forgejo/modules/templates/helper.go

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// Copyright 2024 The Forgejo Authors. All rights reserved.
// Copyright 2018 The Gitea Authors. All rights reserved.
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// Copyright 2014 The Gogs Authors. All rights reserved.
// SPDX-License-Identifier: MIT
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package templates
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import (
"fmt"
"html"
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"html/template"
"net/url"
"slices"
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"strings"
"time"
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user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/markup"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/svg"
Use a general Eval function for expressions in templates. (#23927) One of the proposals in #23328 This PR introduces a simple expression calculator (templates/eval/eval.go), it can do basic expression calculations. Many untested template helper functions like `Mul` `Add` can be replaced by this new approach. Then these `Add` / `Mul` / `percentage` / `Subtract` / `DiffStatsWidth` could all use this `Eval`. And it provides enhancements for Golang templates, and improves readability. Some examples: ---- * Before: `{{Add (Mul $glyph.Row 12) 12}}` * After: `{{Eval $glyph.Row "*" 12 "+" 12}}` ---- * Before: `{{if lt (Add $i 1) (len $.Topics)}}` * After: `{{if Eval $i "+" 1 "<" (len $.Topics)}}` ## FAQ ### Why not use an existing expression package? We need a highly customized expression engine: * do the calculation on the fly, without pre-compiling * deal with int/int64/float64 types, to make the result could be used in Golang template. * make the syntax could be used in the Golang template directly * do not introduce too much complex or strange syntax, we just need a simple calculator. * it needs to strictly follow Golang template's behavior, for example, Golang template treats all non-zero values as truth, but many 3rd packages don't do so. ### What's the benefit? * Developers don't need to add more `Add`/`Mul`/`Sub`-like functions, they were getting more and more. Now, only one `Eval` is enough for all cases. * The new code reads better than old `{{Add (Mul $glyph.Row 12) 12}}`, the old one isn't familiar to most procedural programming developers (eg, the Golang expression syntax). * The `Eval` is fully covered by tests, many old `Add`/`Mul`-like functions were never tested. ### The performance? It doesn't use `reflect`, it doesn't need to parse or compile when used in Golang template, the performance is as fast as native Go template. ### Is it too complex? Could it be unstable? The expression calculator program is a common homework for computer science students, and it's widely used as a teaching and practicing purpose for developers. The algorithm is pretty well-known. The behavior can be clearly defined, it is stable.
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"code.gitea.io/gitea/modules/templates/eval"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/services/gitdiff"
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)
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// NewFuncMap returns functions for injecting to templates
func NewFuncMap() template.FuncMap {
return map[string]any{
"ctx": func() any { return nil }, // template context function
"DumpVar": dumpVar,
// -----------------------------------------------------------------
// html/template related functions
"dict": dict, // it's lowercase because this name has been widely used. Our other functions should have uppercase names.
"Eval": Eval,
"SafeHTML": SafeHTML,
"HTMLFormat": HTMLFormat,
"HTMLEscape": HTMLEscape,
"QueryEscape": QueryEscape,
"JSEscape": JSEscapeSafe,
"SanitizeHTML": SanitizeHTML,
"URLJoin": util.URLJoin,
"DotEscape": DotEscape,
"PathEscape": url.PathEscape,
"PathEscapeSegments": util.PathEscapeSegments,
// utils
"StringUtils": NewStringUtils,
"SliceUtils": NewSliceUtils,
"JsonUtils": NewJsonUtils,
// -----------------------------------------------------------------
// svg / avatar / icon / color
"svg": svg.RenderHTML,
"EntryIcon": base.EntryIcon,
"MigrationIcon": MigrationIcon,
"ActionIcon": ActionIcon,
"SortArrow": SortArrow,
"ContrastColor": util.ContrastColor,
// -----------------------------------------------------------------
// time / number / format
"FileSize": FileSizePanic,
"CountFmt": base.FormatNumberSI,
"TimeSince": timeutil.TimeSince,
"TimeSinceUnix": timeutil.TimeSinceUnix,
"DateTime": timeutil.DateTime,
"Sec2Time": util.SecToTime,
"LoadTimes": func(startTime time.Time) string {
return fmt.Sprint(time.Since(startTime).Nanoseconds()/1e6) + "ms"
},
// -----------------------------------------------------------------
// setting
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"AppName": func() string {
return setting.AppName
},
"AppSubUrl": func() string {
return setting.AppSubURL
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},
"AssetUrlPrefix": func() string {
return setting.StaticURLPrefix + "/assets"
},
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"AppUrl": func() string {
// The usage of AppUrl should be avoided as much as possible,
// because the AppURL(ROOT_URL) may not match user's visiting site and the ROOT_URL in app.ini may be incorrect.
// And it's difficult for Gitea to guess absolute URL correctly with zero configuration,
// because Gitea doesn't know whether the scheme is HTTP or HTTPS unless the reverse proxy could tell Gitea.
return setting.AppURL
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},
"AppVer": func() string {
return setting.AppVer
},
"AppDomain": func() string { // documented in mail-templates.md
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return setting.Domain
},
"RepoFlagsEnabled": func() bool {
return setting.Repository.EnableFlags
},
"AssetVersion": func() string {
return setting.AssetVersion
},
"DefaultShowFullName": func() bool {
return setting.UI.DefaultShowFullName
},
"ShowFooterTemplateLoadTime": func() bool {
return setting.Other.ShowFooterTemplateLoadTime
},
"ShowFooterPoweredBy": func() bool {
return setting.Other.ShowFooterPoweredBy
},
"AllowedReactions": func() []string {
return setting.UI.Reactions
},
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"CustomEmojis": func() map[string]string {
return setting.UI.CustomEmojisMap
},
"MetaAuthor": func() string {
return setting.UI.Meta.Author
},
"MetaDescription": func() string {
return setting.UI.Meta.Description
},
"MetaKeywords": func() string {
return setting.UI.Meta.Keywords
},
"EnableTimetracking": func() bool {
return setting.Service.EnableTimetracking
},
"DisableGitHooks": func() bool {
return setting.DisableGitHooks
},
"DisableWebhooks": func() bool {
return setting.DisableWebhooks
},
"DisableImportLocal": func() bool {
return !setting.ImportLocalPaths
},
"ThemeName": func(user *user_model.User) string {
if user == nil || user.Theme == "" {
return setting.UI.DefaultTheme
}
return user.Theme
},
"NotificationSettings": func() map[string]any {
return map[string]any{
"MinTimeout": int(setting.UI.Notification.MinTimeout / time.Millisecond),
"TimeoutStep": int(setting.UI.Notification.TimeoutStep / time.Millisecond),
"MaxTimeout": int(setting.UI.Notification.MaxTimeout / time.Millisecond),
"EventSourceUpdateTime": int(setting.UI.Notification.EventSourceUpdateTime / time.Millisecond),
Use AJAX for notifications table (#10961) * Use AJAX for notifications table Signed-off-by: Andrew Thornton <art27@cantab.net> * move to separate js Signed-off-by: Andrew Thornton <art27@cantab.net> * placate golangci-lint Signed-off-by: Andrew Thornton <art27@cantab.net> * Add autoupdating notification count Signed-off-by: Andrew Thornton <art27@cantab.net> * Fix wipeall Signed-off-by: Andrew Thornton <art27@cantab.net> * placate tests Signed-off-by: Andrew Thornton <art27@cantab.net> * Try hidden Signed-off-by: Andrew Thornton <art27@cantab.net> * Try hide and hidden Signed-off-by: Andrew Thornton <art27@cantab.net> * More auto-update improvements Only run checker on pages that have a count Change starting checker to 10s with a back-off to 60s if there is no change Signed-off-by: Andrew Thornton <art27@cantab.net> * string comparison! Signed-off-by: Andrew Thornton <art27@cantab.net> * as per @silverwind Signed-off-by: Andrew Thornton <art27@cantab.net> * add configurability as per @6543 Signed-off-by: Andrew Thornton <art27@cantab.net> * Add documentation as per @6543 Signed-off-by: Andrew Thornton <art27@cantab.net> * Use CSRF header not query Signed-off-by: Andrew Thornton <art27@cantab.net> * Further JS improvements Fix @etzelia update notification table request Fix @silverwind comments Co-Authored-By: silverwind <me@silverwind.io> Signed-off-by: Andrew Thornton <art27@cantab.net> * Simplify the notification count fns Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: silverwind <me@silverwind.io>
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}
},
"MermaidMaxSourceCharacters": func() int {
return setting.MermaidMaxSourceCharacters
},
"FederationEnabled": func() bool {
return setting.Federation.Enabled
},
Multiple GitGraph improvements: Exclude PR heads, Add branch/PR links, Show only certain branches, (#12766) * Multiple GitGraph improvements. Add backend support for excluding PRs, selecting branches and files. Fix #10327 Signed-off-by: Andrew Thornton <art27@cantab.net> * as per @silverwind Signed-off-by: Andrew Thornton <art27@cantab.net> * as per @silverwind Signed-off-by: Andrew Thornton <art27@cantab.net> * Only show refs in dropdown we display on the graph Signed-off-by: Andrew Thornton <art27@cantab.net> * as per @silverwind Signed-off-by: Andrew Thornton <art27@cantab.net> * use flexbox for ui header Signed-off-by: Andrew Thornton <art27@cantab.net> * Move Hide Pull Request button to the dropdown Signed-off-by: Andrew Thornton <art27@cantab.net> * Add SHA and user pictures Signed-off-by: Andrew Thornton <art27@cantab.net> * fix test Signed-off-by: Andrew Thornton <art27@cantab.net> * fix test 2 Signed-off-by: Andrew Thornton <art27@cantab.net> * fixes * async * more tweaks * use tabs in tmpl Signed-off-by: Andrew Thornton <art27@cantab.net> * remove commented thing Signed-off-by: Andrew Thornton <art27@cantab.net> * fix linting Signed-off-by: Andrew Thornton <art27@cantab.net> * Update web_src/js/features/gitgraph.js Co-authored-by: silverwind <me@silverwind.io> * graph tweaks * more tweaks * add title Signed-off-by: Andrew Thornton <art27@cantab.net> * fix loading indicator z-index and position Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: techknowlogick <techknowlogick@gitea.io> Co-authored-by: Lauris BH <lauris@nix.lv>
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// -----------------------------------------------------------------
// render
"RenderCommitMessage": RenderCommitMessage,
"RenderCommitMessageLinkSubject": RenderCommitMessageLinkSubject,
Multiple GitGraph improvements: Exclude PR heads, Add branch/PR links, Show only certain branches, (#12766) * Multiple GitGraph improvements. Add backend support for excluding PRs, selecting branches and files. Fix #10327 Signed-off-by: Andrew Thornton <art27@cantab.net> * as per @silverwind Signed-off-by: Andrew Thornton <art27@cantab.net> * as per @silverwind Signed-off-by: Andrew Thornton <art27@cantab.net> * Only show refs in dropdown we display on the graph Signed-off-by: Andrew Thornton <art27@cantab.net> * as per @silverwind Signed-off-by: Andrew Thornton <art27@cantab.net> * use flexbox for ui header Signed-off-by: Andrew Thornton <art27@cantab.net> * Move Hide Pull Request button to the dropdown Signed-off-by: Andrew Thornton <art27@cantab.net> * Add SHA and user pictures Signed-off-by: Andrew Thornton <art27@cantab.net> * fix test Signed-off-by: Andrew Thornton <art27@cantab.net> * fix test 2 Signed-off-by: Andrew Thornton <art27@cantab.net> * fixes * async * more tweaks * use tabs in tmpl Signed-off-by: Andrew Thornton <art27@cantab.net> * remove commented thing Signed-off-by: Andrew Thornton <art27@cantab.net> * fix linting Signed-off-by: Andrew Thornton <art27@cantab.net> * Update web_src/js/features/gitgraph.js Co-authored-by: silverwind <me@silverwind.io> * graph tweaks * more tweaks * add title Signed-off-by: Andrew Thornton <art27@cantab.net> * fix loading indicator z-index and position Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: techknowlogick <techknowlogick@gitea.io> Co-authored-by: Lauris BH <lauris@nix.lv>
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"RenderCommitBody": RenderCommitBody,
"RenderCodeBlock": RenderCodeBlock,
"RenderIssueTitle": RenderIssueTitle,
"RenderEmoji": RenderEmoji,
"ReactionToEmoji": ReactionToEmoji,
"RenderMarkdownToHtml": RenderMarkdownToHtml,
"RenderLabel": RenderLabel,
"RenderLabels": RenderLabels,
// -----------------------------------------------------------------
// misc
"ShortSha": base.ShortSha,
"ActionContent2Commits": ActionContent2Commits,
"IsMultilineCommitMessage": IsMultilineCommitMessage,
"CommentMustAsDiff": gitdiff.CommentMustAsDiff,
"MirrorRemoteAddress": mirrorRemoteAddress,
"FilenameIsImage": FilenameIsImage,
"TabSizeClass": TabSizeClass,
}
Use templates for issue e-mail subject and body (#8329) * Add template capability for issue mail subject * Remove test string * Fix trim subject length * Add comment to template and run make fmt * Add information for the template * Rename defaultMailSubject() to fallbackMailSubject() * General rewrite of the mail template code * Fix .Doer name * Use text/template for subject instead of html * Fix subject Re: prefix * Fix mail tests * Fix static templates * [skip ci] Updated translations via Crowdin * Expose db.SetMaxOpenConns and allow non MySQL dbs to set conn pool params (#8528) * Expose db.SetMaxOpenConns and allow other dbs to set their connection params * Add note about port exhaustion Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com> * Prevent .code-view from overriding font on icon fonts (#8614) * Correct some outdated statements in the contributing guidelines (#8612) * More information for drone-cli in CONTRIBUTING.md * Increases the version of drone-cli to 1.2.0 * Adds a note for the Docker Toolbox on Windows Signed-off-by: LukBukkit <luk.bukkit@gmail.com> * Fix the url for the blog repository (now on gitea.com) Signed-off-by: LukBukkit <luk.bukkit@gmail.com> * Remove TrN due to lack of lang context * Redo templates to match previous code * Fix extra character in template * Unify PR & Issue tempaltes, fix format * Remove default subject * Add template tests * Fix template * Remove replaced function * Provide User as models.User for better consistency * Add docs * Fix doc inaccuracies, improve examples * Change mail footer to math AppName * Add test for mail subject/body template separation * Add support for code review comments * Update docs/content/doc/advanced/mail-templates-us.md Co-Authored-By: 6543 <24977596+6543@users.noreply.github.com>
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}
func HTMLFormat(s string, rawArgs ...any) template.HTML {
args := slices.Clone(rawArgs)
for i, v := range args {
switch v := v.(type) {
case nil, bool, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float32, float64, template.HTML:
// for most basic types (including template.HTML which is safe), just do nothing and use it
case string:
args[i] = template.HTMLEscapeString(v)
case fmt.Stringer:
args[i] = template.HTMLEscapeString(v.String())
default:
args[i] = template.HTMLEscapeString(fmt.Sprint(v))
}
}
return template.HTML(fmt.Sprintf(s, args...))
}
// SafeHTML render raw as HTML
func SafeHTML(s any) template.HTML {
switch v := s.(type) {
case string:
return template.HTML(v)
case template.HTML:
return v
}
panic(fmt.Sprintf("unexpected type %T", s))
}
// SanitizeHTML sanitizes the input by pre-defined markdown rules
func SanitizeHTML(s string) template.HTML {
return template.HTML(markup.Sanitize(s))
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}
func HTMLEscape(s any) template.HTML {
switch v := s.(type) {
case string:
return template.HTML(html.EscapeString(v))
case template.HTML:
return v
}
panic(fmt.Sprintf("unexpected type %T", s))
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}
func JSEscapeSafe(s string) template.HTML {
return template.HTML(template.JSEscapeString(s))
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}
func QueryEscape(s string) template.URL {
return template.URL(url.QueryEscape(s))
}
// DotEscape wraps a dots in names with ZWJ [U+200D] in order to prevent autolinkers from detecting these as urls
func DotEscape(raw string) string {
return strings.ReplaceAll(raw, ".", "\u200d.\u200d")
}
Use a general Eval function for expressions in templates. (#23927) One of the proposals in #23328 This PR introduces a simple expression calculator (templates/eval/eval.go), it can do basic expression calculations. Many untested template helper functions like `Mul` `Add` can be replaced by this new approach. Then these `Add` / `Mul` / `percentage` / `Subtract` / `DiffStatsWidth` could all use this `Eval`. And it provides enhancements for Golang templates, and improves readability. Some examples: ---- * Before: `{{Add (Mul $glyph.Row 12) 12}}` * After: `{{Eval $glyph.Row "*" 12 "+" 12}}` ---- * Before: `{{if lt (Add $i 1) (len $.Topics)}}` * After: `{{if Eval $i "+" 1 "<" (len $.Topics)}}` ## FAQ ### Why not use an existing expression package? We need a highly customized expression engine: * do the calculation on the fly, without pre-compiling * deal with int/int64/float64 types, to make the result could be used in Golang template. * make the syntax could be used in the Golang template directly * do not introduce too much complex or strange syntax, we just need a simple calculator. * it needs to strictly follow Golang template's behavior, for example, Golang template treats all non-zero values as truth, but many 3rd packages don't do so. ### What's the benefit? * Developers don't need to add more `Add`/`Mul`/`Sub`-like functions, they were getting more and more. Now, only one `Eval` is enough for all cases. * The new code reads better than old `{{Add (Mul $glyph.Row 12) 12}}`, the old one isn't familiar to most procedural programming developers (eg, the Golang expression syntax). * The `Eval` is fully covered by tests, many old `Add`/`Mul`-like functions were never tested. ### The performance? It doesn't use `reflect`, it doesn't need to parse or compile when used in Golang template, the performance is as fast as native Go template. ### Is it too complex? Could it be unstable? The expression calculator program is a common homework for computer science students, and it's widely used as a teaching and practicing purpose for developers. The algorithm is pretty well-known. The behavior can be clearly defined, it is stable.
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// Eval the expression and return the result, see the comment of eval.Expr for details.
// To use this helper function in templates, pass each token as a separate parameter.
//
// {{ $int64 := Eval $var "+" 1 }}
// {{ $float64 := Eval $var "+" 1.0 }}
//
// Golang's template supports comparable int types, so the int64 result can be used in later statements like {{if lt $int64 10}}
func Eval(tokens ...any) (any, error) {
n, err := eval.Expr(tokens...)
return n.Value, err
}
func FileSizePanic(s int64) string {
panic("Usage of FileSize in templates is deprecated in Forgejo. Locale.TrSize should be used instead.")
}