100 lines
2.6 KiB
Markdown
100 lines
2.6 KiB
Markdown
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Hacking on zsh-syntax-highlighting itself
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=========================================
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This document includes information for people working on z-sy-h itself: on the
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core driver (`zsh-syntax-highlighting.zsh`), on the highlighters in the
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distribution, and on the test suite. It does not target third-party
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highlighter authors (although they may find it an interesting read).
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The `main` highlighter
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----------------------
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The following function `pz` is useful when working on the `main` highlighting:
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```zsh
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pq() {
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(( $#argv )) || return 0
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print -r -l -- ${(qqqq)argv}
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}
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pz() {
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local arg
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for arg; do
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pq ${(z)arg}
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done
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}
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```
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It prints, for each argument, its token breakdown, similar to how the main
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loop of the `main` highlighter sees it.
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Testing the `brackets` highlighter
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----------------------------------
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Since the test harness empties `ZSH_HIGHLIGHT_STYLES` and the `brackets`
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highlighter interrogates `ZSH_HIGHLIGHT_STYLES` to determine how to highlight,
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tests must set the `bracket-level-#` keys themselves. For example:
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```zsh
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ZSH_HIGHLIGHT_STYLES[bracket-level-1]=
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ZSH_HIGHLIGHT_STYLES[bracket-level-2]=
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BUFFER='echo ({x})'
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expected_region_highlight=(
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"6 6 bracket-level-1" # (
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"7 7 bracket-level-2" # {
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"9 9 bracket-level-2" # }
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"10 10 bracket-level-1" # )
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)
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```
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Testing the `pattern` and `regexp` highlighters
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-----------------------------------------------
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Because the `pattern` and `regexp` highlighters modifies `region_highlight`
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directly instead of using `_zsh_highlight_add_highlight`, the test harness
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cannot get the `ZSH_HIGHLIGHT_STYLES` keys. Therefore, when writing tests, use
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the style itself as third word (cf. the
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[documentation for `expected_region_highlight`](docs/highlighters.md)). For example:
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```zsh
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ZSH_HIGHLIGHT_PATTERNS+=('rm -rf *' 'fg=white,bold,bg=red')
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BUFFER='rm -rf /'
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expected_region_highlight=(
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"1 8 fg=white,bold,bg=red" # rm -rf /
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)
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```
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Memos and commas
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----------------
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We append to `region_highlight` as follows:
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```zsh
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region_highlight+=("$start $end $spec, memo=zsh-syntax-highlighting")
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```
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That comma is required to cause zsh 5.8 and older to ignore the memo without
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ignoring the `$spec`. It's a hack, but given that no further 5.8.x patch
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releases are planned, it's been deemed acceptable. See issue #418 and the
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cross-referenced issues.
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Miscellany
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----------
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If you work on the driver (`zsh-syntax-highlighting.zsh`), you may find the following zstyle useful:
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```zsh
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zstyle ':completion:*:*:*:*:globbed-files' ignored-patterns {'*/',}zsh-syntax-highlighting.plugin.zsh
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```
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IRC channel
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-----------
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We're on #zsh-syntax-highlighting on Libera.Chat.
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