Feature/4661 gantt customize days of weekend

cypress/integration/rendering/gantt.spec.js

@@ -101,12 +101,12 @@ describe('Gantt diagram', () => {
       title Adding GANTT diagram to mermaid
       excludes weekdays 2014-01-10
       todayMarker off
-  
+
       section team's critical event
       deadline A           :milestone, crit, deadlineA, 2024-02-01, 0
       deadline B           :milestone, crit, deadlineB, 2024-02-15, 0
       boss on leave        :bossaway, 2024-01-28, 2024-02-11
-  
+
       section new intern
       onboarding           :onboarding, 2024-01-02, 1w
       literature review    :litreview, 2024-01-02, 10d
@@ -573,7 +573,28 @@ describe('Gantt diagram', () => {
       `
     );
   });
-
+  it('should render a gantt diagram exculding friday and saturday', () => {
+    imgSnapshotTest(
+      `gantt
+      title A Gantt Diagram
+      dateFormat  YYYY-MM-DD
+      excludes weekends
+      weekend friday
+      section Section1
+      A task :a1, 2024-02-28, 10d`
+    );
+  });
+  it('should render a gantt diagram exculding saturday and sunday', () => {
+    imgSnapshotTest(
+      `gantt
+      title A Gantt Diagram
+      dateFormat  YYYY-MM-DD
+      excludes weekends
+      weekend saturday
+      section Section1
+      A task :a1, 2024-02-28, 10d`
+    );
+  });
   it('should render when compact is true', () => {
     imgSnapshotTest(
       `

docs/syntax/gantt.md

@@ -167,6 +167,38 @@ gantt
 
 The `title` is an _optional_ string to be displayed at the top of the Gantt chart to describe the chart as a whole.
 
+### Excludes
+
+The `excludes` is an _optional_ attribute that accepts specific dates in YYYY-MM-DD format, days of the week ("sunday") or "weekends", but not the word "weekdays".
+These date will be marked on the graph, and be excluded from the duration calculation of tasks. Meaning that if there are excluded dates during a task interval, the number of 'skipped' days will be added to the end of the task to ensure the duration is as specified in the code.
+
+#### Weekend (v\<MERMAID_RELEASE_VERSION>+)
+
+When excluding weekends, it is possible to configure the weekends to be either Friday and Saturday or Saturday and Sunday. By default weekends are Saturday and Sunday.
+To define the weekend start day, there is an _optional_ attribute `weekend` that can be added in a new line followed by either `friday` or `saturday`.
+
+```mermaid-example
+gantt
+    title A Gantt Diagram Excluding Fri - Sat weekends
+    dateFormat YYYY-MM-DD
+    excludes weekends
+    weekend friday
+    section Section
+        A task          :a1, 2024-01-01, 30d
+        Another task    :after a1, 20d
+```
+
+```mermaid
+gantt
+    title A Gantt Diagram Excluding Fri - Sat weekends
+    dateFormat YYYY-MM-DD
+    excludes weekends
+    weekend friday
+    section Section
+        A task          :a1, 2024-01-01, 30d
+        Another task    :after a1, 20d
+```
+
 ### Section statements
 
 You can divide the chart into various sections, for example to separate different parts of a project like development and documentation.

packages/mermaid/src/diagrams/gantt/ganttDb.js

@@ -21,6 +21,7 @@
 dayjs.extend(dayjsCustomParseFormat);
 dayjs.extend(dayjsAdvancedFormat);
 
+const WEEKEND_START_DAY = { friday: 5, saturday: 6 };
 let dateFormat = '';
 let axisFormat = '';
 let tickInterval = undefined;
@@ -37,6 +38,7 @@
 let inclusiveEndDates = false;
 let topAxis = false;
 let weekday = 'sunday';
+let weekend = 'saturday';
 
 // The serial order of the task in the script
 let lastOrder = 0;
@@ -63,6 +65,7 @@
   links = {};
   commonClear();
   weekday = 'sunday';
+  weekend = 'saturday';
 };
 
 export const setAxisFormat = function (txt) {
@@ -167,7 +170,11 @@
   if (includes.includes(date.format(dateFormat.trim()))) {
     return false;
   }
-  if (date.isoWeekday() >= 6 && excludes.includes('weekends')) {
+  if (
+    excludes.includes('weekends') &&
+    (date.isoWeekday() == WEEKEND_START_DAY[weekend] ||
+      date.isoWeekday() == WEEKEND_START_DAY[weekend] + 1)
+  ) {
     return true;
   }
   if (excludes.includes(date.format('dddd').toLowerCase())) {
@@ -184,6 +191,14 @@
   return weekday;
 };
 
+export const setWeekend = function (startDay) {
+  weekend = startDay;
+};
+
+export const getWeekend = function () {
+  return weekend;
+};
+
 /**
  * TODO: fully document what this function does and what types it accepts
  *
@@ -781,6 +796,8 @@
   isInvalidDate,
   setWeekday,
   getWeekday,
+  setWeekend,
+  getWeekend,
 };
 
 /**

packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts

@@ -267,6 +267,21 @@ describe('when using the ganttDb', function () {
     expect(tasks[6].task).toEqual('test7');
   });
 
+  it('should ignore weekends starting on friday', function () {
+    ganttDb.setDateFormat('YYYY-MM-DD');
+    ganttDb.setExcludes('weekends');
+    ganttDb.setWeekend('friday');
+    ganttDb.addSection('friday-saturday weekends skip test');
+    ganttDb.addTask('test1', 'id1,2024-02-28, 3d');
+
+    const tasks = ganttDb.getTasks();
+
+    expect(tasks[0].startTime).toEqual(dayjs('2024-02-28', 'YYYY-MM-DD').toDate());
+    expect(tasks[0].endTime).toEqual(dayjs('2024-03-04', 'YYYY-MM-DD').toDate());
+    expect(tasks[0].id).toEqual('id1');
+    expect(tasks[0].task).toEqual('test1');
+  });
+
   it('should maintain the order in which tasks are created', function () {
     ganttDb.setAccTitle('Project Execution');
     ganttDb.setDateFormat('YYYY-MM-DD');

packages/mermaid/src/diagrams/gantt/parser/gantt.jison

@@ -84,6 +84,8 @@ weekday\s+thursday              return 'weekday_thursday'
 weekday\s+friday                return 'weekday_friday'
 weekday\s+saturday              return 'weekday_saturday'
 weekday\s+sunday                return 'weekday_sunday'
+weekend\s+friday                return 'weekend_friday'
+weekend\s+saturday              return 'weekend_saturday'
 \d\d\d\d"-"\d\d"-"\d\d          return 'date';
 "title"\s[^\n]+               return 'title';
 "accDescription"\s[^#\n;]+      return 'accDescription'
@@ -128,6 +130,11 @@ weekday
   | weekday_sunday { yy.setWeekday("sunday");}
   ;
 
+weekend
+  : weekend_friday { yy.setWeekend("friday");}
+  | weekend_saturday { yy.setWeekend("saturday");}
+  ;
+
 statement
   : dateFormat {yy.setDateFormat($1.substr(11));$$=$1.substr(11);}
   | inclusiveEndDates {yy.enableInclusiveEndDates();$$=$1.substr(18);}
@@ -138,6 +145,7 @@ statement
   | includes {yy.setIncludes($1.substr(9));$$=$1.substr(9);}
   | todayMarker {yy.setTodayMarker($1.substr(12));$$=$1.substr(12);}
   | weekday
+  | weekend
   | title {yy.setDiagramTitle($1.substr(6));$$=$1.substr(6);}
   | acc_title acc_title_value { $$=$2.trim();yy.setAccTitle($$); }
   | acc_descr acc_descr_value { $$=$2.trim();yy.setAccDescription($$); }

packages/mermaid/src/docs/syntax/gantt.md

@@ -109,6 +109,27 @@ gantt
 
 The `title` is an _optional_ string to be displayed at the top of the Gantt chart to describe the chart as a whole.
 
+### Excludes
+
+The `excludes` is an _optional_ attribute that accepts specific dates in YYYY-MM-DD format, days of the week ("sunday") or "weekends", but not the word "weekdays".
+These date will be marked on the graph, and be excluded from the duration calculation of tasks. Meaning that if there are excluded dates during a task interval, the number of 'skipped' days will be added to the end of the task to ensure the duration is as specified in the code.
+
+#### Weekend (v\<MERMAID_RELEASE_VERSION>+)
+
+When excluding weekends, it is possible to configure the weekends to be either Friday and Saturday or Saturday and Sunday. By default weekends are Saturday and Sunday.
+To define the weekend start day, there is an _optional_ attribute `weekend` that can be added in a new line followed by either `friday` or `saturday`.
+
+```mermaid-example
+gantt
+    title A Gantt Diagram Excluding Fri - Sat weekends
+    dateFormat YYYY-MM-DD
+    excludes weekends
+    weekend friday
+    section Section
+        A task          :a1, 2024-01-01, 30d
+        Another task    :after a1, 20d
+```
+
 ### Section statements
 
 You can divide the chart into various sections, for example to separate different parts of a project like development and documentation.