feat: `zsh` fast-syntax-highlighting plugin

1 files changed, 66 insertions, 0 deletions

diff --git a/.config/shell/zsh-fast-syntax-highlighting/fast-string-highlight b/.config/shell/zsh-fast-syntax-highlighting/fast-string-highlight
new file mode 100644
index 0000000..dd8eb4f
--- /dev/null
+++ b/.config/shell/zsh-fast-syntax-highlighting/fast-string-highlight
@@ -0,0 +1,66 @@
+# vim:ft=zsh:sw=4:sts=4
+
+#
+# $1 - PREBUFFER
+# $2 - BUFFER
+#
+function -fast-highlight-string-process {
+    emulate -LR zsh
+    setopt extendedglob warncreateglobal typesetsilent
+
+    local -A pos_to_level level_to_pos pair_map final_pairs
+    local input=$1$2 _mybuf=$1$2 __style __quoting
+    integer __idx=0 __pair_idx __level=0 __start __end
+    local -a match mbegin mend
+
+    pair_map=( "(" ")" "{" "}" "[" "]" )
+
+    while [[ $_mybuf = (#b)[^"{}()[]\\\"'"]#((["({[]})\"'"])|[\\](*))(*) ]]; do
+        [[ -n ${match[3]} ]] && {
+            __idx+=${mbegin[1]}
+
+            [[ $__quoting = \' ]] && _mybuf=${match[3]} || { _mybuf=${match[3]:1}; (( ++ __idx )); }
+        } || {
+            __idx+=${mbegin[1]}
+            [[ -z $__quoting && -z ${_FAST_COMPLEX_BRACKETS[(r)$((__idx-${#PREBUFFER}-1))]} ]] && {
+                if [[ ${match[1]} = ["({["] ]]; then
+                    pos_to_level[$__idx]=$(( ++__level ))
+                    level_to_pos[$__level]=$__idx
+                elif [[ ${match[1]} = ["]})"] ]]; then
+                    if (( __level > 0 )); then
+                        __pair_idx=${level_to_pos[$__level]}
+                        pos_to_level[$__idx]=$(( __level -- ))
+                        [[ ${pair_map[${input[__pair_idx]}]} = ${input[__idx]} ]] && {
+                            final_pairs[$__idx]=$__pair_idx
+                            final_pairs[$__pair_idx]=$__idx
+                        }
+                    else
+                        pos_to_level[$__idx]=-1
+                    fi
+                fi
+            }
+
+            [[ ${match[1]} = \" && $__quoting != \' ]] && { [[ $__quoting = '"' ]] && __quoting="" || __quoting='"'; }
+            [[ ${match[1]} = \' && $__quoting != \" ]] && { [[ $__quoting = "'" ]] && __quoting="" || __quoting="'"; }
+
+            _mybuf=${match[4]}
+        }
+    done
+
+    for __idx in ${(k)pos_to_level}; do
+        (( ${+final_pairs[$__idx]} )) && __style=${FAST_THEME_NAME}bracket-level-$(( ( (pos_to_level[$__idx]-1) % 3 ) + 1 )) || __style=${FAST_THEME_NAME}unknown-token
+        (( __start=__idx-${#PREBUFFER}-1, __end=__idx-${#PREBUFFER}, __start >= 0 )) && \
+            reply+=("$__start $__end ${FAST_HIGHLIGHT_STYLES[$__style]}")
+    done
+
+    # If cursor is on a bracket, then highlight corresponding bracket, if any.
+    if [[ $WIDGET != zle-line-finish ]]; then
+        __idx=$(( CURSOR + 1 ))
+        if (( ${+pos_to_level[$__idx]} )) && (( ${+final_pairs[$__idx]} )); then
+            (( __start=final_pairs[$__idx]-${#PREBUFFER}-1, __end=final_pairs[$__idx]-${#PREBUFFER}, __start >= 0 )) && \
+                reply+=("$__start $__end ${FAST_HIGHLIGHT_STYLES[${FAST_THEME_NAME}paired-bracket]}") && \
+                reply+=("$CURSOR $__idx ${FAST_HIGHLIGHT_STYLES[${FAST_THEME_NAME}paired-bracket]}")
+        fi
+    fi
+    return 0
+}