(&|| "asking user".to_string())?; // read_line failure
         debug!("proceed: {:?}", proceed);
         self.authorization = Some(proceed);
         if !proceed {
@@ -192,7 +219,7 @@ impl ShellInstall {
     }
 
     /// write the script at the given path
-    fn write_script(&self, script_path: &Path, content: &str) -> Result<(), ProgramError> {
+    fn write_script(&self, script_path: &Path, content: &str) -> Result<(), ShellInstallError> {
         self.remove(script_path)?;
         info!("Writing `br` shell function in `{:?}`", &script_path);
         mad_print_inline!(
@@ -200,13 +227,16 @@ impl ShellInstall {
             "Writing *br* shell function in `$0`.\n",
             script_path.to_string_lossy(),
         );
-        fs::create_dir_all(script_path.parent().unwrap())?;
-        fs::write(script_path, content)?;
+        fs::create_dir_all(script_path.parent().unwrap())
+            .context(&|| format!("creating parent dirs to {script_path:?}"))?;
+        fs::write(script_path, content)
+            .context(&|| format!("writing script in {script_path:?}"))?;
         Ok(())
     }
 
+
     /// create a link
-    fn create_link(&self, link_path: &Path, script_path: &Path) -> Result<(), ProgramError> {
+    fn create_link(&self, link_path: &Path, script_path: &Path) -> Result<(), ShellInstallError> {
         info!("Creating link from {:?} to {:?}", &link_path, &script_path);
         self.remove(link_path)?;
         let link_path_str = link_path.to_string_lossy();
@@ -217,11 +247,15 @@ impl ShellInstall {
             &link_path_str,
             &script_path_str,
         );
-        fs::create_dir_all(link_path.parent().unwrap())?;
+        let parent = link_path.parent().unwrap();
+        fs::create_dir_all(parent)
+            .context(&|| format!("creating directory {parent:?}"))?;
         #[cfg(unix)]
-        os::unix::fs::symlink(script_path, link_path)?;
+        os::unix::fs::symlink(script_path, link_path)
+            .context(&|| format!("linking from {link_path:?} to {script_path:?}"))?;
         #[cfg(windows)]
-        os::windows::fs::symlink_file(&script_path, &link_path)?;
+        os::windows::fs::symlink_file(&script_path, &link_path)
+            .context(&|| format!("linking from {link_path:?} to {script_path:?}"))?;
         Ok(())
     }
 }
diff --git a/src/shell_install/nushell.rs b/src/shell_install/nushell.rs
new file mode 100644
index 0000000..228a28f
--- /dev/null
+++ b/src/shell_install/nushell.rs
@@ -0,0 +1,123 @@
+//! The goal of this mod is to ensure the launcher shell function
+//! is available for nushell i.e. the `br` shell function can
+//! be used to launch broot (and thus make it possible to execute
+//! some commands, like `cd`, from the starting shell.
+//!
+//! In a correct installation, we have:
+//! - a function declaration script in ~/.local/share/broot/launcher/nushell/br/1
+//! - a link to that script in ~/.config/broot/launcher/nushell/br/1
+//! - a line to source the link in ~/.config/nushell/config.nu
+//! (exact paths depend on XDG variables)
+//!
+//! More info at
+//!  https://github.com/Canop/broot/issues/375
+
+use {
+    super::{util, ShellInstall},
+    crate::{
+        conf,
+        errors::*,
+    },
+    directories::BaseDirs,
+    std::path::PathBuf,
+    termimad::{
+        mad_print_inline,
+    },
+};
+
+const NAME: &str = "nushell";
+const VERSION: &str = "1";
+
+const NU_FUNC: &str = r#"
+# This script was automatically generated by the broot program
+# More information can be found in https://github.com/Canop/broot
+# This function starts broot and executes the command
+# it produces, if any.
+# It's needed because some shell commands, like `cd`,
+# have no useful effect if executed in a subshell.
+def _br_cmd [] {
+  let cmd_file = ([ $nu.temp-path, $"broot-(random chars).tmp" ] | path join)
+  touch $cmd_file
+  ^broot --outcmd $cmd_file
+  let target_dir = (open $cmd_file | to text | str replace "^cd\\s+" "" | str trim)
+  rm -p -f $cmd_file
+
+  $target_dir
+}
+alias br = cd (_br_cmd)
+"#;
+
+pub fn get_script() -> &'static str {
+    NU_FUNC
+}
+
+/// return the path to the link to the function script
+fn get_link_path() -> PathBuf {
+    conf::dir().join("launcher").join(NAME).join("br")
+}
+
+/// return the root of
+fn get_nushell_dir() -> Option<PathBuf> {
+    BaseDirs::new()
+        .map(|base_dirs| base_dirs.config_dir().join("nushell"))
+        .filter(|dir| dir.exists())
+}
+
+/// return the path to the script containing the function.
+///
+/// In XDG_DATA_HOME (typically ~/.local/share on linux)
+fn get_script_path() -> PathBuf {
+    conf::app_dirs()
+        .data_dir()
+        .join("launcher")
+        .join(NAME)
+        .join(VERSION)
+}
+
+/// Check for nushell.
+///
+/// Check whether the shell function is installed, install
+/// it if it wasn't refused before or if broot is launched
+/// with --install.
+pub fn install(si: &mut ShellInstall) -> Result<(), ShellInstallError> {
+    debug!("install {NAME}");
+    let Some(nushell_dir) = get_nushell_dir() else {
+        debug!("no nushell config directory. Assuming nushell isn't used.");
+        return Ok(());
+    };
+    info!("nushell seems to be installed");
+    let script_path = get_script_path();
+    si.write_script(&script_path, NU_FUNC)?;
+    let link_path = get_link_path();
+    si.create_link(&link_path, &script_path)?;
+
+    let escaped_path = link_path.to_string_lossy().replace(' ', "\\ ");
+    let source_line = format!("source {}", &escaped_path);
+
+    let sourcing_path = nushell_dir.join("config.nu");
+    if !sourcing_path.exists() {
+        warn!("Unexpected lack of config.nu file");
+        return Ok(());
+    }
+    if sourcing_path.is_dir() {
+        warn!("config.nu file");
+        return Ok(());
+    }
+    let sourcing_path_str = sourcing_path.to_string_lossy();
+    if util::file_contains_line(&sourcing_path, &source_line)? {
+        mad_print_inline!(
+            &si.skin,
+            "`$0` already patched, no change made.\n",
+            &sourcing_path_str,
+        );
+    } else {
+        util::append_to_file(&sourcing_path, format!("\n{source_line}\n"))?;
+        mad_print_inline!(
+            &si.skin,
+            "`$0` successfully patched, you can make the function immediately available with `source $0`\n",
+            &sourcing_path_str,
+        );
+    }
+    si.done = true;
+    Ok(())
+}
diff --git a/src/shell_install/util.rs b/src/shell_install/util.rs
index 13ad5d0..34d11d1 100644
--- a/src/shell_install/util.rs
+++ b/src/shell_install/util.rs
@@ -1,14 +1,30 @@
-use std::{
-    fs,
-    io::{self, BufRead, BufReader},
-    path::Path,
+use {
+    crate::errors::*,
+    std::{
+        fs::{self, OpenOptions},
+        io::{BufRead, BufReader, Write},
+        path::Path,
+    },
 };
-
-pub fn file_contains_line(path: &Path, searched_line: &str) -> io::Result<bool> {
-    for line in BufReader::new(fs::File::open(path)?).lines() {
-        if line? == searched_line {
+pub fn file_contains_line(path: &Path, searched_line: &str) -> Result<bool, ShellInstallError> {
+    let file = fs::File::open(path)
+        .context(&|| format!("opening {path:?}"))?;
+    for line in BufReader::new(file).lines() {
+        let line = line.context(&|| format!("reading line in {path:?}"))?;
+        if line == searched_line {
             return Ok(true);
         }
     }
     Ok(false)
 }
+
+pub fn append_to_file<S: AsRef<str>>(path: &Path, content: S) -> Result<(), ShellInstallError> {
+    let mut shellrc = OpenOptions::new()
+        .write(true)
+        .append(true)
+        .open(path)
+        .context(&|| format!("opening {path:?} for append"))?;
+    shellrc.write_all(content.as_ref().as_bytes())
+        .context(&|| format!("writing in {path:?}"))?;
+    Ok(())
+}
diff --git a/website/broot_theme/css/base.css b/website/broot_theme/css/base.css
index ab8471b..d569453 100644
--- a/website/broot_theme/css/base.css
+++ b/website/broot_theme/css/base.css
@@ -22,7 +22,7 @@ body > .container {
 }
 
 ul.nav .main {
-    font-weight: bold;
+    /*font-weight: bold;*/
 }
 
 .col-md-3 {
@@ -177,7 +177,7 @@ footer {
 .bs-sidebar .nav > .active > a,
 .bs-sidebar .nav > .active:hover > a,
 .bs-sidebar .nav > .active:focus > a {
-    font-weight: bold;
+    /*font-weight: bold;*/
     background-color: transparent;
     border-right: 1px solid;
 }
diff --git a/website/broot_theme/css/bootstrap-custom.min.css b/website/broot_theme/css/bootstrap-custom.min.css
index d85b1dc..a0576ba 100644
--- a/website/broot_theme/css/bootstrap-custom.min.css
+++ b/website/broot_theme/css/bootstrap-custom.min.css
@@ -1 +1 @@
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