'main': Highlight mismatched 'if'/'fi'.

Also 'then'/'elif'/'else'.

highlighters/main/main-highlighter.zsh

@@ -241,6 +241,8 @@ _zsh_highlight_highlighter_main_paint()
   # "Y" for curly
   # "D" for do/done
   # "$" for 'end' (matches 'foreach' always; also used with cshjunkiequotes in repeat/while)
+  # "?" for 'if'/'fi'; also checked by 'elif'/'else'
+  # ":" for 'then'
   local braces_stack
 
   if (( path_dirs_was_set )); then
@@ -509,6 +511,29 @@ _zsh_highlight_highlighter_main_paint()
                           ('done')
                             _zsh_highlight_main__stack_pop 'D' style=reserved-word
                             ;;
+                          ('if')
+                            braces_stack=':?'"$braces_stack"
+                            ;;
+                          ('then')
+                            _zsh_highlight_main__stack_pop ':' style=reserved-word
+                            ;;
+                          ('elif')
+                            if [[ ${braces_stack[1]} == '?' ]]; then
+                              braces_stack=':'"$braces_stack"
+                            else
+                              style=unknown-token
+                            fi
+                            ;;
+                          ('else')
+                            if [[ ${braces_stack[1]} == '?' ]]; then
+                              :
+                            else
+                              style=unknown-token
+                            fi
+                            ;;
+                          ('fi')
+                            _zsh_highlight_main__stack_pop '?' ""
+                            ;;
                           ('foreach')
                             braces_stack='$'"$braces_stack"
                             ;;

highlighters/main/test-data/brackets-mismatch10-if-negative.zsh

@@ -0,0 +1,42 @@
+#!/usr/bin/env zsh
+# -------------------------------------------------------------------------------------------------
+# Copyright (c) 2017 zsh-syntax-highlighting contributors
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted
+# provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice, this list of conditions
+#    and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright notice, this list of
+#    conditions and the following disclaimer in the documentation and/or other materials provided
+#    with the distribution.
+#  * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
+#    may be used to endorse or promote products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# -------------------------------------------------------------------------------------------------
+# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
+# vim: ft=zsh sw=2 ts=2 et
+# -------------------------------------------------------------------------------------------------
+
+BUFFER='elif true; then echo two; fi'
+
+expected_region_highlight=(
+  '1 4 unknown-token' # elif
+  '6 9 builtin' # true
+  '10 10 commandseparator' # ;
+  '12 15 unknown-token' # then
+  '17 20 builtin' # echo
+  '22 24 default' # two
+  '25 25 commandseparator' # ;
+  '27 28 unknown-token' # fi
+)

highlighters/main/test-data/brackets-mismatch8-if-positive.zsh

@@ -0,0 +1,53 @@
+#!/usr/bin/env zsh
+# -------------------------------------------------------------------------------------------------
+# Copyright (c) 2017 zsh-syntax-highlighting contributors
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted
+# provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice, this list of conditions
+#    and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright notice, this list of
+#    conditions and the following disclaimer in the documentation and/or other materials provided
+#    with the distribution.
+#  * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
+#    may be used to endorse or promote products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# -------------------------------------------------------------------------------------------------
+# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
+# vim: ft=zsh sw=2 ts=2 et
+# -------------------------------------------------------------------------------------------------
+
+BUFFER='if false; then echo one; elif true; then echo two; else echo three; fi'
+
+expected_region_highlight=(
+  '1 2 reserved-word' # if
+  '4 8 builtin' # false
+  '9 9 commandseparator' # ;
+  '11 14 reserved-word' # then
+  '16 19 builtin' # echo
+  '21 23 default' # one
+  '24 24 commandseparator' # ;
+  '26 29 reserved-word' # elif
+  '31 34 builtin' # true
+  '35 35 commandseparator' # ;
+  '37 40 reserved-word' # then
+  '42 45 builtin' # echo
+  '47 49 default' # two
+  '50 50 commandseparator' # ;
+  '52 55 reserved-word' # else
+  '57 60 builtin' # echo
+  '62 66 default' # three
+  '67 67 commandseparator' # ;
+  '69 70 reserved-word' # fi
+)

highlighters/main/test-data/brackets-mismatch9-if-positive.zsh

@@ -0,0 +1,42 @@
+#!/usr/bin/env zsh
+# -------------------------------------------------------------------------------------------------
+# Copyright (c) 2017 zsh-syntax-highlighting contributors
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted
+# provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice, this list of conditions
+#    and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright notice, this list of
+#    conditions and the following disclaimer in the documentation and/or other materials provided
+#    with the distribution.
+#  * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
+#    may be used to endorse or promote products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# -------------------------------------------------------------------------------------------------
+# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
+# vim: ft=zsh sw=2 ts=2 et
+# -------------------------------------------------------------------------------------------------
+
+BUFFER='if false; then echo one; fi'
+
+expected_region_highlight=(
+  '1 2 reserved-word' # if
+  '4 8 builtin' # false
+  '9 9 commandseparator' # ;
+  '11 14 reserved-word' # then
+  '16 19 builtin' # echo
+  '21 23 default' # one
+  '24 24 commandseparator' # ;
+  '26 27 reserved-word' # fi
+)