fix(complete): Don't cause endless completions for bash/zsh

Reported on #5677

clap_complete/src/command/shells.rs

@@ -187,15 +187,21 @@ impl CommandCompleter for Bash {
 
         let script = r#"
 _clap_complete_NAME() {
-    export IFS=$'\013'
-    export _CLAP_COMPLETE_INDEX=${COMP_CWORD}
-    export _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
+    local IFS=$'\013'
+    local _CLAP_COMPLETE_INDEX=${COMP_CWORD}
+    local _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
     if compopt +o nospace 2> /dev/null; then
-        export _CLAP_COMPLETE_SPACE=false
+        local _CLAP_COMPLETE_SPACE=false
     else
-        export _CLAP_COMPLETE_SPACE=true
+        local _CLAP_COMPLETE_SPACE=true
     fi
-    COMPREPLY=( $("COMPLETER" complete bash -- "${COMP_WORDS[@]}") )
+    COMPREPLY=( $( \
+        IFS="$IFS" \
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" \
+        _CLAP_COMPLETE_COMP_TYPE="$_CLAP_COMPLETE_COMP_TYPE" \
+        _CLAP_COMPLETE_SPACE="$_CLAP_COMPLETE_SPACE" \
+        "COMPLETER" complete bash -- "${COMP_WORDS[@]}" \
+    ) )
     if [[ $? != 0 ]]; then
         unset COMPREPLY
     elif [[ $SUPPRESS_SPACE == 1 ]] && [[ "${COMPREPLY-}" =~ [=/:]$ ]]; then
@@ -471,10 +477,14 @@ impl CommandCompleter for Zsh {
 
         let script = r#"#compdef BIN
 function _clap_dynamic_completer() {
-    export _CLAP_COMPLETE_INDEX=$(expr $CURRENT - 1)
-    export _CLAP_IFS=$'\n'
+    local _CLAP_COMPLETE_INDEX=$(expr $CURRENT - 1)
+    local _CLAP_IFS=$'\n'
 
-    local completions=("${(@f)$(COMPLETER complete zsh -- ${words} 2>/dev/null)}")
+    local completions=("${(@f)$( \
+        _CLAP_IFS="$_CLAP_IFS" \
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" \
+        COMPLETER complete zsh -- ${words} 2>/dev/null \
+    )}")
 
     if [[ -n $completions ]]; then
         compadd -a completions

clap_complete/src/env/shells.rs

@@ -31,16 +31,21 @@ impl EnvCompleter for Bash {
 
         let script = r#"
 _clap_complete_NAME() {
-    export IFS=$'\013'
-    export _CLAP_COMPLETE_INDEX=${COMP_CWORD}
-    export _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
+    local IFS=$'\013'
+    local _CLAP_COMPLETE_INDEX=${COMP_CWORD}
+    local _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
     if compopt +o nospace 2> /dev/null; then
-        export _CLAP_COMPLETE_SPACE=false
+        local _CLAP_COMPLETE_SPACE=false
     else
-        export _CLAP_COMPLETE_SPACE=true
+        local _CLAP_COMPLETE_SPACE=true
     fi
-    export VAR="bash"
-    COMPREPLY=( $("COMPLETER" -- "${COMP_WORDS[@]}") )
+    COMPREPLY=( $( \
+        IFS="$IFS" \
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" \
+        _CLAP_COMPLETE_COMP_TYPE="$_CLAP_COMPLETE_COMP_TYPE" \
+        VAR="bash" \
+        "COMPLETER" -- "${COMP_WORDS[@]}" \
+    ) )
     if [[ $? != 0 ]]; then
         unset COMPREPLY
     elif [[ $SUPPRESS_SPACE == 1 ]] && [[ "${COMPREPLY-}" =~ [=/:]$ ]]; then
@@ -347,11 +352,15 @@ impl EnvCompleter for Zsh {
 
         let script = r#"#compdef BIN
 function _clap_dynamic_completer() {
-    export _CLAP_COMPLETE_INDEX=$(expr $CURRENT - 1)
-    export _CLAP_IFS=$'\n'
-    export VAR="zsh"
+    local _CLAP_COMPLETE_INDEX=$(expr $CURRENT - 1)
+    local _CLAP_IFS=$'\n'
 
-    local completions=("${(@f)$(COMPLETER -- ${words} 2>/dev/null)}")
+    local completions=("${(@f)$( \
+        _CLAP_IFS="$_CLAP_IFS" \
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" \
+        VAR="zsh" \
+        COMPLETER -- ${words} 2>/dev/null \
+    )}")
 
     if [[ -n $completions ]]; then
         compadd -a completions

clap_complete/tests/snapshots/home/dynamic-command/exhaustive/bash/.bashrc

@@ -2,15 +2,21 @@ PS1='% '
 . /etc/bash_completion
 
 _clap_complete_exhaustive() {
-    export IFS=$'\013'
-    export _CLAP_COMPLETE_INDEX=${COMP_CWORD}
-    export _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
+    local IFS=$'\013'
+    local _CLAP_COMPLETE_INDEX=${COMP_CWORD}
+    local _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
     if compopt +o nospace 2> /dev/null; then
-        export _CLAP_COMPLETE_SPACE=false
+        local _CLAP_COMPLETE_SPACE=false
     else
-        export _CLAP_COMPLETE_SPACE=true
+        local _CLAP_COMPLETE_SPACE=true
     fi
-    COMPREPLY=( $("exhaustive" complete bash -- "${COMP_WORDS[@]}") )
+    COMPREPLY=( $( \
+        IFS="$IFS" \
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" \
+        _CLAP_COMPLETE_COMP_TYPE="$_CLAP_COMPLETE_COMP_TYPE" \
+        _CLAP_COMPLETE_SPACE="$_CLAP_COMPLETE_SPACE" \
+        "exhaustive" complete bash -- "${COMP_WORDS[@]}" \
+    ) )
     if [[ $? != 0 ]]; then
         unset COMPREPLY
     elif [[ $SUPPRESS_SPACE == 1 ]] && [[ "${COMPREPLY-}" =~ [=/:]$ ]]; then

clap_complete/tests/snapshots/home/dynamic-command/exhaustive/zsh/zsh/_exhaustive

@@ -1,9 +1,13 @@
 #compdef exhaustive
 function _clap_dynamic_completer() {
-    export _CLAP_COMPLETE_INDEX=$(expr $CURRENT - 1)
-    export _CLAP_IFS=$'\n'
+    local _CLAP_COMPLETE_INDEX=$(expr $CURRENT - 1)
+    local _CLAP_IFS=$'\n'
 
-    local completions=("${(@f)$(exhaustive complete zsh -- ${words} 2>/dev/null)}")
+    local completions=("${(@f)$( \
+        _CLAP_IFS="$_CLAP_IFS" \
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" \
+        exhaustive complete zsh -- ${words} 2>/dev/null \
+    )}")
 
     if [[ -n $completions ]]; then
         compadd -a completions

clap_complete/tests/snapshots/home/dynamic-env/exhaustive/bash/.bashrc

@@ -2,16 +2,21 @@ PS1='% '
 . /etc/bash_completion
 
 _clap_complete_exhaustive() {
-    export IFS=$'\013'
-    export _CLAP_COMPLETE_INDEX=${COMP_CWORD}
-    export _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
+    local IFS=$'\013'
+    local _CLAP_COMPLETE_INDEX=${COMP_CWORD}
+    local _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
     if compopt +o nospace 2> /dev/null; then
-        export _CLAP_COMPLETE_SPACE=false
+        local _CLAP_COMPLETE_SPACE=false
     else
-        export _CLAP_COMPLETE_SPACE=true
+        local _CLAP_COMPLETE_SPACE=true
     fi
-    export COMPLETE="bash"
-    COMPREPLY=( $("exhaustive" -- "${COMP_WORDS[@]}") )
+    COMPREPLY=( $( \
+        IFS="$IFS" \
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" \
+        _CLAP_COMPLETE_COMP_TYPE="$_CLAP_COMPLETE_COMP_TYPE" \
+        COMPLETE="bash" \
+        "exhaustive" -- "${COMP_WORDS[@]}" \
+    ) )
     if [[ $? != 0 ]]; then
         unset COMPREPLY
     elif [[ $SUPPRESS_SPACE == 1 ]] && [[ "${COMPREPLY-}" =~ [=/:]$ ]]; then

clap_complete/tests/snapshots/home/dynamic-env/exhaustive/zsh/zsh/_exhaustive

@@ -1,10 +1,14 @@
 #compdef exhaustive
 function _clap_dynamic_completer() {
-    export _CLAP_COMPLETE_INDEX=$(expr $CURRENT - 1)
-    export _CLAP_IFS=$'\n'
-    export COMPLETE="zsh"
+    local _CLAP_COMPLETE_INDEX=$(expr $CURRENT - 1)
+    local _CLAP_IFS=$'\n'
 
-    local completions=("${(@f)$(exhaustive -- ${words} 2>/dev/null)}")
+    local completions=("${(@f)$( \
+        _CLAP_IFS="$_CLAP_IFS" \
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" \
+        COMPLETE="zsh" \
+        exhaustive -- ${words} 2>/dev/null \
+    )}")
 
     if [[ -n $completions ]]; then
         compadd -a completions

clap_complete/tests/snapshots/register_minimal.bash

@@ -1,14 +1,20 @@
 
 _clap_complete_my_app() {
-    export IFS=$'/013'
-    export _CLAP_COMPLETE_INDEX=${COMP_CWORD}
-    export _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
+    local IFS=$'/013'
+    local _CLAP_COMPLETE_INDEX=${COMP_CWORD}
+    local _CLAP_COMPLETE_COMP_TYPE=${COMP_TYPE}
     if compopt +o nospace 2> /dev/null; then
-        export _CLAP_COMPLETE_SPACE=false
+        local _CLAP_COMPLETE_SPACE=false
     else
-        export _CLAP_COMPLETE_SPACE=true
+        local _CLAP_COMPLETE_SPACE=true
     fi
-    COMPREPLY=( $("my-app" complete bash -- "${COMP_WORDS[@]}") )
+    COMPREPLY=( $( /
+        IFS="$IFS" /
+        _CLAP_COMPLETE_INDEX="$_CLAP_COMPLETE_INDEX" /
+        _CLAP_COMPLETE_COMP_TYPE="$_CLAP_COMPLETE_COMP_TYPE" /
+        _CLAP_COMPLETE_SPACE="$_CLAP_COMPLETE_SPACE" /
+        "my-app" complete bash -- "${COMP_WORDS[@]}" /
+    ) )
     if [[ $? != 0 ]]; then
         unset COMPREPLY
     elif [[ $SUPPRESS_SPACE == 1 ]] && [[ "${COMPREPLY-}" =~ [=/:]$ ]]; then