shell: replace `which` with `command -v` for speed and POSIX compatibility

https://stackoverflow.com/a/677212/5132088

Signed-off-by: Yury V. Zaytsev <yury@shurup.com>

misc/ext.d/doc.sh.in

@@ -25,9 +25,9 @@ staroffice_console() {
 }
 
 get_ooffice_executable() {
-    if which loffice >/dev/null 2>&1; then
+    if command -v loffice >/dev/null 2>&1; then
         echo "loffice"
-    elif which ooffice >/dev/null 2>&1; then
+    elif command -v ooffice >/dev/null 2>&1; then
         echo "ooffice"
     else
         echo -n
@@ -52,35 +52,35 @@ do_view_action() {
         fi
         ;;
     msdoc)
-        if which wvHtml >/dev/null 2>&1; then
+        if command -v wvHtml >/dev/null 2>&1; then
             tmp=`mktemp -d ${TMPDIR:-/tmp}/%p.XXXXXX`
             wvHtml "${MC_EXT_FILENAME}" --targetdir="$tmp" page.html
             elinks -dump "$tmp/page.html"
             rm -rf "$tmp"
-        elif which antiword >/dev/null 2>&1; then
+        elif command -v antiword >/dev/null 2>&1; then
             antiword -t "${MC_EXT_FILENAME}"
-        elif which catdoc >/dev/null 2>&1; then
+        elif command -v catdoc >/dev/null 2>&1; then
             catdoc -w "${MC_EXT_FILENAME}"
-        elif which word2x >/dev/null 2>&1; then
+        elif command -v word2x >/dev/null 2>&1; then
             word2x -f text "${MC_EXT_FILENAME}" -
         else
             strings "${MC_EXT_FILENAME}"
         fi
         ;;
     msxls)
-        if which xlhtml >/dev/null 2>&1; then
+        if command -v xlhtml >/dev/null 2>&1; then
             tmp=`mktemp -d ${TMPDIR:-/tmp}/%p.XXXXXX`
             xlhtml -a "${MC_EXT_FILENAME}" > "$tmp/page.html"
             elinks -dump "$tmp/page.html"
             rm -rf "$tmp"
-        elif which xls2csv >/dev/null 2>&1; then
+        elif command -v xls2csv >/dev/null 2>&1; then
             xls2csv "${MC_EXT_FILENAME}"
         else
             strings "${MC_EXT_FILENAME}"
         fi
         ;;
     dvi)
-        which dvi2tty >/dev/null 2>&1 && \
+        command -v dvi2tty >/dev/null 2>&1 && \
             dvi2tty "${MC_EXT_FILENAME}" || \
             catdvi "${MC_EXT_FILENAME}"
         ;;

misc/ext.d/image.sh

@@ -18,13 +18,13 @@ do_view_action() {
         [ -n "$DISPLAY" ] && sxpm "${MC_EXT_FILENAME}"
         ;;
     *)
-        if which exif >/dev/null 2>&1; then
+        if command -v exif >/dev/null 2>&1; then
             exif "${MC_EXT_FILENAME}" 2>/dev/null
             E=$?
         else
             E=1
         fi
-        if [ $E != 0 ] && which exiftool >/dev/null 2>&1; then
+        if [ $E != 0 ] && command -v exiftool >/dev/null 2>&1; then
             exiftool "${MC_EXT_FILENAME}" 2>/dev/null
         fi
         identify "${MC_EXT_FILENAME}"
@@ -47,20 +47,20 @@ do_open_action() {
         ;;
     *)
         if [ -n "$DISPLAY" ]; then
-            if which geeqie >/dev/null 2>&1; then
+            if command -v geeqie >/dev/null 2>&1; then
                 (geeqie "${MC_EXT_FILENAME}" &)
             else
                 (gqview "${MC_EXT_FILENAME}" &)
             fi
         # no backgrounding for console viewers
-        elif which fim >/dev/null 2>&1; then
+        elif command -v fim >/dev/null 2>&1; then
             fim "${MC_EXT_FILENAME}"
-        elif which fbi >/dev/null 2>&1; then
+        elif command -v fbi >/dev/null 2>&1; then
             fbi "${MC_EXT_FILENAME}"
-        elif which zgv >/dev/null 2>&1; then
+        elif command -v zgv >/dev/null 2>&1; then
             zgv "${MC_EXT_FILENAME}"
         # run-mailcap as a last resort
-        elif which see >/dev/null 2>&1; then
+        elif command -v see >/dev/null 2>&1; then
             (see "${MC_EXT_FILENAME}" &)
         fi
         ;;

misc/ext.d/misc.sh.in

@@ -13,7 +13,7 @@ do_view_action() {
 
     case "${filetype}" in
     iso9660)
-         if which isoinfo > /dev/null 2>&1; then
+         if command -v isoinfo >/dev/null 2>&1; then
              isoinfo -d -i "${MC_EXT_FILENAME}" && isoinfo -l -R -J -i "${MC_EXT_FILENAME}"
          else
              7za l "${MC_EXT_FILENAME}"
@@ -74,7 +74,7 @@ do_open_action() {
         sqlite3 "${MC_EXT_FILENAME}"
         ;;
     glade)
-        if which glade-3 >/dev/null 2>&1; then
+        if command -v glade-3 >/dev/null 2>&1; then
             (glade-3 "${MC_EXT_FILENAME}" >/dev/null 2>&1 &)
         else
             (glade-2 "${MC_EXT_FILENAME}" >/dev/null 2>&1 &)

misc/ext.d/text.sh.in

@@ -129,7 +129,7 @@ do_open_action() {
         ;;
     chm)
         if [ -n "$DISPLAY" ]; then
-            which kchmviewer > /dev/null 2>&1 \
+            command -v kchmviewer >/dev/null 2>&1 \
                 && (kchmviewer "${MC_EXT_FILENAME}" &) \
                 || (xchm "${MC_EXT_FILENAME}" &)
         else

misc/ext.d/video.sh

@@ -15,10 +15,10 @@ do_view_action() {
 
     case "${filetype}" in
     *)
-        if which mplayer >/dev/null 2>&1; then
+        if command -v mplayer >/dev/null 2>&1; then
             mplayer -identify -vo null -ao null -frames 0 "${MC_EXT_FILENAME}" 2>&1 | \
                 sed -n 's/^ID_//p'
-        elif which mpv_identify.sh >/dev/null 2>&1; then
+        elif command -v mpv_identify.sh >/dev/null 2>&1; then
             mpv_identify.sh "${MC_EXT_FILENAME}"
         else
             echo "Please install either mplayer or mpv to get information for this file"
@@ -30,7 +30,7 @@ do_view_action() {
 do_open_action() {
     filetype=$1
 
-    if which mpv >/dev/null 2>&1; then
+    if command -v mpv >/dev/null 2>&1; then
         PLAYER="mpv --really-quiet"
     else
         PLAYER="mplayer -really-quiet"

src/vfs/extfs/helpers/iso9660.in

@@ -32,7 +32,7 @@
 
 #*** file scope functions **********************************************
 
-XORRISO=$(which xorriso 2>/dev/null)
+XORRISO=$(command -v xorriso >/dev/null 2>&1)
 
 # This snippet is used to undo xorriso's Text_shellsafe(). Pseudocode for the
 # function:
@@ -144,7 +144,7 @@ xorriso_rm() {
 
 # tested to comply with isoinfo 2.0's output
 test_iso () {
-    ISOINFO=$(which isoinfo 2>/dev/null)
+    ISOINFO=$(command -v isoinfo >/dev/null 2>&1)
     if test -z "$ISOINFO"; then
         echo "isoinfo not found" >&2
         return 1

src/vfs/extfs/helpers/u7z

@@ -17,10 +17,10 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-P7ZIP=`which 7z 2>/dev/null` \
-    || P7ZIP=`which 7zz 2>/dev/null` \
-    || P7ZIP=`which 7za 2>/dev/null` \
-    || P7ZIP=`which 7zr 2>/dev/null` \
+P7ZIP=`command -v 7z >/dev/null 2>&1` \
+    || P7ZIP=`command -v 7zz >/dev/null 2>&1` \
+    || P7ZIP=`command -v 7za >/dev/null 2>&1` \
+    || P7ZIP=`command -v 7zr >/dev/null 2>&1` \
     || P7ZIP=""
 
 # Let the test framework hook in:

src/vfs/extfs/helpers/urar.in

@@ -16,7 +16,7 @@
 RAR=rar
 
 # Prefer unrar (freeware).
-UNRAR=`which unrar 2>/dev/null`
+UNRAR=`command -v unrar >/dev/null 2>&1`
 
 [ -z $UNRAR ] && UNRAR=$RAR
 [ ! -x $UNRAR -a -x $RAR ] && UNRAR=$RAR

src/vfs/extfs/helpers/uwim.in

@@ -10,8 +10,8 @@
 # On Debian/Ubuntu wimtools can be installed via:
 # apt install wimtools
 
-which wimlib-imagex 2>/dev/null > /dev/null || exit 1
-WIM=`which wimlib-imagex`
+command -v wimlib-imagex >/dev/null 2>&1 || exit 1
+WIM=`command -v wimlib-imagex >/dev/null 2>&1`
 AWK=@AWK@
 
 [ -n "$2" ] || exit 1