Initial commit

Basic commands have been added, but most of the features for this
project are still work in progress.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

12 files changed, 1051 insertions, 0 deletions

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index 0000000..d5d826d
--- /dev/null
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index 0000000..b35c369
--- /dev/null
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+inquire = "0.7.5"
diff --git a/crates/cli/src/init.rs b/crates/cli/src/init.rs
new file mode 100644
index 0000000..7de2e8c
--- /dev/null
+++ b/crates/cli/src/init.rs
@@ -0,0 +1,55 @@
+fn help() {
+    println!("mihi init: Initialize 'mihi' for a given language.\n");
+    println!("usage: mihi init [OPTIONS]\n");
+
+    println!("Options:");
+    println!("   -h, --help\t\tPrint this message.");
+    println!("   -l, --language\tThe language to be used.");
+}
+
+pub fn run(args: Vec<String>) {
+    let mut given_language: Option<String> = None;
+    let mut it = args.into_iter();
+
+    while let Some(arg) = it.next() {
+        match arg.as_str() {
+            "-h" | "--help" => {
+                help();
+                std::process::exit(0);
+            }
+            "-l" | "--language" => match it.next() {
+                Some(lang) => given_language = Some(lang),
+                None => {
+                    println!(
+                        "error: init: you have to provide a value for the '-l/--language' flag"
+                    );
+                    std::process::exit(1);
+                }
+            },
+            _ => {
+                println!("error: init: unknown flag: '{}'", arg.as_str());
+                std::process::exit(1);
+            }
+        }
+    }
+
+    // Assume latin for now. If we support more languages in the future, there
+    // should be a prompt or something.
+    let language = match given_language {
+        Some(lang) => lang,
+        None => String::from("latin"),
+    };
+
+    match init(language) {
+        Ok(_) => {}
+        Err(e) => {
+            println!("error: init: {}", e);
+            std::process::exit(1);
+        }
+    }
+}
+
+fn init(language: String) -> Result<(), String> {
+    mihi::add_language(language)?;
+    mihi::init_database()
+}
diff --git a/crates/cli/src/main.rs b/crates/cli/src/main.rs
new file mode 100644
index 0000000..78d094d
--- /dev/null
+++ b/crates/cli/src/main.rs
@@ -0,0 +1,81 @@
+mod init;
+mod nuke;
+mod run;
+mod words;
+
+/// Version for this program.
+const VERSION: &str = "0.1.0";
+
+fn help() {
+    println!("Self-assessment tool for language learning.\n");
+    println!("usage: mihi [OPTIONS] [COMMAND] [COMMAND OPTIONS]\n");
+
+    println!("Options:");
+    println!("   -h, --help\t\tPrint this message.");
+    println!("   -v, --version\tPrint the version of this program.\n");
+
+    println!("Commands:");
+    println!("   init\t\t\tInitialize the configuration for this application.");
+    println!("   nuke\t\t\tRemove all files from this application and its database.");
+    println!("   run\t\t\tRun exercises. Default command if none was given.");
+    println!("   words\t\tManage the words for this application.");
+}
+
+fn main() {
+    let mut args = std::env::args();
+    let nargs = std::env::args().count();
+    let mut count = 1;
+
+    // Skip command name.
+    args.next();
+
+    // And iterate over the arguments.
+    while let Some(arg) = args.next() {
+        count += 1;
+
+        match arg.as_str() {
+            "-h" | "--help" => {
+                if nargs > count {
+                    println!(
+                        "warning: arguments passed the '{}' flag will be ignored.",
+                        arg.as_str()
+                    );
+                }
+                help();
+                std::process::exit(0);
+            }
+            "-v" | "--version" => {
+                if nargs > count {
+                    println!(
+                        "warning: arguments passed the '{}' flag will be ignored.",
+                        arg.as_str()
+                    );
+                }
+                println!("mihi {}", VERSION);
+                std::process::exit(0);
+            }
+            "init" => {
+                let rest: Vec<String> = args.collect();
+                return init::run(rest);
+            }
+            "nuke" => {
+                let rest: Vec<String> = args.collect();
+                return nuke::run(rest);
+            }
+            "words" => {
+                let rest: Vec<String> = args.collect();
+                return words::run(rest);
+            }
+            "run" => {
+                let rest: Vec<String> = args.collect();
+                return run::run(rest);
+            }
+            _ => {
+                println!("error: unknown flag or command: '{}'", arg.as_str());
+                std::process::exit(1);
+            }
+        }
+    }
+
+    run::run(Vec::new());
+}
diff --git a/crates/cli/src/nuke.rs b/crates/cli/src/nuke.rs
new file mode 100644
index 0000000..1ea6532
--- /dev/null
+++ b/crates/cli/src/nuke.rs
@@ -0,0 +1,36 @@
+fn help() {
+    println!("mihi nuke: Nuke the current installation.\n");
+    println!("usage: mihi nuke [OPTIONS]\n");
+
+    println!("Options:");
+    println!("   -h, --help\t\tPrint this message.");
+}
+
+pub fn run(args: Vec<String>) {
+    for arg in args {
+        match arg.as_str() {
+            "-h" | "--help" => {
+                help();
+                std::process::exit(0);
+            }
+            _ => {
+                println!("error: nuke: unknown flag: '{}'", arg.as_str());
+                std::process::exit(1);
+            }
+        }
+    }
+
+    match mihi::get_config_path() {
+        Ok(path) => match std::fs::remove_dir_all(path) {
+            Ok(_) => {}
+            Err(e) => {
+                println!("error: nuke: {}", e);
+                std::process::exit(1);
+            }
+        },
+        Err(e) => {
+            println!("error: nuke: {}", e);
+            std::process::exit(1);
+        }
+    }
+}
diff --git a/crates/cli/src/run.rs b/crates/cli/src/run.rs
new file mode 100644
index 0000000..2288a17
--- /dev/null
+++ b/crates/cli/src/run.rs
@@ -0,0 +1,3 @@
+pub fn run(args: Vec<String>) {
+    println!("TBD: {:#?}", args);
+}
diff --git a/crates/cli/src/words.rs b/crates/cli/src/words.rs
new file mode 100644
index 0000000..bdf49b5
--- /dev/null
+++ b/crates/cli/src/words.rs
@@ -0,0 +1,141 @@
+use inquire::{Confirm, Select};
+use std::vec::IntoIter;
+
+use mihi::{delete_word, select_enunciated};
+
+fn help() {
+    println!("mihi words: Manage words.\n");
+    println!("usage: mihi words [OPTIONS] <subcommand>\n");
+
+    println!("Options:");
+    println!("   -h, --help\t\tPrint this message.");
+
+    println!("\nSubcommands:");
+    println!("   create\t\tCreate a new word.");
+    println!("   ls\t\t\tList the words from the database.");
+    println!("   rm\t\t\tRemove a word from the database.");
+    println!("   show\t\t\tShow information from a word.");
+}
+
+fn create(args: IntoIter<String>) -> i32 {
+    println!("TBD: {:#?}", args);
+
+    return 0;
+}
+
+fn show(args: IntoIter<String>) -> i32 {
+    println!("TBD: {:#?}", args);
+
+    return 0;
+}
+
+fn ls(mut args: IntoIter<String>) -> i32 {
+    if args.len() > 1 {
+        println!("error: words: too many filters");
+        return 1;
+    }
+
+    let words = match select_enunciated(args.next()) {
+        Ok(words) => words,
+        Err(e) => {
+            println!("error: words: {}", e);
+            return 1;
+        }
+    };
+
+    for enunciated in words {
+        println!("{}", enunciated);
+    }
+
+    return 0;
+}
+
+fn rm(mut args: IntoIter<String>) -> i32 {
+    if args.len() > 1 {
+        println!("error: words: too many filters");
+        return 1;
+    }
+
+    let words = match select_enunciated(args.next()) {
+        Ok(words) => words,
+        Err(e) => {
+            println!("error: words: {}", e);
+            return 1;
+        }
+    };
+
+    let selection: String = match words.len() {
+        0 => {
+            println!("errors: words: not found!");
+            return 1;
+        }
+        1 => words.first().unwrap().to_owned(),
+        _ => match Select::new("Which word?", words).prompt() {
+            Ok(choice) => choice,
+            Err(_) => return 1,
+        },
+    };
+
+    let ans = Confirm::new(
+        format!(
+            "Do you really want to remove '{}' from the database?",
+            selection
+        )
+        .as_str(),
+    )
+    .with_default(true)
+    .prompt();
+
+    match ans {
+        Ok(true) => match delete_word(&selection) {
+            Ok(_) => println!("Removed '{}' from the database!", selection),
+            Err(e) => {
+                println!("error: words: {}", e);
+                return 1;
+            }
+        },
+        Ok(false) => {
+            println!("Doing nothing...");
+        }
+        Err(_) => return 1,
+    }
+
+    return 0;
+}
+
+pub fn run(args: Vec<String>) {
+    if args.is_empty() {
+        println!("error: words: you have to provide at least a subcommand");
+        std::process::exit(1);
+    }
+
+    let mut it = args.into_iter();
+
+    while let Some(first) = it.next() {
+        match first.as_str() {
+            "-h" | "--help" => {
+                help();
+                std::process::exit(0);
+            }
+            "create" => {
+                std::process::exit(create(it));
+            }
+            "ls" => {
+                std::process::exit(ls(it));
+            }
+            "rm" => {
+                std::process::exit(rm(it));
+            }
+            "show" => {
+                std::process::exit(show(it));
+            }
+            _ => {
+                println!(
+                    "error: words: unknown flag or command: '{}'",
+                    first.as_str()
+                );
+                std::process::exit(1);
+            }
+        }
+    }
+}
diff --git a/lib/mihi/Cargo.toml b/lib/mihi/Cargo.toml
new file mode 100644
index 0000000..33f3439
--- /dev/null
+++ b/lib/mihi/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "mihi"
+version = "0.1.0"
+description = "Library for the 'mihi' application"
+
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+rusqlite = { version = "0.35.0", features = ["bundled"] }
diff --git a/lib/mihi/src/lib.rs b/lib/mihi/src/lib.rs
new file mode 100644
index 0000000..906953d
--- /dev/null
+++ b/lib/mihi/src/lib.rs
@@ -0,0 +1,146 @@
+use std::fs;
+use std::fs::File;
+use std::io::prelude::*;
+use std::path::{Path, PathBuf};
+
+use rusqlite::{params, Connection};
+
+mod migrate;
+
+/// Returns the configuration path for the application, and it even creates it
+/// if it doesn't exist already.
+pub fn get_config_path() -> Result<PathBuf, String> {
+    let dir = match &std::env::var("XDG_CONFIG_HOME") {
+        Ok(path) => PathBuf::from(path),
+        Err(_) => match &std::env::var("HOME") {
+            Ok(path) => Path::new(path).join(".config"),
+            Err(_) => {
+                return Err(String::from(
+                    "cannot find a suitable path for the configuration",
+                ))
+            }
+        },
+    }
+    .join("mihi");
+
+    match fs::create_dir_all(&dir) {
+        Ok(_) => {}
+        Err(e) => return Err(e.to_string()),
+    };
+
+    Ok(dir)
+}
+
+/// Add the given language into the configuration of this application.
+pub fn add_language(language: String) -> Result<(), String> {
+    if language.as_str() != "latin" {
+        return Err(String::from("only 'latin' is allowed for a language"));
+    }
+
+    let path = get_config_path()?;
+    let cfg = path.join("languages.txt");
+
+    if cfg.exists() {
+        return Ok(());
+    }
+
+    let mut file = match File::create(cfg) {
+        Ok(f) => f,
+        Err(e) => return Err(format!("could not create file: {}", e)),
+    };
+    match file.write_all(language.as_bytes()) {
+        Ok(_) => Ok(()),
+        Err(e) => Err(format!("could not save language '{}': {}", language, e)),
+    }
+}
+
+/// Ensure that in the config path there is a fully initialized database.
+pub fn init_database() -> Result<(), String> {
+    let path = get_config_path()?.join("database.sqlite3");
+    let conn = match Connection::open(path) {
+        Ok(handle) => handle,
+        Err(e) => {
+            return Err(format!(
+                "could not initialize the database: {}",
+                e.to_string()
+            ))
+        }
+    };
+
+    match migrate::init(conn) {
+        Ok(_) => Ok(()),
+        Err(e) => Err(format!("bad database schema file: {}", e.to_string())),
+    }
+}
+
+// #[derive(Debug)]
+// struct Word {
+//     id: i32,
+//     enunciated: String,
+//     particle: String,
+//     language_id: u64,
+//     declension_id: u64,
+//     conjugation_id: u64,
+//     kind: String,
+//     category: String,
+//     regular: bool,
+//     locative: bool,
+//     gender: u32,
+//     suffix: String,
+//     translation: String,
+//     // TODO: datetime
+//     // TODO: jsonb
+// }
+
+pub fn select_enunciated(filter: Option<String>) -> Result<Vec<String>, String> {
+    let conn = get_connection()?;
+
+    let mut stmt;
+    let mut it = match filter {
+        Some(filter) => {
+            stmt = conn
+                .prepare(
+                    "SELECT enunciated FROM words WHERE enunciated LIKE ('%' || ?1 || '%') ORDER BY enunciated",
+                )
+                .unwrap();
+            stmt.query([filter.as_str()]).unwrap()
+        }
+        None => {
+            stmt = conn
+                .prepare("SELECT enunciated FROM words ORDER BY enunciated")
+                .unwrap();
+            stmt.query([]).unwrap()
+        }
+    };
+
+    let mut res = vec![];
+    while let Some(row) = it.next().unwrap() {
+        res.push(row.get::<usize, String>(0).unwrap());
+    }
+    Ok(res)
+}
+
+pub fn delete_word(enunciated: &String) -> Result<(), String> {
+    let conn = get_connection()?;
+
+    match conn.execute(
+        "DELETE FROM words WHERE enunciated = ?1",
+        params![enunciated.as_str()],
+    ) {
+        Ok(_) => Ok(()),
+        Err(e) => return Err(format!("could not remove '{}': {}", enunciated, e)),
+    }
+}
+
+fn get_connection() -> Result<rusqlite::Connection, String> {
+    let path = get_config_path()?.join("database.sqlite3");
+    match Connection::open(path) {
+        Ok(handle) => Ok(handle),
+        Err(_) => {
+            return Err(
+                "could not fetch the database. Ensure that you have called 'init' first"
+                    .to_string(),
+            )
+        }
+    }
+}
diff --git a/lib/mihi/src/migrate.rs b/lib/mihi/src/migrate.rs
new file mode 100644
index 0000000..48c078e
--- /dev/null
+++ b/lib/mihi/src/migrate.rs
@@ -0,0 +1,42 @@
+use rusqlite::{Connection, Result};
+
+/// Use the given `connection` in order to initialize the database.
+pub fn init(connection: Connection) -> Result<usize> {
+    connection.execute(
+        r#"
+CREATE TABLE IF NOT EXISTS "words" (
+       "id" integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+       "particle" varchar,
+       "enunciated" varchar,
+       "declension_id" integer,
+       "conjugation_id" integer,
+       "kind" varchar,
+       "category" integer,
+       "regular" boolean DEFAULT 1,
+       "locative" boolean DEFAULT 0,
+       "gender" integer,
+       "created_at" datetime(6) NOT NULL,
+       "updated_at" datetime(6) NOT NULL,
+       "last_asked_at" datetime(6) NOT NULL,
+       "suffix" varchar,
+       "language_id" integer,
+       "translation" json,
+       "pending" boolean DEFAULT 0,
+       "flags" jsonb DEFAULT '{}',
+
+       FOREIGN KEY ("conjugation_id") REFERENCES "conjugations" ("id"),
+       FOREIGN KEY ("declension_id") REFERENCES "declensions" ("id")
+);
+"#,
+        (),
+    )?;
+
+    connection.execute(
+        r#"
+CREATE UNIQUE INDEX IF NOT EXISTS "index_words_on_enunciated" ON "words" ("enunciated");
+"#,
+        (),
+    )?;
+
+    Ok(0)
+}