Allow users to answer e at prompts (#183)

* Allow users to answer e at prompts

* Rename to currently_explaining

* Speeling

* Show options fully in prompt

* Better coloring

src/action/base/move_unpacked_nix.rs

@@ -42,7 +42,7 @@ impl Action for MoveUnpackedNix {
         vec![ActionDescription::new(
             format!("Move the downloaded Nix into `/nix`"),
             vec![format!(
-                "Nix is being downloaded to `{}` and should be in `nix`",
+                "Nix is being downloaded to `{}` and should be in `/nix`",
                 self.src.display(),
             )],
         )]

src/action/common/configure_nix_daemon_service.rs

@@ -61,8 +61,8 @@ impl Action for ConfigureNixDaemonService {
             self.tracing_synopsis(),
             vec![
                 "Run `systemd-tempfiles --create --prefix=/nix/var/nix`".to_string(),
-                "Run `systemctl link {SERVICE_SRC}`".to_string(),
-                "Run `systemctl link {SOCKET_SRC}`".to_string(),
+                format!("Run `systemctl link {SERVICE_SRC}`"),
+                format!("Run `systemctl link {SOCKET_SRC}`"),
                 "Run `systemctl daemon-reload`".to_string(),
             ],
         )]

src/action/common/create_nix_tree.rs

@@ -52,21 +52,17 @@ impl Action for CreateNixTree {
     }
 
     fn execute_description(&self) -> Vec<ActionDescription> {
+        let Self { create_directories } = &self;
+
+        let mut create_directory_descriptions = Vec::new();
+        for create_directory in create_directories {
+            if let Some(val) = create_directory.describe_execute().iter().next() {
+                create_directory_descriptions.push(val.description.clone())
+            }
+        }
         vec![ActionDescription::new(
             self.tracing_synopsis(),
-            vec![
-                format!(
-                    "Nix and the Nix daemon require a Nix Store, which will be stored at `/nix`"
-                ),
-                format!(
-                    "Creates: {}",
-                    PATHS
-                        .iter()
-                        .map(|v| format!("`{v}`"))
-                        .collect::<Vec<_>>()
-                        .join(", ")
-                ),
-            ],
+            create_directory_descriptions,
         )]
     }
 

src/cli/interaction.rs

@@ -3,24 +3,57 @@ use std::io::{stdin, stdout, BufRead, Write};
 use eyre::{eyre, WrapErr};
 use owo_colors::OwoColorize;
 
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum PromptChoice {
+    Yes,
+    No,
+    Explain,
+}
+
 // Do not try to get clever!
 //
 // Mac is extremely janky if you `curl $URL | sudo sh` and the TTY may not be set up right.
 // The below method was adopted from Rustup at https://github.com/rust-lang/rustup/blob/3331f34c01474bf216c99a1b1706725708833de1/src/cli/term2.rs#L37
-pub(crate) async fn confirm(question: impl AsRef<str>, default: bool) -> eyre::Result<bool> {
+pub(crate) async fn prompt(
+    question: impl AsRef<str>,
+    default: PromptChoice,
+    currently_explaining: bool,
+) -> eyre::Result<PromptChoice> {
     let stdout = stdout();
     let mut term =
         term::terminfo::TerminfoTerminal::new(stdout).ok_or(eyre!("Couldn't get terminal"))?;
     let with_confirm = format!(
         "\
         {question}\n\
         \n\
-        {are_you_sure} ({yes}/{no}): \
+        {are_you_sure} ({yes}/{no}{maybe_explain}): \
     ",
         question = question.as_ref(),
         are_you_sure = "Proceed?".bold(),
-        no = if default { "n" } else { "N" }.red(),
-        yes = if default { "Y" } else { "y" }.green(),
+        no = if default == PromptChoice::No {
+            "[N]o"
+        } else {
+            "[n]o"
+        }
+        .red(),
+        yes = if default == PromptChoice::Yes {
+            "[Y]es"
+        } else {
+            "[y]es"
+        }
+        .green(),
+        maybe_explain = if !currently_explaining {
+            format!(
+                "/{}",
+                if default == PromptChoice::Explain {
+                    "[E]xplain"
+                } else {
+                    "[e]xplain"
+                }
+            )
+        } else {
+            "".into()
+        },
     );
 
     term.write_all(with_confirm.as_bytes())?;
@@ -29,10 +62,11 @@ pub(crate) async fn confirm(question: impl AsRef<str>, default: bool) -> eyre::R
     let input = read_line()?;
 
     let r = match &*input.to_lowercase() {
-        "y" | "yes" => true,
-        "n" | "no" => false,
+        "y" | "yes" => PromptChoice::Yes,
+        "n" | "no" => PromptChoice::No,
+        "e" | "explain" => PromptChoice::Explain,
         "" => default,
-        _ => false,
+        _ => PromptChoice::No,
     };
 
     Ok(r)

src/cli/subcommand/install.rs

@@ -6,7 +6,11 @@ use std::{
 
 use crate::{
     action::ActionState,
-    cli::{ensure_root, interaction, signal_channel, CommandExecute},
+    cli::{
+        ensure_root,
+        interaction::{self, PromptChoice},
+        signal_channel, CommandExecute,
+    },
     error::HasExpectedErrors,
     plan::RECEIPT_LOCATION,
     planner::Planner,
@@ -144,15 +148,23 @@ impl CommandExecute for Install {
         };
 
         if !no_confirm {
-            if !interaction::confirm(
-                install_plan
-                    .describe_install(explain)
-                    .map_err(|e| eyre!(e))?,
-                true,
-            )
-            .await?
-            {
-                interaction::clean_exit_with_message("Okay, didn't do anything! Bye!").await;
+            let mut currently_explaining = explain;
+            loop {
+                match interaction::prompt(
+                    install_plan
+                        .describe_install(currently_explaining)
+                        .map_err(|e| eyre!(e))?,
+                    PromptChoice::Yes,
+                    currently_explaining,
+                )
+                .await?
+                {
+                    PromptChoice::Yes => break,
+                    PromptChoice::Explain => currently_explaining = true,
+                    PromptChoice::No => {
+                        interaction::clean_exit_with_message("Okay, didn't do anything! Bye!").await
+                    },
+                }
             }
         }
 
@@ -175,16 +187,26 @@ impl CommandExecute for Install {
                     };
 
                     eprintln!("{}", "Installation failure, offering to revert...".red());
-                    if !interaction::confirm(
-                        install_plan
-                            .describe_uninstall(explain)
-                            .map_err(|e| eyre!(e))?,
-                        true,
-                    )
-                    .await?
-                    {
-                        interaction::clean_exit_with_message("Okay, didn't do anything! Bye!")
-                            .await;
+                    let mut currently_explaining = explain;
+                    loop {
+                        match interaction::prompt(
+                            install_plan
+                                .describe_uninstall(currently_explaining)
+                                .map_err(|e| eyre!(e))?,
+                            PromptChoice::Yes,
+                            currently_explaining,
+                        )
+                        .await?
+                        {
+                            PromptChoice::Yes => break,
+                            PromptChoice::Explain => currently_explaining = true,
+                            PromptChoice::No => {
+                                interaction::clean_exit_with_message(
+                                    "Okay, didn't do anything! Bye!",
+                                )
+                                .await
+                            },
+                        }
                     }
                     let rx2 = tx.subscribe();
                     let res = install_plan.uninstall(rx2).await;

src/cli/subcommand/uninstall.rs

@@ -5,7 +5,7 @@ use std::{
 };
 
 use crate::{
-    cli::{ensure_root, signal_channel},
+    cli::{ensure_root, interaction::PromptChoice, signal_channel},
     error::HasExpectedErrors,
     plan::RECEIPT_LOCATION,
     InstallPlan,
@@ -127,13 +127,22 @@ impl CommandExecute for Uninstall {
         let mut plan: InstallPlan = serde_json::from_str(&install_receipt_string)?;
 
         if !no_confirm {
-            if !interaction::confirm(
-                plan.describe_uninstall(explain).map_err(|e| eyre!(e))?,
-                true,
-            )
-            .await?
-            {
-                interaction::clean_exit_with_message("Okay, didn't do anything! Bye!").await;
+            let mut currently_explaining = explain;
+            loop {
+                match interaction::prompt(
+                    plan.describe_uninstall(currently_explaining)
+                        .map_err(|e| eyre!(e))?,
+                    PromptChoice::Yes,
+                    currently_explaining,
+                )
+                .await?
+                {
+                    PromptChoice::Yes => break,
+                    PromptChoice::Explain => currently_explaining = true,
+                    PromptChoice::No => {
+                        interaction::clean_exit_with_message("Okay, didn't do anything! Bye!").await
+                    },
+                }
             }
         }
 

src/plan.rs

@@ -66,15 +66,10 @@ impl InstallPlan {
             \n\
             {plan_settings}\n\
             \n\
-            The following actions will be taken{maybe_explain}:\n\
+            The following actions will be taken:\n\
             \n\
             {actions}\n\
         ",
-            maybe_explain = if !explain {
-                " (`--explain` for more context)"
-            } else {
-                ""
-            },
             planner = planner.typetag_name(),
             plan_settings = planner
                 .settings()?