forgejo/templates/repo/diff/stats.tmpl

{{Eval .file.Addition "+" .file.Deletion}}
<span class="diff-stats-bar gt-mx-3" data-tooltip-content="{{ctx.Locale.Tr "repo.diff.stats_desc_file" (Eval .file.Addition "+" .file.Deletion) .file.Addition .file.Deletion | Str2html}}">
	{{/* if the denominator is zero, then the float result is "width: NaNpx", as before, it just works */}}
	<div class="diff-stats-add-bar" style="width: {{Eval 100 "*" .file.Addition "/" "(" .file.Addition "+" .file.Deletion "+" 0.0 ")"}}%"></div>
</span>
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. 2023-04-07 13:25:49 +00:00			`{{Eval .file.Addition "+" .file.Deletion}}`
Always use `ctx.Locale.Tr` inside templates (#27231) 2023-09-25 08:56:50 +00:00			`<span class="diff-stats-bar gt-mx-3" data-tooltip-content="{{ctx.Locale.Tr "repo.diff.stats_desc_file" (Eval .file.Addition "+" .file.Deletion) .file.Addition .file.Deletion \| Str2html}}">`
Group template helper functions, remove `Printf`, improve template error messages (#23982) Follow #23328 Major changes: * Group the function in `templates/help.go` by their purposes. It could make future work easier. * Remove the `Printf` helper function, there is already a builtin `printf`. * Remove `DiffStatsWidth`, replace with `Eval` in template * Rename the `NewTextFuncMap` to `mailSubjectTextFuncMap`, it's for subject text template only, no need to make it support HTML functions. ---- And fine tune template error messages, to make it more friendly to developers and users. ![image](https://user-images.githubusercontent.com/2114189/230714245-4fd202d1-2b25-41b2-8be5-03c5fee45091.png) ![image](https://user-images.githubusercontent.com/2114189/230714277-66783577-2a03-49d5-8e8c-ceba5e07a2d4.png) --------- Co-authored-by: silverwind <me@silverwind.io> 2023-04-08 13:15:22 +00:00			`{{/* if the denominator is zero, then the float result is "width: NaNpx", as before, it just works */}}`
			`<div class="diff-stats-add-bar" style="width: {{Eval 100 "*" .file.Addition "/" "(" .file.Addition "+" .file.Deletion "+" 0.0 ")"}}%"></div>`
Render diff stats server-side (#13579) Eliminates a flash on page load on the diff stat bars. 2020-11-15 23:50:06 +00:00			`</span>`