Add incr/decr

src/incr.rs

@@ -0,0 +1,44 @@
+use evalexpr::{eval, Value};
+use kakplugin::{get_selections, open_command_fifo, set_selections, KakError, Selection};
+use std::io::Write;
+
+#[derive(clap::StructOpt, Debug)]
+pub struct Options {
+    #[clap(index = 1, help = "Amount to increment/decrement", default_value = "1")]
+    amount: isize,
+}
+
+pub fn incr(options: &Options, should_increment: bool) -> Result<String, KakError> {
+    let mut err_count: usize = 0;
+
+    let selections = get_selections(Some("_"))?;
+
+    set_selections(selections.iter().map(|s| {
+        match eval(&format!(
+            "{s}{}{}",
+            if should_increment { "+" } else { "-" },
+            options.amount
+        )) {
+            Ok(Value::Float(f)) => f.to_string(),
+            Ok(Value::Int(f)) => f.to_string(),
+            Ok(_) => String::from(""),
+            Err(e) => {
+                eprintln!("Error: {:?}", e);
+                err_count = err_count.saturating_add(1);
+                // Set the selection to empty
+                String::from("")
+            }
+        }
+    }))?;
+
+    Ok(if err_count == 0 {
+        format!("{} {} selections by {}",if options.should_increment {"Incr"} else {"Decr"}, selections.len(), options.amount)
+    } else {
+        format!(
+            "{} {} selections by {} ({} errors)",if options.should_increment {"Incr"} else {"Decr"},
+            selections.len().saturating_sub(err_count),
+            options.amount,
+            err_count,
+        )
+    })
+}

src/main.rs

@@ -12,6 +12,7 @@
 
 mod box_;
 mod errors;
+mod incr;
 mod invert;
 mod math_eval;
 mod set;
@@ -62,6 +63,8 @@ enum Commands {
     Stdin(stdin::Options),
     #[clap(about = "Make boxes out of selections", visible_aliases = &["square"])]
     Box_(box_::Options),
+    Decr(incr::Options),
+    Incr(incr::Options),
 }
 
 fn main() {
@@ -111,5 +114,7 @@ fn run() -> Result<String, KakError> {
         // Commands::Xargs(o) => xargs::xargs(o),
         Commands::Stdin(o) => stdin::stdin(o),
         Commands::Box_(o) => box_::box_(o),
+        Commands::Incr(o) => incr::incr(o, true),
+        Commands::Decr(o) => incr::incr(o, false),
     }
 }