gno.land/p/samcrew/tablesort/v0⧉

1package tablesort23import (4	"net/url"5	"strings"67	"gno.land/p/mason/md/v0"8	"gno.land/p/nt/ufmt/v0"9)1011// Table holds the headings and rows for rendering.12// Each row must have the same number of cells as there are headings.13type Table struct {14	Headings []string   // ["A", "B", "C"]15	Rows     [][]string // [["a1","b1","c1"], ["a2","b2","c2"], ...]16}1718// Render generates a Markdown table from a Table struct with sortable columns based on URL params.19// paramPrefix is an optional prefix for in the URL to identify the tablesort Renders (e.g. "members-").20func Render(u *url.URL, table *Table, paramPrefix string) string {21	direction := ""22	currentHeading := ""23	if h := u.Query().Get(paramPrefix + "sort-asc"); h != "" {24		direction = "asc"25		currentHeading = h26	} else if h := u.Query().Get(paramPrefix + "sort-desc"); h != "" {27		direction = "desc"28		currentHeading = h29	}3031	var sb strings.Builder3233	// Find the index of the column to sort34	colIndex := -135	for i, h := range table.Headings {36		if h == currentHeading {37			colIndex = i38			break39		}40	}4142	// Sort rows if necessary43	if colIndex != -1 {44		SortRows(table.Rows, colIndex, direction == "asc")45	}4647	// Build header48	sb.WriteString(buildHeader(u, table.Headings, currentHeading, direction, paramPrefix))49	sb.WriteString("\n")5051	numCols := len(table.Headings)5253	// Build rows54	for i, row := range table.Rows {55		// Validate row length56		if len(row) != numCols {57			return "tablesort fails: row " + ufmt.Sprintf("%d", i+1) + " has " +58				ufmt.Sprintf("%d", len(row)) + " cells, expected " +59				ufmt.Sprintf("%d", numCols) + ", because there are " + ufmt.Sprintf("%d", numCols) + " columns.\n"60		}6162		sb.WriteString("|")63		for _, cell := range row {64			sb.WriteString(" " + cell + " |")65		}66		sb.WriteString("\n")67	}6869	return sb.String()70}7172// buildHeader builds the Markdown header row with clickable links and arrows73func buildHeader(u *url.URL, headings []string, currentHeading, direction string, paramPrefix string) string {74	var sb strings.Builder75	sb.WriteString("|")76	for _, h := range headings {77		arrow := ""78		if h == currentHeading {79			if direction == "asc" {80				arrow = " ↑"81			} else if direction == "desc" {82				arrow = " ↓"83			}84		}8586		// Build URL for the header link with toggle logic87		newURL := *u88		q := newURL.Query()89		if h == currentHeading {90			// Toggle sort direction91			if direction == "asc" {92				q.Del(paramPrefix + "sort-asc")93				q.Set(paramPrefix+"sort-desc", h)94			} else {95				q.Del(paramPrefix + "sort-desc")96				q.Set(paramPrefix+"sort-asc", h)97			}98		} else {99			// First click defaults to descending100			q.Del(paramPrefix + "sort-asc")101			q.Set(paramPrefix+"sort-desc", h)102		}103		newURL.RawQuery = q.Encode()104		link := md.Link(h+arrow, newURL.String())105		sb.WriteString(" " + link + " |")106	}107108	sb.WriteString("\n|")109	for range headings {110		sb.WriteString(" --- |")111	}112	return sb.String()113}114