Add preview window (#28)

Fix #21

navi

@@ -13,9 +13,9 @@ source "${SCRIPT_DIR}/src/main.sh"
 ##? Options:
 ##?     --print                      Prevent script execution [default: false]
 ##?     --no-interpolation           Prevent argument interpolation [default: false]
+##?     --no-preview                 Hide command preview window [default: false]
 
 VERSION="0.6.1"
 docs::eval "$@"
 
-health::fzf
 main "$@"

src/cheat.sh

@@ -27,7 +27,10 @@ cheat::from_selection() {
    for cheat in $cheats; do
       if grep -q "% $tags" "$cheat"; then
          echo "$cheat"
-         break
+         exit 0
       fi
    done
+
+   echoerr "No valid cheatsheet!"
+   exit 67 
 }

src/docs.sh

@@ -9,12 +9,15 @@ docs::extract_help() {
 docs::eval() {
    local wait_for=""
 
+   entry_point="main"
    print=false
    interpolation=true
+   preview=true
 
    for arg in $@; do
       case $wait_for in
          dir) NAVI_DIR="$arg"; wait_for="" ;;
+         command-for) query="$(echo "$arg" | tr "^" " ")"; entry_point="preview"; break ;;
       esac
 
       case $arg in
@@ -22,6 +25,8 @@ docs::eval() {
          --no-interpolation) interpolation=false ;;
          --version) echo "${VERSION:-unknown}" && exit 0 ;;
          --help) docs::extract_help "$0" && exit 0 ;;
+         --command-for) wait_for="command-for" ;;
+         --no-preview) preview=false ;;
          -d|--dir) wait_for="dir" ;;
       esac
    done

src/main.sh

@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-set -euo pipefail
 
 source "${SCRIPT_DIR}/src/arg.sh"
 source "${SCRIPT_DIR}/src/cheat.sh"
@@ -10,10 +9,11 @@ source "${SCRIPT_DIR}/src/selection.sh"
 source "${SCRIPT_DIR}/src/str.sh"
 source "${SCRIPT_DIR}/src/ui.sh"
 
-main() {
+handler::main() {
    local readonly cheats="$(cheat::find)"
    local readonly selection="$(ui::select "$cheats")"
    local readonly cheat="$(cheat::from_selection "$cheats" "$selection")"
+   [ -z "$cheat" ] && exit 67
    local cmd="$(selection::command "$selection" "$cheat")"
    local arg value
 
@@ -41,3 +41,17 @@ main() {
       eval "$cmd"
    fi
 }
+
+handler::preview() {
+   local readonly selection="$(echo "$query" | selection::standardize)"
+   local readonly cheats="$(cheat::find)"
+   local readonly cheat="$(cheat::from_selection "$cheats" "$selection")"
+   [ -n "$cheat" ] && selection::command "$selection" "$cheat"
+}
+
+main() {
+   case ${entry_point:-} in
+      preview) handler::preview "$@" 2>/dev/null || echo "Unable to find command for '${query:-}'";;
+      *) health::fzf && handler::main "$@" ;;
+   esac
+}

src/ui.sh

@@ -6,10 +6,20 @@ ui::pick() {
 
 ui::select() {
    local readonly cheats="$1"
+   local readonly script_path="$(which navi | head -n1 || echo "${SCRIPT_DIR}/navi")"
+   local readonly preview_cmd="echo {} | tr ' ' '^' | xargs -I% \"${script_path}\" --command-for %"
+
+   local args=()
+   args+=("-i")
+   args+=("--ansi")
+   if $preview; then
+      args+=("--preview"); args+=("$preview_cmd")
+      args+=("--preview-window"); args+=("up:1")
+   fi
 
    echo "$cheats" \
       | cheat::read_many \
-      | ui::pick -i --ansi \
+      | ui::pick "${args[@]}" \
       | selection::standardize
 }