some work

Cargo.toml

@@ -9,3 +9,6 @@ edition = "2021"
 [[bin]]
 name = "make_prompt"
 path = "src/make_prompt.rs"
+
+[dependencies]
+git2="*"

src/make_prompt.rs

@@ -1,5 +1,7 @@
 use std::fs::File;
 use std::io::Read;
+use std::io::BufReader;
+use std::io::BufRead;
 
 fn fixed_width(input: &String, len: usize) -> String
 {
@@ -11,9 +13,9 @@ fn fixed_width(input: &String, len: usize) -> String
         let cut_to = len - 2_usize;
         let start_from = clen - cut_to;
         let cutted_result = &input[start_from..];
-        let mut result: String = cutted_result.to_owned();
+        let mut result: String = String::from(PLACE_HOLDER);
         
-        result.push_str(&PLACE_HOLDER);
+        result.push_str(&cutted_result);
         return result;
     }
     else
@@ -69,11 +71,107 @@ fn battery_info(width_to: usize) -> String
     }
 }
 
+fn do_get_git_branch(cwd: & std::path::Path) -> String
+{
+    let default = String::from("");
+    match git2::Repository::discover(cwd)
+    {
+        Ok(repo) => {
+            match repo.head() 
+            {
+                Ok(head) => {
+                    match head.shorthand()
+                    {
+                        Some(branch) => String::from(branch),
+                        None => default
+                    }
+                },
+                Err(_) => default
+            }
+        },
+        Err(_) => default
+    }
+}
+fn get_git_branch(cwd: & std::path::Path) -> String
+{
+    format!("✶ {}", do_get_git_branch(cwd))
+}
+
+fn head<T: Read>(from: T, nlines: u64) -> String
+{
+    let mut res = String::new();
+    let mut i = 0;
+    let mut reader = BufReader::new(from);
+    loop
+    {
+        i += 1;
+        if i > nlines 
+        {
+            break;
+        }
+        let mut line = String::new();
+        let _len = reader.read_line(&mut line);
+        res.push_str(& line);
+
+    }
+    res
+}
+
+fn cut_f(input: &String, delimiter: &str, field: u32) -> String
+{
+    let mut i = 1;
+    for fld in input.split(delimiter) 
+    {
+        if i < field
+        {
+            i += 1;
+            continue;
+        }
+        return {
+            if fld.ends_with('\n')
+            {
+                fld[..fld.len() - 1].to_string()
+            }
+            else
+            {
+                fld.to_string()
+            }
+        };
+    }
+    String::from("")
+}
+
+fn get_editor() -> String 
+{
+    match std::env::var("EDITOR")
+    {
+        Ok(editor) => match std::process::Command::new(editor).arg("--version").stdout(std::process::Stdio::piped()).spawn()
+        {
+            Ok(child) => match child.stdout
+            {
+                Some(out) => cut_f(&head(out, 1), "-", 1),
+                None => {eprintln!("editor --version did not give stdout"); String::from("")}
+            },
+            Err(_) => {eprintln!("failed to spawn editor"); String::from("")}
+        },
+        Err(_) => {eprintln!("failed to get $EDITOR"); String::from("")}
+    }
+}
+
+
 fn shell_color_str<T: std::fmt::Display>(string_in: &T, color: &str) -> String
 {
     format!("\x1b[{color}m{string_in}\x1b[00m")
 }
 
+fn getenv(varname: &str) -> String
+{
+    match std::env::var(varname)
+    {
+        Ok(hostname) => hostname,
+        Err(_) => "".to_string()
+    }
+}
 
 fn main()
 {
@@ -115,14 +213,25 @@ fn main()
         }
     };
     
+
     print!("\n");
     {
-        print!("{}{}", shell_color_str(&"┌[", SH_GREEN), battery_info(12));
-        println!("{}", shell_color_str(&"]", SH_GREEN));
+        print!("{}{}", shell_color_str(&"┌[", SH_GREEN)
+                    , battery_info(12));
+        print!("{}{}", shell_color_str(&"|", SH_GREEN)
+                    , fixed_width(&get_git_branch(& std::path::Path::new(&cwd)), 12));
+        print!("{}{}", shell_color_str(&"|", SH_GREEN)
+               , fixed_width(&get_editor(), 10));
+        print!("{}{}", shell_color_str(&"|", SH_GREEN)
+               , fixed_width(lastexit, 4));
+        println!("{}", shell_color_str(&"]┐", SH_GREEN));
     }
     {
-        print!("{}", shell_color_str(&"╞[", SH_GREEN));
-        println!("{}", shell_color_str(&"]", SH_GREEN));
+        print!("{}{}", shell_color_str(&"╞[", SH_GREEN)
+                    , fixed_width(&getenv("HOSTNAME"), 12));
+        print!("{}{}", shell_color_str(&"|", SH_GREEN)
+               , fixed_width(&getenv("USER"), 10));
+        println!("{}", shell_color_str(&"]┘", SH_GREEN));
     }
     {
          print!("{} {}", shell_color_str(&"╞>", SH_GREEN)