2 files changed, 140 insertions, 0 deletions
diff --git a/src/backend/bib.rs b/src/backend/bib.rs
new file mode 100644
index 0000000..aa7272f
--- /dev/null
+++ b/src/backend/bib.rs
@@ -0,0 +1,51 @@
+use biblatex::Bibliography;
+use regex::Regex;
+use std::{
+    fs,
+    path::{Path, PathBuf},
+};
+
+use super::cliargs::{CLIArgs, PosArgs};
+
+// Set necessary fields
+// TODO: can surely be made more efficient/simpler
+pub struct Bibi {
+    pub citekeys: Vec<String>,
+    // pub bibliography: Bibliography,
+}
+
+pub fn get_bibfile(filename: impl AsRef<Path>) -> String {
+    let bibfile = fs::read_to_string(&filename).unwrap();
+    bibfile
+}
+
+pub fn get_citekeys(bibstring: &Bibliography) -> Vec<String> {
+    // let bib = Bibliography::parse(&get_bibfile(CLIArgs::parse_cli_args().bibfilearg)).unwrap();
+    // // Define Regex to match citekeys
+    // let re = Regex::new(r"(?m)^\@[a-zA-Z]*\{(.*)\,").unwrap();
+    // // Declare empty vector to fill with captured keys
+    // // Has to be Vec<&str> because of captures_iter method
+    // let mut keys = vec![];
+    // for (_, [key]) in re.captures_iter(&bibfilestring).map(|c| c.extract()) {
+    //     keys.push(key);
+    // }
+    // // Transform Vec<&str> to Vec<String> which is needed by the struct Bibi
+    // let mut citekeys: Vec<String> = keys.into_iter().map(String::from).collect();
+    // // Sort vector items case-insensitive
+    // citekeys.sort_by_key(|name| name.to_lowercase());
+    // citekeys
+    let mut citekeys: Vec<String> = bibstring.iter().map(|entry| entry.to_owned().key).collect();
+    citekeys.sort_by_key(|name| name.to_lowercase());
+    citekeys
+}
+
+impl Bibi {
+    pub fn new() -> Self {
+        // TODO: Needs check for config file path as soon as config file is impl
+        let bib = Bibliography::parse(&get_bibfile(PosArgs::parse_pos_args().bibfilearg)).unwrap();
+        Self {
+            citekeys: get_citekeys(&bib),
+            // bibliography: biblatex::Bibliography::parse(&bibfilestring).unwrap(),
+        }
+    }
+}
diff --git a/src/backend/cliargs.rs b/src/backend/cliargs.rs
new file mode 100644
index 0000000..b820b6a
--- /dev/null
+++ b/src/backend/cliargs.rs
@@ -0,0 +1,89 @@
+use core::panic;
+use std::path::{Path, PathBuf};
+
+use sarge::prelude::*;
+
+sarge! {
+    // Name of the struct
+    ArgumentsCLI,
+
+    // Show help and exit.
+    'h' help: bool,
+
+    // Show version and exit. TODO: Write version...
+    'v' version: bool,
+
+    // Option for file: -b - short option; --bibfile - long option
+    // #ok makes it optional
+    #ok 'b' bibfile: String,
+}
+
+// struct for CLIArgs
+pub struct CLIArgs {
+    pub helparg: bool,
+    pub versionarg: bool,
+}
+
+impl CLIArgs {
+    pub fn parse_cli_args() -> Self {
+        let (cli_args, _) = ArgumentsCLI::parse().expect("Could not parse CLI arguments");
+        Self {
+            helparg: cli_args.help,
+            versionarg: cli_args.version,
+        }
+    }
+}
+
+// Struct for positional arguments
+// TODO: Can surely be improved!!
+pub struct PosArgs {
+    pub bibfilearg: PathBuf,
+}
+
+impl PosArgs {
+    pub fn parse_pos_args() -> Self {
+        let (_, pos_args) = ArgumentsCLI::parse().expect("Could not parse positional arguments");
+        Self {
+            bibfilearg: if pos_args.len() > 1 {
+                PathBuf::from(&pos_args[1])
+                // pos_args[1].to_string()
+            } else {
+                panic!("No path to bibfile provided as argument")
+            }, // bibfilearg: pos_args[1].to_string(),
+        }
+    }
+}
+
+pub fn help_func() -> String {
+    let help = format!(
+        "\
+{} {}
+
+USAGE:
+    bibiman [FLAGS] [file]
+
+POSITIONAL ARGS:
+    <file>    Path to .bib file
+
+FLAGS:
+    -h, --help      Show this help and exit
+    -v, --version   Show the version and exit",
+        env!("CARGO_PKG_NAME"),
+        env!("CARGO_PKG_VERSION"),
+    );
+    help
+}
+
+pub fn version_func() -> String {
+    let version = format!(
+        "\
+{} {}
+{}
+{}",
+        env!("CARGO_PKG_NAME"),
+        env!("CARGO_PKG_VERSION"),
+        env!("CARGO_PKG_AUTHORS"),
+        env!("CARGO_PKG_LICENSE")
+    );
+    version
+}