From bd4bb9a9fbe51451cbfb6f5abd11169809f5d275 Mon Sep 17 00:00:00 2001
From: Jef Roosens <roosensjef@gmail.com>
Date: Thu, 26 May 2022 09:15:49 +0200
Subject: [PATCH 1/2] feat: added cli command for previewing cron schedules

---
 src/console/schedule/schedule.v | 34 +++++++++++++++++++++++++++++++++
 src/main.v                      |  2 ++
 2 files changed, 36 insertions(+)
 create mode 100644 src/console/schedule/schedule.v

diff --git a/src/console/schedule/schedule.v b/src/console/schedule/schedule.v
new file mode 100644
index 0000000..b086b53
--- /dev/null
+++ b/src/console/schedule/schedule.v
@@ -0,0 +1,34 @@
+module schedule
+
+import cli
+import cron.expression { parse_expression }
+
+// cmd returns the cli submodule for previewing a cron schedule.
+pub fn cmd() cli.Command {
+	return cli.Command{
+		name: 'schedule'
+		description: 'Preview the behavior of a cron schedule.'
+		flags: [
+			cli.Flag{
+				name: 'count'
+				description: 'How many scheduled times to show.'
+				flag: cli.FlagType.int
+				default_value: ['5']
+			},
+		]
+		execute: fn (cmd cli.Command) ? {
+			exp := parse_expression(cmd.args.join(' '))?
+
+			mut t := exp.next_from_now()?
+			println(t)
+
+			count := cmd.flags.get_int('count')?
+
+			for _ in 1 .. count {
+				t = exp.next(t)?
+
+				println(t)
+			}
+		}
+	}
+}
diff --git a/src/main.v b/src/main.v
index 6df45dc..885e0f3 100644
--- a/src/main.v
+++ b/src/main.v
@@ -5,6 +5,7 @@ import server
 import cli
 import console.git
 import console.logs
+import console.schedule
 import cron
 
 fn main() {
@@ -27,6 +28,7 @@ fn main() {
 			git.cmd(),
 			cron.cmd(),
 			logs.cmd(),
+			schedule.cmd(),
 		]
 	}
 	app.setup()

From 768da5b7907e27282744aa25946325d7df2d79f8 Mon Sep 17 00:00:00 2001
From: Jef Roosens <roosensjef@gmail.com>
Date: Thu, 26 May 2022 13:34:57 +0200
Subject: [PATCH 2/2] refactor: added CronExpression.next_n function

---
 src/console/schedule/schedule.v  | 12 ++++--------
 src/cron/expression/expression.v | 14 ++++++++++++++
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/src/console/schedule/schedule.v b/src/console/schedule/schedule.v
index b086b53..8fceddd 100644
--- a/src/console/schedule/schedule.v
+++ b/src/console/schedule/schedule.v
@@ -2,11 +2,13 @@ module schedule
 
 import cli
 import cron.expression { parse_expression }
+import time
 
 // cmd returns the cli submodule for previewing a cron schedule.
 pub fn cmd() cli.Command {
 	return cli.Command{
 		name: 'schedule'
+		usage: 'schedule'
 		description: 'Preview the behavior of a cron schedule.'
 		flags: [
 			cli.Flag{
@@ -17,16 +19,10 @@ pub fn cmd() cli.Command {
 			},
 		]
 		execute: fn (cmd cli.Command) ? {
-			exp := parse_expression(cmd.args.join(' '))?
-
-			mut t := exp.next_from_now()?
-			println(t)
-
+			ce := parse_expression(cmd.args.join(' '))?
 			count := cmd.flags.get_int('count')?
 
-			for _ in 1 .. count {
-				t = exp.next(t)?
-
+			for t in ce.next_n(time.now(), count)? {
 				println(t)
 			}
 		}
diff --git a/src/cron/expression/expression.v b/src/cron/expression/expression.v
index 5eae332..17d2dde 100644
--- a/src/cron/expression/expression.v
+++ b/src/cron/expression/expression.v
@@ -121,6 +121,20 @@ pub fn (ce &CronExpression) next_from_now() ?time.Time {
 	return ce.next(time.now())
 }
 
+// next_n returns the n next occurences of the expression, given a starting
+// time.
+pub fn (ce &CronExpression) next_n(ref time.Time, n int) ?[]time.Time {
+	mut times := []time.Time{cap: n}
+
+	times << ce.next(ref)?
+
+	for i in 1 .. n {
+		times << ce.next(times[i - 1])?
+	}
+
+	return times
+}
+
 // parse_range parses a given string into a range of sorted integers, if
 // possible.
 fn parse_range(s string, min int, max int, mut bitv []bool) ? {