Port before_v0.60/math, before_v0.60/parsing and before_v0.60/git (#844)

This PR is part of porting all old scripts #221 and includes a set of
small modules:
- `math`
- `parsing`
- `git`

before_v0.60/git/git_branch_cleanup.nu

@@ -1,4 +0,0 @@
-# Script that remove outdated local branches from a git repo
-# More information on this article https://www.techwatching.dev/posts/cleaning-git-branches
-
-git branch -vl '*/*' | lines | split column " " BranchName Hash Status --collapse-empty | where Status == '[gone]' | each { git branch -D $it.BranchName } 

before_v0.60/maths/math_functions.nu

@@ -1,33 +0,0 @@
-#!/usr/bin/nu
-#
-# BE CAREFUL WITH ROOTS MADE ON BIG NUMBERS (10 digits and more) — the result is rounded so you may get wrong result.
-# just modify the round -p or calculate it manually
-
-#Root with a custom denominator
-def root [ denominator: number, num: number ] {
-	$num ** ( 1 / $denominator ) | math round  -p 10
-}
-
-#Cube root
-def croot [num: number] {
-	$num ** ( 1 / 3 ) | math round -p 10
-}
-
-#Root with a custom scaler and denominator
-def aroot [ scaler: number, denominator: number, num: number ] {
-	$num ** ($scaler / $denominator) | math round -p 10
-}
-
-#calculate delta of the quadratic function
-def delta [ a: number,#x^2 factor
-b: number, #x factor
-c: number #the rest
-] {
-	( $b ** 2 ) - ( 4 * $a * $c)
-}
-
-#Factorial of the given number
-def fact [num: int] {
-	if $num >= 0 { if $num < 2 {$num} {seq 2 $num | math product} } { echo 'Error: can only calculate non-negative integers'}
-}
-

modules/git/git_branch_age.nu

@@ -1,13 +1,13 @@
 # Creates a table listing the branches of a git repository and the day of the last commit
-def "git age" [] {
+export def "git age" [] {
     git branch |
     lines |
-    str substring 2, |
+    str substring 2.. |
     wrap name |
     insert last_commit {
         get name |
         each {
-            git show $it --no-patch --format=%as | str to-datetime
+            git show $in --no-patch --format=%as | into datetime
         }
     } |
     sort-by last_commit

modules/parsing/sample_andres.nu

@@ -5,17 +5,17 @@ def look_for [word] {
     insert comp {
         get shoes_name |
             split row " " |
-            each --numbered {
-        [[idx, loc]; [$it.index, ($it.item | str index-of $word)]]
-        }
+            enumerate | each {
+        [[idx, loc]; [$in.index, ($in.item | str index-of $word)]]
+        } | flatten
     } |
     flatten |
     where comp.loc >= 0 |
     flatten |
-    update idx { $it.idx + 1 } |
+    update idx { $in + 1 } |
     reject name price loc |
     rename nameWords targetWordIndex
 }
 
-look_for "leather" | to json --pretty 4
-look_for "low-top" | to json --pretty 4
+print (look_for "leather" | to json --indent 4)
+print (look_for "low-top" | to json --indent 4)