utils of history with sqlite (nushell#779)

- backup
- restore
- timing
- top

---------

Co-authored-by: nash <[email protected]>

modules/history-utils/mod.nu

@@ -0,0 +1,105 @@
+def quote [...t] {
+    $"'($t | str join '')'"
+}
+
+def flatten_fields [args] {
+    let f = $in | default [] | filter {|x| $x | is-not-empty }
+    let prefix = $args.0
+    let inner = $args.1
+    let outer = $args.2
+    if ($f | is-not-empty) {
+        $f
+        | each {|x|
+            if ($x | describe -d).type == list {
+                $x | str join $inner
+            } else {
+                $x
+            }
+        }
+        | str join $outer
+        | do { (if ($prefix | is-empty) {[$in]} else {[$prefix $in]})}
+    } else { [] }
+}
+
+def sql [q] {
+    [
+        [$q.select   ['select',   ' as ', ', ']]
+        [$q.from     ['from',     ' as ', ' join ']]
+        [$q.where?   ['where',    ' ',    ' and ']]
+        [$q.whereOr? ['or',       ' ',    ' or ']]
+        [$q.groupBy? ['group by', null,   ', ']]
+        [$q.orderBy? ['order by', ' ',    ', ']]
+        [$q.limit?   ['limit',    null,   ' offset ']]
+    ]
+    | each {|x| $x.0 | flatten_fields $x.1 }
+    | flatten
+    | str join ' '
+}
+
+export def 'history timing' [
+    pattern?
+    --exclude(-x): string
+    --num(-n)=10
+    --all(-a)
+] {
+    open $nu.history-path | query db (sql {
+        from: history
+        where: [
+            "cmd not like 'history timing%'"
+            (if ($pattern | is-not-empty) {[cmd like (quote '%' $pattern '%')]})
+            (if ($exclude | is-not-empty) {[cmd not like (quote '%' $exclude '%')]})
+            (if not $all {[cwd = (quote $env.PWD)]})
+        ]
+        orderBy: [[start desc]]
+        select: [
+            [duration_ms duration]
+            [command_line cmd]
+            [start_timestamp start]
+            (if $all {[$"replace\(cwd, '($env.HOME)', '~')" cwd]})
+            [exit_status exit]
+        ]
+        limit: $num
+    })
+    | update duration {|x| $x.duration | default 0 | do { $in * 1_000_000 } | into duration }
+    | update start {|x| $x.start | into int | do { $in * 1_000_000 } | into datetime }
+}
+
+def "nu-complete history dir" [] {
+    open $nu.history-path | query db (sql {
+        select: [cwd ['count(1)' count]]
+        from: history
+        groupBy: [cwd]
+        orderBy: ['count desc']
+        limit: 20
+    })
+    | rename value description
+    | update value {|x| $x.value | str replace $env.HOME '~' }
+}
+
+export def 'history top' [
+    num=10
+    --before (-b): duration
+    --dir (-d)
+    --path(-p): list<string@"nu-complete history dir">
+] {
+    open $nu.history-path | query db (sql {
+        from: history
+        select: [
+            (if $dir {[$"replace\(cwd, '($env.HOME)', '~')" cwd]} else {[command_line cmd]})
+            ['count(1)' count]
+        ]
+        where: [
+            (if ($before | is-not-empty) {
+                let ts = (date now) - $before | into int | do { $in / 1_000_000 }
+                [start_timestamp > $ts]
+            })
+            (if ($path | is-not-empty) {
+                let ps = $path | path expand | each { quote $in } | str join ', '
+                [cwd in '(' $ps  ')']
+            })
+        ]
+        groupBy: [(if $dir {'cwd'} else {'cmd'})]
+        orderBy: [[count desc]]
+        limit: $num
+    })
+}